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BG | Articles | Volume 15, issue 2
Biogeosciences, 15, 507–527, 2018
https://doi.org/10.5194/bg-15-507-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-15-507-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue: Progress in quantifying ocean biogeochemistry – in honour...
Biogeosciences, 15, 507–527, 2018
https://doi.org/10.5194/bg-15-507-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-15-507-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article 26 Jan 2018
Research article | 26 Jan 2018
Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification
Birgit Gaye et al.
Related authors
Tim Rixen, Greg Cowie, Birgit Gaye, Joaquim Goes, Helga do Rosário Gomes, Raleigh R. Hood, Zouhair Lachkar, Henrike Schmidt, Joachim Segschneider, and Arvind Singh
Biogeosciences, 17, 6051–6080, https://doi.org/10.5194/bg-17-6051-2020, https://doi.org/10.5194/bg-17-6051-2020, 2020
Short summary
Short summary
The northern Indian Ocean hosts an extensive oxygen minimum zone (OMZ), which intensified due to human-induced global changes. This includes the occurrence of anoxic events on the Indian shelf and affects benthic ecosystems and the pelagic ecosystem structure in the Arabian Sea. Consequences for biogeochemical cycles are unknown, which, in addition to the poor representation of mesoscale features, reduces the reliability of predictions of the future OMZ development in the northern Indian Ocean.
Nicole Burdanowitz, Tim Rixen, Birgit Gaye, and Kay-Christian Emeis
Clim. Past Discuss., https://doi.org/10.5194/cp-2020-141, https://doi.org/10.5194/cp-2020-141, 2020
Preprint under review for CP
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To understand the interaction of the Westerlies and Indian Summer Monsoon (ISM) during the Holocene, we used paleoenvironmental reconstructions by using a sediment core from the NE Arabian Sea. We found a climatic transition period between 4.6–3 ka BP during which the ISM shifted southwards and the influence of Westerlies became prominent. Our data indicate a stronger influence of agriculture activities and enhanced soil erosion adding to the impact of Bond events after this transition period.
Natalie C. Harms, Niko Lahajnar, Birgit Gaye, Tim Rixen, Kirstin Dähnke, Markus Ankele, Ulrich Schwarz-Schampera, and Kay-Christian Emeis
Biogeosciences, 16, 2715–2732, https://doi.org/10.5194/bg-16-2715-2019, https://doi.org/10.5194/bg-16-2715-2019, 2019
Short summary
Short summary
The Indian Ocean subtropical gyre is a large oligotrophic area that is likely to adjust to continued warming by increasing stratification, reduced nutrient supply and decreasing biological production. In this study, we investigated concentrations of nutrients and stable isotopes of nitrate. We determine the lateral influence of water masses entering the gyre from the northern Indian Ocean and from the Southern Ocean and quantify the input of nitrogen by N2 fixation into the surface layer.
Tim Rixen, Birgit Gaye, Kay-Christian Emeis, and Venkitasubramani Ramaswamy
Biogeosciences, 16, 485–503, https://doi.org/10.5194/bg-16-485-2019, https://doi.org/10.5194/bg-16-485-2019, 2019
Short summary
Short summary
Data obtained from sediment trap experiments in the Indian Ocean indicate that lithogenic matter ballast increases organic carbon flux rates on average by 45 % and by up to 62 % at trap locations in the river-influenced regions of the Indian Ocean. Such a strong lithogenic matter ballast effect implies that land use changes and the associated enhanced transport of lithogenic matter may significantly affect the CO2 uptake of the organic carbon pump in the receiving ocean areas.
Tim Rixen, Birgit Gaye, Kay-Christian Emeis, and Venkitasubramani Ramaswamy
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-317, https://doi.org/10.5194/bg-2017-317, 2017
Manuscript not accepted for further review
Short summary
Short summary
Sediment trap experiments showed that in the river-influenced regions of the Indian Ocean lithogenic matter supplied from land controls the organic carbon export into the deep sea via its ballast effect in sinking particles. Carbonate produced by plankton is the main ballast material in the open ocean. The ballast effect increases the CO2 uptake of the organic carbon pump by enhancing the amount of nutrients used to bind CO2 and by favouring the sedimentation of organic matter.
T. Rixen, A. Baum, B. Gaye, and B. Nagel
Biogeosciences, 11, 5733–5747, https://doi.org/10.5194/bg-11-5733-2014, https://doi.org/10.5194/bg-11-5733-2014, 2014
B. Gaye, B. Nagel, K. Dähnke, T. Rixen, N. Lahajnar, and K.-C. Emeis
Biogeosciences, 10, 7689–7702, https://doi.org/10.5194/bg-10-7689-2013, https://doi.org/10.5194/bg-10-7689-2013, 2013
Tim Rixen, Greg Cowie, Birgit Gaye, Joaquim Goes, Helga do Rosário Gomes, Raleigh R. Hood, Zouhair Lachkar, Henrike Schmidt, Joachim Segschneider, and Arvind Singh
Biogeosciences, 17, 6051–6080, https://doi.org/10.5194/bg-17-6051-2020, https://doi.org/10.5194/bg-17-6051-2020, 2020
Short summary
Short summary
The northern Indian Ocean hosts an extensive oxygen minimum zone (OMZ), which intensified due to human-induced global changes. This includes the occurrence of anoxic events on the Indian shelf and affects benthic ecosystems and the pelagic ecosystem structure in the Arabian Sea. Consequences for biogeochemical cycles are unknown, which, in addition to the poor representation of mesoscale features, reduces the reliability of predictions of the future OMZ development in the northern Indian Ocean.
Nicole Burdanowitz, Tim Rixen, Birgit Gaye, and Kay-Christian Emeis
Clim. Past Discuss., https://doi.org/10.5194/cp-2020-141, https://doi.org/10.5194/cp-2020-141, 2020
Preprint under review for CP
Short summary
Short summary
To understand the interaction of the Westerlies and Indian Summer Monsoon (ISM) during the Holocene, we used paleoenvironmental reconstructions by using a sediment core from the NE Arabian Sea. We found a climatic transition period between 4.6–3 ka BP during which the ISM shifted southwards and the influence of Westerlies became prominent. Our data indicate a stronger influence of agriculture activities and enhanced soil erosion adding to the impact of Bond events after this transition period.
Nele Tim, Eduardo Zorita, Kay-Christian Emeis, Franziska U. Schwarzkopf, Arne Biastoch, and Birgit Hünicke
Earth Syst. Dynam., 10, 847–858, https://doi.org/10.5194/esd-10-847-2019, https://doi.org/10.5194/esd-10-847-2019, 2019
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Our study reveals that the latitudinal position and intensity of Southern Hemisphere trades and westerlies are correlated. In the last decades the westerlies have shifted poleward and intensified. Furthermore, the latitudinal shifts and intensity of the trades and westerlies impact the sea surface temperatures around southern Africa and in the South Benguela upwelling region. The future development of wind stress depends on the strength of greenhouse gas forcing.
Shan Jiang, Moritz Müller, Jie Jin, Ying Wu, Kun Zhu, Guosen Zhang, Aazani Mujahid, Tim Rixen, Mohd Fakharuddin Muhamad, Edwin Sien Aun Sia, Faddrine Holt Ajon Jang, and Jing Zhang
Biogeosciences, 16, 2821–2836, https://doi.org/10.5194/bg-16-2821-2019, https://doi.org/10.5194/bg-16-2821-2019, 2019
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Three cruises were conducted in the Rajang River estuary, Malaysia. The results revealed that the decomposition of terrestrial organic matter and the subsequent soil leaching were the main sources of dissolved inorganic nitrogen (DIN) in the fresh river water. Porewater exchange and ammonification enhanced DIN concentrations in the estuary water, while intensities of DIN addition varied between seasons. The riverine DIN flux could reach 101.5 ton(N) / d, supporting the coastal primary producers.
Natalie C. Harms, Niko Lahajnar, Birgit Gaye, Tim Rixen, Kirstin Dähnke, Markus Ankele, Ulrich Schwarz-Schampera, and Kay-Christian Emeis
Biogeosciences, 16, 2715–2732, https://doi.org/10.5194/bg-16-2715-2019, https://doi.org/10.5194/bg-16-2715-2019, 2019
Short summary
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The Indian Ocean subtropical gyre is a large oligotrophic area that is likely to adjust to continued warming by increasing stratification, reduced nutrient supply and decreasing biological production. In this study, we investigated concentrations of nutrients and stable isotopes of nitrate. We determine the lateral influence of water masses entering the gyre from the northern Indian Ocean and from the Southern Ocean and quantify the input of nitrogen by N2 fixation into the surface layer.
Malte Heinemann, Joachim Segschneider, and Birgit Schneider
Geosci. Model Dev., 12, 1869–1883, https://doi.org/10.5194/gmd-12-1869-2019, https://doi.org/10.5194/gmd-12-1869-2019, 2019
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Ocean CO2 uptake played a crucial role for the global cooling during ice ages. Dust formation, e.g. by ice scraping over bedrock, potentially contributed to this CO2 uptake because (1) the iron in the dust is a fertilizer and (2) the heavy dust particles can accelerate sinking organic matter (ballasting hypothesis). This study tests the glacial dust ballasting hypothesis for the first time, using an ocean model. It turns out, however, that the ballasting effect probably played a minor role.
Tim Rixen, Birgit Gaye, Kay-Christian Emeis, and Venkitasubramani Ramaswamy
Biogeosciences, 16, 485–503, https://doi.org/10.5194/bg-16-485-2019, https://doi.org/10.5194/bg-16-485-2019, 2019
Short summary
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Data obtained from sediment trap experiments in the Indian Ocean indicate that lithogenic matter ballast increases organic carbon flux rates on average by 45 % and by up to 62 % at trap locations in the river-influenced regions of the Indian Ocean. Such a strong lithogenic matter ballast effect implies that land use changes and the associated enhanced transport of lithogenic matter may significantly affect the CO2 uptake of the organic carbon pump in the receiving ocean areas.
Denise Müller-Dum, Thorsten Warneke, Tim Rixen, Moritz Müller, Antje Baum, Aliki Christodoulou, Joanne Oakes, Bradley D. Eyre, and Justus Notholt
Biogeosciences, 16, 17–32, https://doi.org/10.5194/bg-16-17-2019, https://doi.org/10.5194/bg-16-17-2019, 2019
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Southeast Asian peat-draining rivers are potentially strong sources of carbon to the atmosphere due to the large amounts of organic carbon stored in those ecosystems. We present the first assessment of CO2 emissions from the Rajang River, the largest peat-draining river in Malaysia. The peatlands’ influence on the CO2 emissions from the Rajang River was smaller than expected, probably due to their proximity to the coast. Therefore, the Rajang was only a moderate source of CO2 to the atmosphere.
Joachim Segschneider, Birgit Schneider, and Vyacheslav Khon
Biogeosciences, 15, 3243–3266, https://doi.org/10.5194/bg-15-3243-2018, https://doi.org/10.5194/bg-15-3243-2018, 2018
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To gain a better understanding of climate and marine biogeochemistry variations over the last 9500 years (the Holocene), we performed non-accelerated model simulations with a global coupled climate and biogeochemistry model forced by orbital parameters and atmospheric greenhouse gases. One main outcome is an increase in the volume of the eastern equatorial Pacific oxygen minimum zone, driven by a slowdown of the large-scale circulation.
Celeste Sánchez-Noguera, Ines Stuhldreier, Jorge Cortés, Carlos Jiménez, Álvaro Morales, Christian Wild, and Tim Rixen
Biogeosciences, 15, 2349–2360, https://doi.org/10.5194/bg-15-2349-2018, https://doi.org/10.5194/bg-15-2349-2018, 2018
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The Papagayo upwelling system is a natural laboratory for studying ecosystems' response to ocean acidification (OA). We measured pH and pCO2 in situ with high temporal resolution and compared them with data available from upwelling season. Local coral reefs are exposed to acidic and undersaturated waters in upwelling and non-upwelling events. These restrictive conditions occur alongside local stressors, potentially decreasing reefs' resilience and increasing their vulnerability under future OA.
Valerie Menke, Werner Ehrmann, Yvonne Milker, Swaantje Brzelinski, Jürgen Möbius, Uwe Mikolajewicz, Bernd Zolitschka, Karin Zonneveld, Kay Christian Emeis, and Gerhard Schmiedl
Clim. Past Discuss., https://doi.org/10.5194/cp-2017-139, https://doi.org/10.5194/cp-2017-139, 2017
Preprint withdrawn
Short summary
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This study examines changes in the marine ecosystem during the past 1300 years in the Gulf of Taranto (Italy) to unravel natural and anthropogenic forcing. Our data suggest, that processes at the sea floor are linked to the North Atlantic Oscillation (NAO) and the Atlantic Multidecadal Oscillation. During the past 200 years, the effects of rising northern hemisphere temperature and increasing anthropogenic activity enhanced nutrient and organic matter fluxes leading to more eutrophic conditions.
Tim Rixen, Birgit Gaye, Kay-Christian Emeis, and Venkitasubramani Ramaswamy
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-317, https://doi.org/10.5194/bg-2017-317, 2017
Manuscript not accepted for further review
Short summary
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Sediment trap experiments showed that in the river-influenced regions of the Indian Ocean lithogenic matter supplied from land controls the organic carbon export into the deep sea via its ballast effect in sinking particles. Carbonate produced by plankton is the main ballast material in the open ocean. The ballast effect increases the CO2 uptake of the organic carbon pump by enhancing the amount of nutrients used to bind CO2 and by favouring the sedimentation of organic matter.
Philipp M. Munz, Stephan Steinke, Anna Böll, Andreas Lückge, Jeroen Groeneveld, Michal Kucera, and Hartmut Schulz
Clim. Past, 13, 491–509, https://doi.org/10.5194/cp-13-491-2017, https://doi.org/10.5194/cp-13-491-2017, 2017
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We present the results of several independent proxies of summer SST and upwelling SST from the Oman margin indicative of monsoon strength during the early Holocene. In combination with indices of carbonate preservation and bottom water redox conditions, we demonstrate that a persistent solar influence was modulating summer monsoon intensity. Furthermore, bottom water conditions are linked to atmospheric forcing, rather than changes of intermediate water masses.
Roland Séférian, Marion Gehlen, Laurent Bopp, Laure Resplandy, James C. Orr, Olivier Marti, John P. Dunne, James R. Christian, Scott C. Doney, Tatiana Ilyina, Keith Lindsay, Paul R. Halloran, Christoph Heinze, Joachim Segschneider, Jerry Tjiputra, Olivier Aumont, and Anastasia Romanou
Geosci. Model Dev., 9, 1827–1851, https://doi.org/10.5194/gmd-9-1827-2016, https://doi.org/10.5194/gmd-9-1827-2016, 2016
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This paper explores how the large diversity in spin-up protocols used for ocean biogeochemistry in CMIP5 models contributed to inter-model differences in modeled fields. We show that a link between spin-up duration and skill-score metrics emerges from both individual IPSL-CM5A-LR's results and an ensemble of CMIP5 models. Our study suggests that differences in spin-up protocols constitute a source of inter-model uncertainty which would require more attention in future intercomparison exercises.
Denise Müller, Hermann W. Bange, Thorsten Warneke, Tim Rixen, Moritz Müller, Aazani Mujahid, and Justus Notholt
Biogeosciences, 13, 2415–2428, https://doi.org/10.5194/bg-13-2415-2016, https://doi.org/10.5194/bg-13-2415-2016, 2016
Short summary
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Estuaries act as sources of the greenhouse gases nitrous oxide (N2O) and methane (CH4) to the atmosphere. We provide first measurements of N2O and CH4 in two estuaries in north-western Borneo, a region which is dominated by peatlands. We show that N2O and CH4 concentrations in these estuaries are moderate despite high organic carbon loads, that nutrient enhancement does not lead to enhanced N2O emissions, and that the wet season dominates the variability of the emissions in these systems.
D. Müller, T. Warneke, T. Rixen, M. Müller, A. Mujahid, H. W. Bange, and J. Notholt
Biogeosciences, 13, 691–705, https://doi.org/10.5194/bg-13-691-2016, https://doi.org/10.5194/bg-13-691-2016, 2016
Short summary
Short summary
We studied organic carbon and the dissolved greenhouse gases carbon dioxide (CO2) and carbon monoxide (CO) in two estuaries in Sarawak, Malaysia, whose coast is covered by carbon-rich peatlands. The estuaries received terrestrial organic carbon from peat-draining tributaries. A large fraction was converted to CO2 and a minor fraction to CO. Both gases were released to the atmosphere. This shows how these estuaries function as efficient filters between land and ocean in this important region.
D. Müller, T. Warneke, T. Rixen, M. Müller, S. Jamahari, N. Denis, A. Mujahid, and J. Notholt
Biogeosciences, 12, 5967–5979, https://doi.org/10.5194/bg-12-5967-2015, https://doi.org/10.5194/bg-12-5967-2015, 2015
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Tropical peatlands are an important source of organic carbon to rivers. However, due to the remoteness of these ecosystems, data are scarce. We present the first combined assessment of both lateral organic carbon fluxes and CO2 emissions from an undisturbed tropical peat-draining river. Compared to the organic carbon concentrations, CO2 fluxes to the atmosphere were actually relatively moderate, which we attributed to the short water residence time.
C. Le Quéré, R. Moriarty, R. M. Andrew, G. P. Peters, P. Ciais, P. Friedlingstein, S. D. Jones, S. Sitch, P. Tans, A. Arneth, T. A. Boden, L. Bopp, Y. Bozec, J. G. Canadell, L. P. Chini, F. Chevallier, C. E. Cosca, I. Harris, M. Hoppema, R. A. Houghton, J. I. House, A. K. Jain, T. Johannessen, E. Kato, R. F. Keeling, V. Kitidis, K. Klein Goldewijk, C. Koven, C. S. Landa, P. Landschützer, A. Lenton, I. D. Lima, G. Marland, J. T. Mathis, N. Metzl, Y. Nojiri, A. Olsen, T. Ono, S. Peng, W. Peters, B. Pfeil, B. Poulter, M. R. Raupach, P. Regnier, C. Rödenbeck, S. Saito, J. E. Salisbury, U. Schuster, J. Schwinger, R. Séférian, J. Segschneider, T. Steinhoff, B. D. Stocker, A. J. Sutton, T. Takahashi, B. Tilbrook, G. R. van der Werf, N. Viovy, Y.-P. Wang, R. Wanninkhof, A. Wiltshire, and N. Zeng
Earth Syst. Sci. Data, 7, 47–85, https://doi.org/10.5194/essd-7-47-2015, https://doi.org/10.5194/essd-7-47-2015, 2015
Short summary
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Carbon dioxide (CO2) emissions from human activities (burning fossil fuels and cement production, deforestation and other land-use change) are set to rise again in 2014.
This study (updated yearly) makes an accurate assessment of anthropogenic CO2 emissions and their redistribution between the atmosphere, ocean, and terrestrial biosphere in order to better understand the global carbon cycle, support the development of climate policies, and project future climate change.
T. Rixen, A. Baum, B. Gaye, and B. Nagel
Biogeosciences, 11, 5733–5747, https://doi.org/10.5194/bg-11-5733-2014, https://doi.org/10.5194/bg-11-5733-2014, 2014
W. Koeve, O. Duteil, A. Oschlies, P. Kähler, and J. Segschneider
Geosci. Model Dev., 7, 2393–2408, https://doi.org/10.5194/gmd-7-2393-2014, https://doi.org/10.5194/gmd-7-2393-2014, 2014
C. Le Quéré, G. P. Peters, R. J. Andres, R. M. Andrew, T. A. Boden, P. Ciais, P. Friedlingstein, R. A. Houghton, G. Marland, R. Moriarty, S. Sitch, P. Tans, A. Arneth, A. Arvanitis, D. C. E. Bakker, L. Bopp, J. G. Canadell, L. P. Chini, S. C. Doney, A. Harper, I. Harris, J. I. House, A. K. Jain, S. D. Jones, E. Kato, R. F. Keeling, K. Klein Goldewijk, A. Körtzinger, C. Koven, N. Lefèvre, F. Maignan, A. Omar, T. Ono, G.-H. Park, B. Pfeil, B. Poulter, M. R. Raupach, P. Regnier, C. Rödenbeck, S. Saito, J. Schwinger, J. Segschneider, B. D. Stocker, T. Takahashi, B. Tilbrook, S. van Heuven, N. Viovy, R. Wanninkhof, A. Wiltshire, and S. Zaehle
Earth Syst. Sci. Data, 6, 235–263, https://doi.org/10.5194/essd-6-235-2014, https://doi.org/10.5194/essd-6-235-2014, 2014
A. Flohr, A. K. van der Plas, K.-C. Emeis, V. Mohrholz, and T. Rixen
Biogeosciences, 11, 885–897, https://doi.org/10.5194/bg-11-885-2014, https://doi.org/10.5194/bg-11-885-2014, 2014
B. Gaye, B. Nagel, K. Dähnke, T. Rixen, N. Lahajnar, and K.-C. Emeis
Biogeosciences, 10, 7689–7702, https://doi.org/10.5194/bg-10-7689-2013, https://doi.org/10.5194/bg-10-7689-2013, 2013
V. Cocco, F. Joos, M. Steinacher, T. L. Frölicher, L. Bopp, J. Dunne, M. Gehlen, C. Heinze, J. Orr, A. Oschlies, B. Schneider, J. Segschneider, and J. Tjiputra
Biogeosciences, 10, 1849–1868, https://doi.org/10.5194/bg-10-1849-2013, https://doi.org/10.5194/bg-10-1849-2013, 2013
F. Joos, R. Roth, J. S. Fuglestvedt, G. P. Peters, I. G. Enting, W. von Bloh, V. Brovkin, E. J. Burke, M. Eby, N. R. Edwards, T. Friedrich, T. L. Frölicher, P. R. Halloran, P. B. Holden, C. Jones, T. Kleinen, F. T. Mackenzie, K. Matsumoto, M. Meinshausen, G.-K. Plattner, A. Reisinger, J. Segschneider, G. Shaffer, M. Steinacher, K. Strassmann, K. Tanaka, A. Timmermann, and A. J. Weaver
Atmos. Chem. Phys., 13, 2793–2825, https://doi.org/10.5194/acp-13-2793-2013, https://doi.org/10.5194/acp-13-2793-2013, 2013
J. Segschneider, A. Beitsch, C. Timmreck, V. Brovkin, T. Ilyina, J. Jungclaus, S. J. Lorenz, K. D. Six, and D. Zanchettin
Biogeosciences, 10, 669–687, https://doi.org/10.5194/bg-10-669-2013, https://doi.org/10.5194/bg-10-669-2013, 2013
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Catchment tracers reveal discharge, recharge and sources of groundwater-borne pollutants in a novel lake modelling approach
Stable isotopic constraints on global soil organic carbon turnover
Spatial variations in snowpack chemistry, isotopic composition of NO3− and nitrogen deposition from the ice sheet margin to the coast of western Greenland
Use of flow cytometry and stable isotope analysis to determine phytoplankton uptake of wastewater derived ammonium in a nutrient-rich river
Mn∕Ca intra- and inter-test variability in the benthic foraminifer Ammonia tepida
Modeling calcification periods of Cytheridella ilosvayi from Florida based on isotopic signatures and hydrological data
Interaction of CO2 concentrations and water stress in semiarid plants causes diverging response in instantaneous water use efficiency and carbon isotope composition
Quantifying nutrient uptake as driver of rock weathering in forest ecosystems by magnesium stable isotopes
Long-term carbon and nitrogen dynamics at SPRUCE revealed through stable isotopes in peat profiles
Nitrogen input 15N signatures are reflected in plant 15N natural abundances in subtropical forests in China
Quentin Charbonnier, Julien Bouchez, Jérôme Gaillardet, and Éric Gayer
Biogeosciences, 17, 5989–6015, https://doi.org/10.5194/bg-17-5989-2020, https://doi.org/10.5194/bg-17-5989-2020, 2020
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The abundance and isotope composition of the trace metal barium (Ba) allows us to track and quantify nutrient cycling throughout the Amazon Basin. In particular, we show that the Ba biological fingerprint evolves from that of a strong net nutrient uptake in the mountainous area of the Andes towards efficient nutrient recycling on the plains of the Lower Amazon. Our study highlights the fact that the geochemical signature of rock-derived nutrients transported by the Amazon is scarred by life.
Ajinkya G. Deshpande, Thomas W. Boutton, Ayumi Hyodo, Charles W. Lafon, and Georgianne W. Moore
Biogeosciences, 17, 5639–5653, https://doi.org/10.5194/bg-17-5639-2020, https://doi.org/10.5194/bg-17-5639-2020, 2020
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Wetland forests in the southern USA are threatened by changing climate and human-induced pressures. We used tree ring widths and C isotopes as indicators of forest growth and physiological stress, respectively, and compared these to past climate data. We observed that vegetation growing in the drier patches is susceptible to stress, while vegetation growth and physiology in wetter patches is less sensitive to unfavorable environmental conditions, highlighting the importance of optimal wetness.
Dominika Lewicka-Szczebak, Maciej Piotr Lewicki, and Reinhard Well
Biogeosciences, 17, 5513–5537, https://doi.org/10.5194/bg-17-5513-2020, https://doi.org/10.5194/bg-17-5513-2020, 2020
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We present the first validation of N2O isotopic approaches for estimating N2O source pathways and N2O reduction. These approaches are widely used for tracing soil nitrogen cycling, but the results of these estimations are very uncertain. Here we report the results from parallel treatments allowing for precise validation of these approaches, and we propose the best strategies for results interpretation, including the new idea of an isotope model integrating three isotopic signatures of N2O.
Markus Raitzsch, Claire Rollion-Bard, Ingo Horn, Grit Steinhoefel, Albert Benthien, Klaus-Uwe Richter, Matthieu Buisson, Pascale Louvat, and Jelle Bijma
Biogeosciences, 17, 5365–5375, https://doi.org/10.5194/bg-17-5365-2020, https://doi.org/10.5194/bg-17-5365-2020, 2020
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The isotopic composition of boron in carbonate shells of marine unicellular organisms is a popular tool to estimate seawater pH. Usually, many shells need to be dissolved and measured for boron isotopes, but the information on their spatial distribution is lost. Here, we investigate two techniques that allow for measuring boron isotopes within single shells and show that they yield robust mean values but provide additional information on the heterogeneity within and between single shells.
Florian Einsiedl, Anja Wunderlich, Mathieu Sebilo, Ömer K. Coskun, William D. Orsi, and Bernhard Mayer
Biogeosciences, 17, 5149–5161, https://doi.org/10.5194/bg-17-5149-2020, https://doi.org/10.5194/bg-17-5149-2020, 2020
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Nitrate pollution of freshwaters and methane emissions into the atmosphere are crucial factors in deteriorating the quality of drinking water and in contributing to global climate change. Here, we report vertical concentration and stable isotope profiles of CH4, NO3-, NO2-, and NH4+ in the water column of Fohnsee (southern Bavaria, Germany) that may indicate linkages between nitrate-dependent anaerobic methane oxidation and the anaerobic oxidation of ammonium.
Ruifang C. Xie, Frédéric A. C. Le Moigne, Insa Rapp, Jan Lüdke, Beat Gasser, Marcus Dengler, Volker Liebetrau, and Eric P. Achterberg
Biogeosciences, 17, 4919–4936, https://doi.org/10.5194/bg-17-4919-2020, https://doi.org/10.5194/bg-17-4919-2020, 2020
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Thorium-234 (234Th) is widely used to study carbon fluxes from the surface ocean to depth. But few studies stress the relevance of oceanic advection and diffusion on the downward 234Th fluxes in nearshore environments. Our study in offshore Peru showed strong temporal variations in both the importance of physical processes on 234Th flux estimates and the oceanic residence time of 234Th, whereas salinity-derived seawater 238U activities accounted for up to 40 % errors in 234Th flux estimates.
Ralf A. Oeser and Friedhelm von Blanckenburg
Biogeosciences, 17, 4883–4917, https://doi.org/10.5194/bg-17-4883-2020, https://doi.org/10.5194/bg-17-4883-2020, 2020
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We present a novel strategy to decipher the relative impact of biogenic and abiotic drivers of weathering. We parameterized the nutrient fluxes in four ecosystems along a climate and vegetation gradient situated on the Chilean Coastal Cordillera. We investigated how nutrient demand by plants drives weathering. We found that the increase in biomass nutrient demand is accommodated by faster nutrient recycling rather than an increase in the weathering–release rates.
Tito Arosio, Malin M. Ziehmer, Kurt Nicolussi, Christian Schlüchter, and Markus Leuenberger
Biogeosciences, 17, 4871–4882, https://doi.org/10.5194/bg-17-4871-2020, https://doi.org/10.5194/bg-17-4871-2020, 2020
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Stable isotopes in tree-ring cellulose are tools for climatic reconstructions, but interpretation is challenging due to nonclimate trends. We analyzed the tree-age trends in tree-ring isotopes of deciduous larch and evergreen cembran pine. Samples covering the whole Holocene were collected at the tree line in the Alps. For cambial ages over 100 years, we prove the absence of age trends in δD, δ18O, and δ13C for both species. For lower cambial ages, trends differ for each isotope and species.
Yuyang He, Xiaobin Cao, and Huiming Bao
Biogeosciences, 17, 4785–4795, https://doi.org/10.5194/bg-17-4785-2020, https://doi.org/10.5194/bg-17-4785-2020, 2020
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Different carbon sites in a large organic molecule have different isotope compositions. Different carbon sites may not have the chance to exchange isotopes at all. The lack of appreciation of this notion might be blamed for an unsettled debate on the thermodynamic state of an organism. Here we demonstrate using minerals, N2O, and acetic acid that the dearth of exchange among different carbon sites renders them as independent as if they were different elements in organic molecules.
Felix M. Spielmann, Albin Hammerle, Florian Kitz, Katharina Gerdel, and Georg Wohlfahrt
Biogeosciences, 17, 4281–4295, https://doi.org/10.5194/bg-17-4281-2020, https://doi.org/10.5194/bg-17-4281-2020, 2020
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Carbonyl sulfide (COS) can be used as a proxy for plant photosynthesis on an ecosystem scale. However, the relationships between COS and CO2 fluxes and their dependence on daily to seasonal changes in environmental drivers are still poorly understood. We examined COS and CO2 ecosystem fluxes above an agriculturally used mountain grassland for 6 months. Harvesting of the grassland disturbed the otherwise stable COS-to-CO2 uptake ratio. We even found the canopy to release COS during those times.
Getachew Agmuas Adnew, Thijs L. Pons, Gerbrand Koren, Wouter Peters, and Thomas Röckmann
Biogeosciences, 17, 3903–3922, https://doi.org/10.5194/bg-17-3903-2020, https://doi.org/10.5194/bg-17-3903-2020, 2020
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We measured the effect of photosynthesis, the largest flux in the carbon cycle, on the triple oxygen isotope composition of atmospheric CO2 at the leaf level during gas exchange using three plant species. The main factors that limit the impact of land vegetation on the triple oxygen isotope composition of atmospheric CO2 are identified, characterized and discussed. The effect of photosynthesis on the isotopic composition of CO2 is commonly quantified as discrimination (ΔA).
Moritz Schroll, Frank Keppler, Markus Greule, Christian Eckhardt, Holger Zorn, and Katharina Lenhart
Biogeosciences, 17, 3891–3901, https://doi.org/10.5194/bg-17-3891-2020, https://doi.org/10.5194/bg-17-3891-2020, 2020
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Fungi have recently been identified to produce the greenhouse gas methane. Here, we investigated the stable carbon isotope values of methane produced by saprotrophic fungi. Our results show that stable isotope values of methane from fungi are dependent on the fungal species and the metabolized substrate. They cover a broad range and overlap with stable carbon isotope values of methane reported for methanogenic archaea, the thermogenic degradation of organic matter, and other eukaryotes.
Pranav Hirave, Guido L. B. Wiesenberg, Axel Birkholz, and Christine Alewell
Biogeosciences, 17, 2169–2180, https://doi.org/10.5194/bg-17-2169-2020, https://doi.org/10.5194/bg-17-2169-2020, 2020
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Sediment input into water bodies is a prominent threat to freshwater ecosystems. We tested the stability of tracers employed in freshwater sediment tracing based on compound-specific isotope analysis during early degradation in soil. While bulk δ13C values showed no stability, δ13C values of plant-derived fatty acids and n-alkanes were stably transferred to the soil without soil particle size dependency after an early degradation in organic horizons, thus indicating their suitability as tracers.
Daniel A. Frick, Rainer Remus, Michael Sommer, Jürgen Augustin, and Friedhelm von Blanckenburg
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-66, https://doi.org/10.5194/bg-2020-66, 2020
Revised manuscript accepted for BG
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Silicon is taken up by some plants to increase structural stability and to develop stress resistance, and is rejected by others. To explore the underlying mechanisms we used the stable isotopes of silicon that shift in their relative abundance depending on the biochemical transformation involved. On species with a rejective (tomato, mustard) and active (wheat) uptake mechanism, grown in hydroculture, we found that the transport of silicic acid is controlled by the precipitation of biogenic opal.
Caroline Thaler, Amandine Katz, Magali Bonifacie, Bénédicte Ménez, and Magali Ader
Biogeosciences, 17, 1731–1744, https://doi.org/10.5194/bg-17-1731-2020, https://doi.org/10.5194/bg-17-1731-2020, 2020
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Paleoenvironment reconstructions, retrieved from δ18O and Δ47 values measured in carbonate, are compromised when crystallization occurs in isotopic disequilibrium. We show that some paleoenvironmental information can still be retrieved from these paired disequilibrium Δ47 and δ18O values. The possibility of retrieving information on paleowaters, sediments' interstitial waters, or organisms' body water at the carbonate precipitation loci will help understand past Earth and life evolution.
Guillaume Humbert, Mathieu Sébilo, Justine Fiat, Longqi Lang, Ahlem Filali, Véronique Vaury, Mathieu Spérandio, and Anniet M. Laverman
Biogeosciences, 17, 979–993, https://doi.org/10.5194/bg-17-979-2020, https://doi.org/10.5194/bg-17-979-2020, 2020
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Mitigating emissions of the greenhouse gas N2O requires understanding of the relative contribution of its producing processes in response to environmental variables. We show, using isotopic analysis, that N2O emissions from a nitrifying system were sensitive to oxygenation, temperature and NH4+ concentrations with nitrite reduction being the main N2O source. Temperature appears to be the main control on N2O production, due to its dissimilar effects on ammonium and nitrite oxidizing activities.
Oguz Yigiterhan, Ebrahim Mohd Al-Ansari, Alex Nelson, Mohamed Alaa Abdel-Moati, Jesse Turner, Hamood Abdulla Alsaadi, Barbara Paul, Ibrahim Abdullatif Al-Maslamani, Mehsin Abdulla Al-Ansi Al-Yafei, and James W. Murray
Biogeosciences, 17, 381–404, https://doi.org/10.5194/bg-17-381-2020, https://doi.org/10.5194/bg-17-381-2020, 2020
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We analyze net-tow samples of plankton and associated particulate matter from the Exclusive Economic Zone, Qatar, Arabian Gulf, using net tows with mesh sizes of 50 and 200 μm to examine the composition of plankton populations. We also focus on the role and composition of the atmospheric dust, representative of terrigenous material, deposited in the Gulf. We concluded that Al, Fe, Cr, Co, Mn, Ni, Pb, and Li are of dust origin and As, Cd, Cu, Mo, Zn, and Ca are of anthropogenic/biogenic origin.
Clare Woulds, James B. Bell, Adrian G. Glover, Steven Bouillon, and Louise S. Brown
Biogeosciences, 17, 1–12, https://doi.org/10.5194/bg-17-1-2020, https://doi.org/10.5194/bg-17-1-2020, 2020
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Sedimented hydrothermal vents occur where heated, mineral-rich (hydrothermal) water seeps through seafloor sediments. They host chemosynthetic microbes, which use chemical energy to fix dissolved carbon dioxide into sugars (chemosynthesis). We conducted carbon tracing experiments, and observed chemosynthesis at both vent and non-vent sites. Thus, chemosynthesis occurred over a much larger area than expected, suggesting it is more widespread than previously thought.
Cara C. Manning, Rachel H. R. Stanley, David P. Nicholson, Brice Loose, Ann Lovely, Peter Schlosser, and Bruce G. Hatcher
Biogeosciences, 16, 3351–3376, https://doi.org/10.5194/bg-16-3351-2019, https://doi.org/10.5194/bg-16-3351-2019, 2019
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We measured rates of biological activity and gas exchange in a Canadian estuary during ice melt. We quantified gas exchange using inert, deliberately released tracers and found that the gas transfer rate at > 90 % ice cover was 6 % of the rate for nearly ice-free conditions. We measured oxygen concentration and isotopic composition and used the data to detect changes in the rates of photosynthesis and respiration (autotrophy and heterotrophy) as the ice melted.
Marlène Lavrieux, Axel Birkholz, Katrin Meusburger, Guido L. B. Wiesenberg, Adrian Gilli, Christian Stamm, and Christine Alewell
Biogeosciences, 16, 2131–2146, https://doi.org/10.5194/bg-16-2131-2019, https://doi.org/10.5194/bg-16-2131-2019, 2019
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A fingerprinting approach using compound-specific stable isotopes was applied to a lake sediment core to reconstruct erosion processes over the past 150 years in a Swiss catchment. Even though the reconstruction of land use and eutrophication history was successful, the observation of comparatively low δ13C values of plant-derived fatty acids in the sediment suggests their alteration within the lake. Thus, their use as a tool for source attribution in sediment cores needs further investigation.
Luciana A. Pereira, Roberto V. Santos, Marília Hauser, Fabrice Duponchelle, Fernando Carvajal, Christophe Pecheyran, Sylvain Bérail, and Marc Pouilly
Biogeosciences, 16, 1781–1797, https://doi.org/10.5194/bg-16-1781-2019, https://doi.org/10.5194/bg-16-1781-2019, 2019
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This study presents the first step for a chemical origin certification of pirarucu fishery in the Amazon. A preliminary isotopic tool to improve the actual tracking system integrates ecological, social, and economic aspects of Amazon dynamics. The geographic origin validation of farmed and wild fishes contributes to environmental and social practices, secures food and income to communities, helps manage endangered species, reinforces aquaculture, and combats illegal fisheries.
Sarah Conrad, Johan Ingri, Johan Gelting, Fredrik Nordblad, Emma Engström, Ilia Rodushkin, Per S. Andersson, Don Porcelli, Örjan Gustafsson, Igor Semiletov, and Björn Öhlander
Biogeosciences, 16, 1305–1319, https://doi.org/10.5194/bg-16-1305-2019, https://doi.org/10.5194/bg-16-1305-2019, 2019
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Iron analysis of the particulate, colloidal, and truly dissolved fractions along the Lena River freshwater plume showed that the particulate iron dominates close to the coast. Over 99 % particulate and about 90 % colloidal iron were lost, while the truly dissolved phase was almost constant. Iron isotopes suggest that the shelf acts as a sink for particles and colloids with negative iron isotope values, while colloids with positive iron isotope values travel further out into the Arctic Ocean.
Elizabeth Verhoeven, Matti Barthel, Longfei Yu, Luisella Celi, Daniel Said-Pullicino, Steven Sleutel, Dominika Lewicka-Szczebak, Johan Six, and Charlotte Decock
Biogeosciences, 16, 383–408, https://doi.org/10.5194/bg-16-383-2019, https://doi.org/10.5194/bg-16-383-2019, 2019
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This study utilized state-of-the-art measurements of nitrogen isotopes to evaluate nitrogen cycling and to assess the biological sources of the potent greenhouse gas, N2O, in response to water-saving practices in rice systems. Water-saving practices did emit more N2O, and high N2O production had a lower 15N isotope signature. Modeling and visual interpretation indicate that these emissions mostly came from denitrification or nitrifier denitrification, controlled upstream by nitrification rates.
Feifei Deng, Gideon M. Henderson, Maxi Castrillejo, Fiz F. Perez, and Reiner Steinfeldt
Biogeosciences, 15, 7299–7313, https://doi.org/10.5194/bg-15-7299-2018, https://doi.org/10.5194/bg-15-7299-2018, 2018
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To better use Pa / Th to reconstruct deep water ventilation rate, we assessed controls on 230Th and 231Pa in the northern North Atlantic. With extended optimum multi-parameter analysis and CFC-based water-mass age, we found the imprint of young overflow water on Th and Pa and enhanced scavenging near the seafloor. A significantly higher advective loss of Pa to the south relative to Th in the Atlantic was estimated, supporting the use of Pa / Th for assessing basin-scale meridional transport.
Anne L. Morée, Jörg Schwinger, and Christoph Heinze
Biogeosciences, 15, 7205–7223, https://doi.org/10.5194/bg-15-7205-2018, https://doi.org/10.5194/bg-15-7205-2018, 2018
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Changes in the distribution of the carbon isotope 13C can be used to study the climate system if the governing processes (ocean circulation and biogeochemistry) are understood. We show the Southern Ocean importance for the global 13C distribution and that changes in 13C can be strongly influenced by biogeochemistry. Interpretation of 13C as a proxy for climate signals needs to take into account the effects of changes in biogeochemistry in addition to changes in ocean circulation.
Douglas G. Russell, Wei Wen Wong, and Perran L. M. Cook
Biogeosciences, 15, 7225–7234, https://doi.org/10.5194/bg-15-7225-2018, https://doi.org/10.5194/bg-15-7225-2018, 2018
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Nitrogen is an important nutrient in marine environments and is continually converted from one form to another. One way these processes can be investigated is by looking at the ratio of the 15N and 14N stable isotopes of different nitrogen-containing compounds. To date few studies have compared these ratios in seagrass beds, their associated sediments and the porewater NH4+ pool. The strong relationship between these nitrogen pools suggests that nitrogen is tightly recycled within seagrass beds.
Bharat Rastogi, Max Berkelhammer, Sonia Wharton, Mary E. Whelan, Frederick C. Meinzer, David Noone, and Christopher J. Still
Biogeosciences, 15, 7127–7139, https://doi.org/10.5194/bg-15-7127-2018, https://doi.org/10.5194/bg-15-7127-2018, 2018
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Carbonyl sulfide (OCS) has gained prominence as an independent tracer for gross primary productivity, which is usually modelled by partitioning net CO2 fluxes. Here, we present a simple empirical model for estimating ecosystem-scale OCS fluxes for a temperate old-growth forest and find that OCS sink strength scales with independently estimated CO2 uptake and is sensitive to the the fraction of downwelling diffuse light. We also examine the response of OCS and CO2 fluxes to sequential heat waves.
Fumiko Nakagawa, Urumu Tsunogai, Yusuke Obata, Kenta Ando, Naoyuki Yamashita, Tatsuyoshi Saito, Shigeki Uchiyama, Masayuki Morohashi, and Hiroyuki Sase
Biogeosciences, 15, 7025–7042, https://doi.org/10.5194/bg-15-7025-2018, https://doi.org/10.5194/bg-15-7025-2018, 2018
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To clarify the biological processing of nitrate within temperate forested catchments using unprocessed atmospheric nitrate exported from each catchment as a tracer, we continuously monitored stream nitrate concentrations and stable isotopic compositions in three forested catchments for more than 2 years. We concluded that the export flux of unprocessed atmospheric nitrate relative to the deposition flux in each forest ecosystem is applicable as an index for nitrogen saturation.
Lucie Cassarino, Christopher D. Coath, Joana R. Xavier, and Katharine R. Hendry
Biogeosciences, 15, 6959–6977, https://doi.org/10.5194/bg-15-6959-2018, https://doi.org/10.5194/bg-15-6959-2018, 2018
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Using a simple model, we show that the silicon isotopic composition of sponges can be used to estimate the silicic acid concentration of seawater, a key parameter linked to nutrient and carbon cycling. However, our data illustrate that skeletal type and growth rate also control silicon isotopic composition of sponges. Our study demonstrates the paleoceanographic utility of sponges as an archive for ocean silica content provided that suitable skeleton types are selected.
Laurie C. Hofmann and Svenja Heesch
Biogeosciences, 15, 6139–6149, https://doi.org/10.5194/bg-15-6139-2018, https://doi.org/10.5194/bg-15-6139-2018, 2018
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The ability of marine macroalgae to adapt to changing ocean chemistry will depend on the flexibility of their inorganic carbon uptake mechanisms across biogeographic ranges. Therefore, we investigated the plasticity of inorganic carbon uptake mechanisms in north Atlantic rhodoliths – free-living calcifying red algae that form important benthic habitats in coastal environments. We observed flexible mechanisms related to seawater DIC concentrations, indicating the potential for adaptation.
Jacqueline Bertlich, Dirk Nürnberg, Ed C. Hathorne, Lennart J. de Nooijer, Eveline M. Mezger, Markus Kienast, Steffanie Nordhausen, Gert-Jan Reichart, Joachim Schönfeld, and Jelle Bijma
Biogeosciences, 15, 5991–6018, https://doi.org/10.5194/bg-15-5991-2018, https://doi.org/10.5194/bg-15-5991-2018, 2018
Jill N. Sutton, Gregory F. de Souza, Maribel I. García-Ibáñez, and Christina L. De La Rocha
Biogeosciences, 15, 5663–5676, https://doi.org/10.5194/bg-15-5663-2018, https://doi.org/10.5194/bg-15-5663-2018, 2018
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The silicon stable isotope distribution determined from samples collected from the North Atlantic Ocean indicates that water mass subduction and circulation are the dominant processes controlling the distribution of dissolved silicon in this region. In addition, these data provide a clear view of the direct interaction between northern and southern water masses and the extent to which the silicon isotope composition of these silica-poor waters is influenced by hydrography.
Maxi Castrillejo, Núria Casacuberta, Marcus Christl, Christof Vockenhuber, Hans-Arno Synal, Maribel I. García-Ibáñez, Pascale Lherminier, Géraldine Sarthou, Jordi Garcia-Orellana, and Pere Masqué
Biogeosciences, 15, 5545–5564, https://doi.org/10.5194/bg-15-5545-2018, https://doi.org/10.5194/bg-15-5545-2018, 2018
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The investigation of water mass transport pathways and timescales is important to understand the global ocean circulation. Following earlier studies, we use artificial radionuclides introduced to the oceans in the 1950s to investigate the water transport in the subpolar North Atlantic (SPNA). For the first time, we combine measurements of the long-lived iodine-129 and uranium-236 to confirm earlier findings/hypotheses and to better understand shallow and deep ventilation processes in the SPNA.
Gustaf Granath, Håkan Rydin, Jennifer L. Baltzer, Fia Bengtsson, Nicholas Boncek, Luca Bragazza, Zhao-Jun Bu, Simon J. M. Caporn, Ellen Dorrepaal, Olga Galanina, Mariusz Gałka, Anna Ganeva, David P. Gillikin, Irina Goia, Nadezhda Goncharova, Michal Hájek, Akira Haraguchi, Lorna I. Harris, Elyn Humphreys, Martin Jiroušek, Katarzyna Kajukało, Edgar Karofeld, Natalia G. Koronatova, Natalia P. Kosykh, Mariusz Lamentowicz, Elena Lapshina, Juul Limpens, Maiju Linkosalmi, Jin-Ze Ma, Marguerite Mauritz, Tariq M. Munir, Susan M. Natali, Rayna Natcheva, Maria Noskova, Richard J. Payne, Kyle Pilkington, Sean Robinson, Bjorn J. M. Robroek, Line Rochefort, David Singer, Hans K. Stenøien, Eeva-Stiina Tuittila, Kai Vellak, Anouk Verheyden, James Michael Waddington, and Steven K. Rice
Biogeosciences, 15, 5189–5202, https://doi.org/10.5194/bg-15-5189-2018, https://doi.org/10.5194/bg-15-5189-2018, 2018
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Peat constitutes a long-term archive for climate reconstruction by using the isotopic composition of carbon and oxygen. We analysed isotopes in two peat moss species across North America and Eurasia. Peat (moss tissue) isotope composition was predicted by soil moisture and isotopic composition of the rainwater but differed between species. Our results suggest that isotope composition can be used on a large scale for climatic reconstructions but that such models should be species-specific.
Joshua A. Haslun, Nathaniel E. Ostrom, Eric L. Hegg, and Peggy H. Ostrom
Biogeosciences, 15, 3873–3882, https://doi.org/10.5194/bg-15-3873-2018, https://doi.org/10.5194/bg-15-3873-2018, 2018
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N2O δ15N and δ18O values changed non-linearly during in vitro N2O production by bacterial denitrification of NO3−, an argument against their use in N2O apportionment. We present a novel approach for describing non-linear isotopic behaviour, which may be applied to other multi-step reactions. We also show that the intramolecular distribution of 15N in N2O, used to apportion N2O emissions to denitrification and nitrification, is unaffected by electron donor source and electron donor concentration.
Linas Balčiauskas, Raminta Skipitytė, Marius Jasiulionis, Laima Balčiauskienė, and Vidmantas Remeikis
Biogeosciences, 15, 3883–3891, https://doi.org/10.5194/bg-15-3883-2018, https://doi.org/10.5194/bg-15-3883-2018, 2018
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Effects of an expanding great cormorant colony on small mammals were evaluated. An increase of the number of bird pairs led to decreased δ13C and increased δ15N values in mice hair after the first year of nest appearance. Differences in isotopic signatures were related to species of rodents, pointing to the differences in their diet. Cormorant influence was indirect, the result of biological pollution from guano on rodent foods. Scaring cormorants from the colonies may have the opposite effect.
Wu Sun, Kadmiel Maseyk, Céline Lett, and Ulli Seibt
Biogeosciences, 15, 3277–3291, https://doi.org/10.5194/bg-15-3277-2018, https://doi.org/10.5194/bg-15-3277-2018, 2018
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Carbonyl sulfide (COS) is an emerging tracer to probe land photosynthesis at canopy to global scales, but the relationship between leaf COS and CO2 fluxes needed for this application is poorly quantified. With in situ leaf fluxes of COS and CO2 measured in a freshwater marsh, we show that light and vapor deficit control the relationship between leaf COS and CO2 fluxes by regulating stomatal conductance. Our findings support the use of COS as a tracer for canopy photosynthesis.
Anne Alexandre, Amarelle Landais, Christine Vallet-Coulomb, Clément Piel, Sébastien Devidal, Sandrine Pauchet, Corinne Sonzogni, Martine Couapel, Marine Pasturel, Pauline Cornuault, Jingming Xin, Jean-Charles Mazur, Frédéric Prié, Ilhem Bentaleb, Elizabeth Webb, Françoise Chalié, and Jacques Roy
Biogeosciences, 15, 3223–3241, https://doi.org/10.5194/bg-15-3223-2018, https://doi.org/10.5194/bg-15-3223-2018, 2018
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There is a lack of proxies suitable for reconstructing, in a quantitative way, past changes in continental atmospheric humidity, which is a key climate parameter. Here, we demonstrate through climate chamber and climate transect calibrations that the triple oxygen isotope composition of phytoliths offers a potential for reconstructing changes in relative humidity.
Philip M. Riekenberg, Joanne M. Oakes, and Bradley D. Eyre
Biogeosciences, 15, 2873–2889, https://doi.org/10.5194/bg-15-2873-2018, https://doi.org/10.5194/bg-15-2873-2018, 2018
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Shallow coastal waters are increasingly experiencing increased nutrient loading. Sediment algae within these systems are responsible for a large portion of C production, but we have limited knowledge of what happens to sediment microbial processing of MPB-C under increased nutrient conditions. This work examines how C-processing pathways change after increased short-term nutrient exposure, finding shifts in processing between microbial groups and increased export of algal C from the sediment.
Jill N. Sutton, Yi-Wei Liu, Justin B. Ries, Maxence Guillermic, Emmanuel Ponzevera, and Robert A. Eagle
Biogeosciences, 15, 1447–1467, https://doi.org/10.5194/bg-15-1447-2018, https://doi.org/10.5194/bg-15-1447-2018, 2018
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The boron isotope composition of marine biogenic carbonates has been studied as a proxy for monitoring past changes in seawater pH and carbonate chemistry. We highlight the potential utility of the boron isotope composition of marine biogenic carbonates as a proxy of calcifying site pH for a wide range of calcifying taxa and the importance of using species-specific seawater-pH–boron isotope calibrations when reconstructing seawater pH from the boron isotope composition of biogenic carbonates.
Emil Kristensen, Mikkel Madsen-Østerbye, Philippe Massicotte, Ole Pedersen, Stiig Markager, and Theis Kragh
Biogeosciences, 15, 1203–1216, https://doi.org/10.5194/bg-15-1203-2018, https://doi.org/10.5194/bg-15-1203-2018, 2018
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We propose a novel modelling approach enabling swift hydrological surveys based on multiple conservative and non-conservative tracers to estimate water retention time, groundwater discharge sites, fractions of water originating from the discharge sites, groundwater recharge sites and sites that are especially important in regard to groundwater recharge. Thus we provide a whole lake hydrological survey while pinpointing sources of pollutants like colored dissolved organic matter and nutrients.
Chao Wang, Benjamin Z. Houlton, Dongwei Liu, Jianfeng Hou, Weixin Cheng, and Edith Bai
Biogeosciences, 15, 987–995, https://doi.org/10.5194/bg-15-987-2018, https://doi.org/10.5194/bg-15-987-2018, 2018
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Soil contains a large amount of organic carbon and plays a crucial role in regulating Earth's C cycle and climate system. In this study, we collected soil-carbon isotope data within a 1 m depth globally and provided an isotope-based approach for understanding soil carbon decomposition rate. Compared with other methods, utilization of C isotope composition ratios in the soil profile provides an independent approach that does not rely on disruption of plant-soil-microbe interactions.
Chris J. Curtis, Jan Kaiser, Alina Marca, N. John Anderson, Gavin Simpson, Vivienne Jones, and Erika Whiteford
Biogeosciences, 15, 529–550, https://doi.org/10.5194/bg-15-529-2018, https://doi.org/10.5194/bg-15-529-2018, 2018
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Few studies have investigated the atmospheric deposition of nitrate in the Arctic or its impacts on Arctic ecosystems. We collected late-season snowpack from three regions in western Greenland from the coast to the edge of the ice sheet. We found major differences in nitrate concentrations (lower at the coast) and deposition load (higher). Nitrate in snowpack undergoes losses and isotopic enrichment which are greatest in inland areas; hence deposition impacts may be greatest at the coast.
Calla M. Schmidt, Tamara E. C. Kraus, Megan B. Young, and Carol Kendall
Biogeosciences, 15, 353–367, https://doi.org/10.5194/bg-15-353-2018, https://doi.org/10.5194/bg-15-353-2018, 2018
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In this study we measured phytoplankton use of nitrogen from wastewater treatment plant effluent in a river. The project was designed to test a new technique for isolating phytoplankton from river water prior to isotopic analysis in order to use trace nitrogen source use under environmental conditions. This study helps us understand the fate of anthropogenic nitrogen in aquatic ecosystems, which is essential to establishing effective nutrient management plans.
Jassin Petersen, Christine Barras, Antoine Bézos, Carole La, Lennart J. de Nooijer, Filip J. R. Meysman, Aurélia Mouret, Caroline P. Slomp, and Frans J. Jorissen
Biogeosciences, 15, 331–348, https://doi.org/10.5194/bg-15-331-2018, https://doi.org/10.5194/bg-15-331-2018, 2018
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In Lake Grevelingen, a coastal ecosystem, foraminifera experience important temporal variations in oxygen concentration and in pore water manganese. The high resolution of LA-ICP-MS allows us to analyse the chambers of foraminiferal shells separately and to obtain signals from a series of calcification events. We estimate the variability in Mn/Ca observed within single shells due to biomineralization and show that a substantial part of the signal is related to environmental variability.
Juliane Meyer, Claudia Wrozyna, Albrecht Leis, and Werner E. Piller
Biogeosciences, 14, 4927–4947, https://doi.org/10.5194/bg-14-4927-2017, https://doi.org/10.5194/bg-14-4927-2017, 2017
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Isotopic signatures of ostracods from Florida correlate with their host water, implying a regional influence of temperature and precipitation. Calculated monthly configurations of a theoretical calcite formed in rivers were compared to ostracod isotope compositions. The data suggest a seasonal shell formation during early spring that is coupled to the hydrological cycle of the region. The surprising seasonality of the investigated ostracods is of importance for paleontological interpretation.
Na Zhao, Ping Meng, Yabing He, and Xinxiao Yu
Biogeosciences, 14, 3431–3444, https://doi.org/10.5194/bg-14-3431-2017, https://doi.org/10.5194/bg-14-3431-2017, 2017
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Few researchers have investigated post-photosynthetic 13C fractionation happening in leaves. Potted saplings were cultivated under orthogonal treatments of CO2 concentration and soil water content. The 13C fractionation from mesophyll conductance and post-carboxylation both contributed to the total 13C fractionation that was determined by δ13C of water-soluble compounds and gas-exchange measurements.
David Uhlig, Jan A. Schuessler, Julien Bouchez, Jean L. Dixon, and Friedhelm von Blanckenburg
Biogeosciences, 14, 3111–3128, https://doi.org/10.5194/bg-14-3111-2017, https://doi.org/10.5194/bg-14-3111-2017, 2017
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Plants and soil microbiota play an active role in rock weathering. Here we show that the coupling between erosion and weathering might be established by nutrients that are taken up by trees, are not recycled from plant litter and are missing in the dissolved river flux due to forest re-growth after clear cutting or due to erosion as coarse woody debris. To track this nutrient pathway we used magnesium stable isotopes in combination with innovative metrics over annual and millennial timescales.
Erik A. Hobbie, Janet Chen, Paul J. Hanson, Colleen M. Iversen, Karis J. McFarlane, Nathan R. Thorp, and Kirsten S. Hofmockel
Biogeosciences, 14, 2481–2494, https://doi.org/10.5194/bg-14-2481-2017, https://doi.org/10.5194/bg-14-2481-2017, 2017
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We measured carbon and nitrogen isotope ratios (13C : 12C and 15N : 14N) in peat cores in a northern Minnesota bog to understand how climate, vegetation type, and decomposition affected C and N budgets over the last 9000 years. 13C : 12C patterns were primarily influenced by shifts in temperature, peatland vegetation and atmospheric CO2, whereas tree colonization and upland N influxes affected 15N : 14N ratios. Isotopic markers provided new insights into long-term patterns of CO2 and nitrogen losses.
Geshere Abdisa Gurmesa, Xiankai Lu, Per Gundersen, Yunting Fang, Qinggong Mao, Chen Hao, and Jiangming Mo
Biogeosciences, 14, 2359–2370, https://doi.org/10.5194/bg-14-2359-2017, https://doi.org/10.5194/bg-14-2359-2017, 2017
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We measured the abundance of a nitrogen (N) isotope (15N) in two subtropical forests in China to study the cycling of input N (deposition and addition). Plant leaves in both forests were 15N-depleted relative to the atmospheric standard, likely as an imprint from 15N-depleted deposition. Plant 15N changed into 15N of the added N, indicating incorporation of N into plants. Thus, interpretations of ecosystem 15N from high-N-deposition regions need to include data on the 15N deposition signature.
Cited articles
Agnihotri, R., Bhattacharya, S. K., Sarin, M. M., and Somayajulu, B. L. K.:
Changes in surface productivity and subsurface denitrification during the
Holocene: a multiproxy study from the eastern Arabian Sea, Holocene, 13,
701–713, 2003.
Agnihotri, R., Kurian, S., Fernandes, M., Reshma, K., D'Souza, W., and Naqvi,
S. W. A.: Variability of subsurface denitrification and surface productivity
in the coastal eastern Arabian Sea over the past seven centuries, Holocene,
18, 755–764, 2008.
Agnihotri, R., Naqvi, S. W. A., Kurian, S., Altabet, M. A., and Bratton, J.
F.: Is delta N-15 of Sedimentary Organic Matter a Good Proxy for
Paleodenitrification in Coastal Waters of the Eastern Arabian Sea?, in:
Indian Ocean Biogeochemical Processes and Ecological Variability, edited by:
Wiggert, J. D., Hood, R. R., Naqvi, S. W. A., Brink, K. H., and Smith, S. L.,
Geophysical Monograph Series, American Geophysical Union, Washington, 2009.
Agnihotri, R., Mandal, T. K., Karapurkar, S. G., Naja, M., Gadi, R.,
Ahammmed, Y. N., Kumar, A., Saud, T., and Saxena, M.: Stable carbon and
nitrogen isotopic composition of bulk aerosols over India and northern Indian
Ocean, Atmos. Environ., 45, 2828–2835, 2011.
Altabet, M. A.: Isotopic Tracers of the Marine Nitrogen Cycle: Present and
Past, in: Marine Organic Matter: Biomarkers, Isotopes and DNA, The Handbook
of Environmental Chemistry, vol. 2N, edited by: Volkman, J. K., Springer,
Berlin, Heidelberg,
https://link.springer.com/chapter/10.1007/698_2_008, 2006.
Altabet, M. A. and Francois, R.: Sedimentary nitrogen isotopic ratio as a
recorder for surface ocean nitrate utilization, Global Biogeochem. Cy., 8,
103–116, 1994.
Altabet, M., Francois, R., Murray, D., and Prell, W.: Climate-related
variations in denitrification in the Arabian Sea from sediment
15N ∕ 14N ratios, Nature, 373, 506–509, 1995.
Altabet, M., Murray, D. W., and Prell, W.: Climatically linked oscillations
in Arabian Sea denitrification over the past 1 m.y.: Implications for the
marine N cycle, Paleoceanography, 14, 732–743, 1999.
Altabet, M., Higginson, M. J., and Murray, D. W.: The effect of
millennial-scale changes in Arabian Sea denitrification on atmospheric
CO2, Nature, 415, 159–162, 2002.
Anand, P., Kroon, D., Singh, A. D., Ganeshram, R. S., Ganssen, G., and
Elderfield, H.: Coupled sea surface temperature-seawater d18O reconstructions
in the Arabian Sea at the millenial scale for the last 35 ka,
Paleoceanography, 23, PA4207, https://doi.org/10.1029/2007PA001564, 2008.
Anderson, D. M. and Prell, W.: The structure of the southwest mosoon winds
over the Arabian Sea during the late Quaternary: observations, simulations,
and marine gelological evidence, J. Geophys. Res., 97, 15481–15487, 1992.
Annan, J. D. and Hargreaves, J. C.: A new global reconstruction of
temperature changes at the Last Glacial Maximum, Clim. Past, 9, 367–376,
https://doi.org/10.5194/cp-9-367-2013, 2013.
Aumont, O., Maier-Reimer, E., Blain, S., and Monfray, P.: An ecosystem model
of the global ocean including Fe, Si, P colimitations, Global Biogeochem.
Cy., 17, 1060, https://doi.org/10.1029/2001GB001745, 2003.
Azharuddin, S., Govil, P., Singh, A. D., Mishra, R., Agrawal, S., Tiwari, A.
K., and Kumar, K.: Monsoon-influenced variations in productivity and
lithogenic flux along offshore Saurashtra, NE Arabian Sea during the Holocene
and Younger Dryas: A multi-proxy approach, Palaeogeogr. Palaeocl., 483,
136–146, 2017.
Banakar, V. K., Oba, T., Chondakar, A. R., Kuramoto, T., Yamamoto, M., and
Minagawa, M.: Monsoon related changes in sea surface productivity and water
column denitrification in the Eastern Arabian Sea during the last glacial
cycle, Mar. Geol., 219, 99–108, 2005.
Banakar, V. K., Mahesh, B. S., Burr, G., and Chodankar, A. R.: Climatology of
the Eastern Arabian Sea during the last glacial cycle reconstructed from
paired measurement of foraminiferal delta O-18 and Mg ∕ Ca, Quatern.
Res., 73, 535–540, 2010.
Banse, K., Naqvi, S. W. A., Narvekar, P. V., Postel, J. R., and Jayakumar, D.
A.: Oxygen minimum zone of the open Arabian Sea: variability of oxygen and
nitrite from daily to decadal timescales, Biogeosciences, 11, 2237–2261,
https://doi.org/10.5194/bg-11-2237-2014, 2014.
Bard, E., Rostek, F., and Sonzogni, C.: Interhemispheric synchrony of the
last deglaciation inferred from alkenone palaeothermometry, Nature, 385,
707–710, 1997.
Berger, A.: Long-term variations of daily insolation and Quaternary climate
changes, J. Atmos. Sci., 35, 2362–2367, 1978.
Berger, A. and Loutre, M. F.: Insolation values for the climate of the last
10 million years, Quatern. Sci. Rev., 10, 297–317, 1991.
Berkelhammer, M., Sinha, A., Stott, L., Cheng, H., Pausata, F. S. R., and
Yoshimura, K.: An Abrupt Shift in the Indian Monsoon 4000 Years Ago, in:
Climates, Landscapes, and Civilizations, edited by: Giosan, L., Fuller, D.
Q., Nicoll, K., Flad, R. K., and Clift, P. D., Geophysical Monograph Series,
American Geophysical Union, Washington, 2012.
Bindoff, N. L. and McDougall, T. J.: Decadal changes along an Indian Ocean
section at 32∘ S and their interpretation, J. Phys. Oceanogr., 30,
1207–1222, 2000.
Böll, A., Lückge, A., Munz, P., Forke, S., Schulz, H., Ramaswamy, V.,
Rixen, T., Gaye, B., and Emeis, K.-C.: Late Holocene primary productivity and
sea surface temperature variations in the northeastern Arabian Sea:
Implications for winter monsoon variability, Paleoceanography, 29, 778–794,
https://doi.org/10.1002/2013PA002579, 2014.
Böll, A., Schulz, H., Munz, P., Rixen, T., Gaye, B., and Emeis, K.-C.:
Contrasting sea surface temperature of summer and winter monsoon variability
in the northern Arabian Sea over the last 25 ka, Palaeogeogr. Palaeocl.,
426, 10–21, 2015.
Bond, G., Showers, W., Cheseby, M., Lotti, R., Almasi, P., deMenocal, P. B.,
Priore, P., Cullen, H. M., Hajdas, I., and Bonani, G.: A pervasive
millenial-scale cycle in North Atlantic Holocene and Glacial Climates,
Science, 278, 1257–1266, 1997.
Böning, P. and Bard, E.: Millenial/centennial-scale thermocline
ventilation changes in the Indian Ocean as reflected by aragonite
preservation and geochemical variations in the Arabian Sea sediments,
Geochim. Cosmochim. Ac., 73, 6771–6788, 2009.
Braconnot, P, Harrison, S., Kageyama, M., Bartlein, P., Masson-Delmotte, V.,
Abe-Ouchi, A., Otto-Bliesner, B., and Zhao, Y.: Evaluation of climate models
using paleoclimatic data, Nat. Clim. Change, 2, 417–424, 2012.
Brahney, J., Ballantyne, A. P., Turner, B. L., Spaulding, S. A., Otu, M., and
Neff, J. C.: Separating the influences of diagenesis, productivity and
anthropogenic nitrogen deposition on sedimentary delta N-15 variations, Org.
Geochem., 75, 140–150, 2014.
Brandes, J. A. and Devol, A. H.: A global marine-fixed nitrogen isotopic
budget: Implications for Holocene nitrogen cycling, Global Biogeochem. Cy.,
16, 1120, https://doi.org/10.1029/2001GB001856, 2002.
Brandes, J. A., Devol, A. H., Yoshinari, T., Jayakumar, D. A., and Naqvi, S.
W. A.: Isotopic composition of nitrate in the central Arabian Sea and eastern
tropical North Pacific: A tracer for mixing and nitrogen cycles, Limnol.
Oceanogr., 43, 1680–1689, 1998.
Bristow, L. A., Callbeck, C. M., Larsen, M., Altabet, M. A., Dekaezemacker,
J., Forth, M., Gauns, M., Glud, R. N., Kuypers, M. M. M., Lavik, G., Milucka,
J., Naqvi, S. W. A., Pratihary, A., Revsbech, N. P., Thamdrup, B., Treusch,
A. H., and Canfield, D. E.: N2 production rates limited by nitrite
availability in the Bay of Bengal oxygen minimum zone, Nat. Geosci., 10,
24–29, 2017.
Brock, J. C., McClain, C. R., Luther, M. E., and Hay, W. W.: The
phytoplankton bloom in the northwestern Arabian Sea during the southwest
monsoon of 1979, J. Geophys. Res.-Oceans, 96, 20623–20642, 1991.
Broecker, W. S.: The Great Ocean Conveyor, Oceanography, 4, 79–89, 1991.
Buchanan, P. J., Matear, R. J., Lenton, A., Phipps, S. J., Chase, Z., and
Etheridge, D. M.: The simulated climate of the Last Glacial Maximum and
insights into the global marine carbon cycle, Clim. Past, 12, 2271–2295,
https://doi.org/10.5194/cp-12-2271-2016, 2016.
Bulow, S. E., Rich, J. J., Naik, H. S., Pratihary, A. K., and Ward, B. B.:
Denitrification exceeds anammox as a nitrogen loss pathway in the Arabian Sea
oxygen minimum zone, Deep-Sea Res. Pt. I, 57, 384–393, 2010.
Carpenter, E., Harvey, H., Fry, B., and Capone, D.: Biogeochemical tracers of
the marine cyanobacterium Trichodesmium, Deep-Sea Res. Pt. I, 44, 27–38,
1997.
Cartapanis, O., Bianchi, D., Jaccard, S. L., and Galbraith, E. D.: Global
pulses of organic carbon burial in deep-sea sediments during glacial maxima,
Nat. Commun., 7, 10796, https://doi.org/10.1038/ncomms10796, 2016.
Casciotti, K. L.: Nitrogen and Oxygen Isotopic Studies of the Marine Nitrogen
Cycle, Ann. Rev. Mar. Sci., 8, 379–407, 2016.
Clark, P. U., Dyke, A. S., Shakun, J. D., Carlson, A. E., Clark, J.,
Wohlfarth, B., Mitrovica, J. X., Hostetler, S. W., and McCabe, A. M.: The
Last Glacial Maximum, Science, 325, 710–714, 2009.
Cline, J. D. and Kaplan, I. R.: Isotopic fractionation of dissolved nitrate
during denitrification in the eastern tropical North Pacific, Mar. Chem., 3,
271–299, 1975.
Cline, J. D. and Richards, F. A.: Oxygen deficient conditions and nitrate
reduction in the eastern tropical North Pacific Ocean, Limnol. Oceanogr., 17,
885–900, 1972.
Codispoti, L. A.: An oceanic fixed nitrogen sink exceeding
400 Tg N a−1 vs the concept of homeostasis in the fixed-nitrogen
inventory, Biogeosciences, 4, 233–253,
https://doi.org/10.5194/bg-4-233-2007, 2007.
Codispoti, L. A., Brandes, J. A., Christensen, J. P., Devol, A. H., Naqvi, S.
W. A., Pearl, H. W., and Yoshinari, T.: The oceanic fixed nitrogen and
nitrous oxide budgets: Moving targets as we enter the anthropocene?, Sci.
Mar., 65, 85–105, 2001.
Cowie, G. L. and Hedges, J. I.: A comparison of organic matter sources,
diagenesis and preservation in oxic and anoxic coastal sites, Chem. Geol.,
107, 447–451, 1993.
Cowie, G., Mowbray, S., Kurian, S., Sarkar, A., White, C., Anderson, A.,
Vergnaud, B., Johnstone, G., Brear, S., Woulds, C., Naqvi, S. W. A., and
Kitazato, H.: Comparative organic geochemistry of Indian margin (Arabian Sea)
sediments: estuary to continental slope, Biogeosciences, 11, 6683–6696,
https://doi.org/10.5194/bg-11-6683-2014, 2014.
Das, M., Singh, R. K., Gupta, A. K., and Bhaumik, A. K.: Holocene
strengthening of the Oxygen Minimum Zone in the northwestern Arabian Sea
linked to changes in intermediate water circulation or Indian monsoon
intensity?, Palaeogeogr. Palaeocl., 483, 125–135, 2017.
Deutsch, C., Sigman, D. M., Thunell, R. C., Meckler, A. N., and Haug, G. H.:
Isotopic constraints on glacial/interglacial changes in the oceanic nitrogen
budget, Global Biogeochem. Cy., 18, GB4012, https://doi.org/10.1029/2003GB002189, 2004.
Devol, A. H.: Bacterial oxygen uptake kinetics as related to biological
processes in oxygen deficient zones of the ocean, Deep-Sea Res., 25,
137–146, 1978.
DeVries, T., Deutsch, C., Rafter, P. A., and Primeau, F.: Marine
denitrification rates determined from a global 3-D inverse model,
Biogeosciences, 10, 2481–2496, https://doi.org/10.5194/bg-10-2481-2013,
2013.
Duplessy, J. C.: Glacial to interglacial contrast in the northern Indian
Ocean, Nature, 295, 494–498, 1982.
Durgadoo, J. V., Ruhs, S., Biastoch, A., and Boning, C. W. B.: Indian Ocean
sources of Agulhas leakage, J. Geophys. Res.-Oceans, 122, 3481–3499, 2017.
Emeis, K.-C., Anderson, D. M., Doose, H., Kroon, D., and Schulz-Bull, D.:
Sea-Surface Temperatures and the History of Monsoon Upwelling in the
Northwest Arabian Sea during the Last 500,000 Years, Quat. Res., 43,
355–361, 1995.
Eugster, O., Gruber, N., Deutsch, C., Jaccard, S. L., and Payne, M. R.: The
dynamics of the marine nitrogen cycle across the last deglaciation,
Paleoceanography, 28, 116–129, 2013.
Fallah, B., Cubasch, U., Prömmel, K., and Sodoudi, S.: A numerical model
study on the behaviour of Asian summer monsoon and AMOC due to orographic
forcing of Tibetan Plateau, Clim. Dyn., 47, 1485–1495, 2016.
Findlater, J.: Observational aspects of low-level cross-equatorial jet stream
of Western Indian Ocean, Pure Appl. Geophys., 115, 1251–1262, 1977.
Fine, R. A., Smethie, W. M., Bullister, J. L., Rhein, M., Min, D.-H., Warner,
M. J., Poisson, A., and Weiss, R. F.: Decadal ventilation and mixing of
Indian Ocean waters, Deep-Sea Res. Pt. I, 55, 20–37, 2008.
Galbraith, E. D., Kienast, M., Albuquerque, A. L., Altabet, M. A., Batista,
F., Bianchi, D., Calvert, S. E., Contreras, S., Crosta, X., De Pol-Holz, R.,
Dubois, N., Etourneau, J., Francois, R., Hsu, T. C., Ivanochko, T., Jaccard,
S. L., Kao, S. J., Kiefer, T., Kienast, S., Lehmann, M. F., Martinez, P.,
McCarthy, M., Meckler, A. N., Mix, A., Mobius, J., Pedersen, T. F., Pichevin,
L., Quan, T. M., Robinson, R. S., Ryabenko, E., Schmittner, A., Schneider,
R., Schneider-Mor, A., Shigemitsu, M., Sinclair, D., Somes, C., Studer, A.
S., Tesdal, J. E., Thunell, R., Yang, J. Y. T., and Members, N. W. G.: The
acceleration of oceanic denitrification during deglacial warming, Nat.
Geosci., 6, 579–584, 2013.
Ganeshram, R. S., Pedersen, T. F., Calvert, S. E., and Murray, J. W.: Large
changes in ocean nutrient inventories from glacial to interglacial periods,
Nature, 376, 755–758, 1995.
Ganeshram, R. S., Pedersen, T. F., Calvert, S. E., McNeill, G. W., and
Fontugne, M. R.: Glacial-interglacial variability in denitrification in the
world's oceans: Causes and consequences, Paleoceanogr., 15, 361–376, 2000.
Ganeshram, R. S., Pedersen, T. F., Calvert, S. E., and Francois, R.: Reduced
nitrogen fixation in the glacial ocean inferred from changes in marine
nitrogen and phosphorus inventories, Nature, 414, 156–159, 2002.
Gaye-Haake, B., Lahajnar, N., Emeis, K.-C., Unger, D., Rixen, T., Suthhof,
A., Ramaswamy, V., Schulz, H., Paropkari, A. L., Guptha, M. V. S., and
Ittekkot, V.: Stable nitrogen isotopic ratios of sinking particles and
sediments from the northern Indian Ocean, Mar. Chem., 96, 243–255, 2005.
Gaye, B., Nagel, B., Dähnke, K., Rixen, T., and Emeis, K. C.: Evidence of
parallel denitrification and nitrite oxidation in the ODZ of the Arabian Sea
from paired stable isotopes of nitrate and nitrite Global Biogeochem. Cy.,
27, 1059–1071, https://doi.org/10.1002/2011GB004115, 2013a.
Gaye, B., Nagel, B., Dähnke, K., Rixen, T., Lahajnar, N., and Emeis,
K.-C.: Amino acid composition and δ15N of suspended matter in the
Arabian Sea: implications for organic matter sources and degradation,
Biogeosciences, 10, 7689–7702, https://doi.org/10.5194/bg-10-7689-2013,
2013b.
Gehlen, M., Bopp, L., Emprin, N., Aumont, O., Heinze, C., and Ragueneau, O.:
Reconciling surface ocean productivity, export fluxes and sediment
composition in a global biogeochemical ocean model, Biogeosciences, 3,
521–537, https://doi.org/10.5194/bg-3-521-2006, 2006.
Govil, P. and Naidu, P. D.: Evaporation-precipitation changes in the eastern
Arabian Sea for the last 68 ka: Implications on monsoon variability,
Paleoceanogr., 25, PA1210, https://doi.org/10.1029/2008PA001687, 2010.
Grootes, P. M. and Stuiver, M.: Oxygen 18/16 variability in Greenland snow
and ice with 10−3- to 105-year time resolution, J. Geophys.
Res.-Oceans, 102, 26455–26470, 1997.
Grosskopf, T., Mohr, W., Baustian, T., Schunck, H., Gill, D., Kuypers, M. M.
M., Lavik, G., Schmitz, R. A., Wallace, D. W. R., and LaRoche, J.: Doubling
of marine dinitrogen-fixation rates based on direct measurements, Nature,
488, 361–364, 2012.
Gruber, N.: The marine nitrogen cycle: Overview and challenges, in: Nitrogen
in the Marine Environment, 2nd edn., edited by: Capone, D. G., Bronk, D. A.,
Mulholland, M. R., and Carpenter, E., Academic Press, San Diego, 2008.
Gruber, N. and Galloway, J. N.: An earth-system perspective of the global
nitrogen cycle, Nature, 451, 293–296, 2008.
Gruber, N. and Sarmiento, J. L.: Global patterns of marine nitrogen fixation
and denitrification, Global Biogeochem. Cy., 11, 235–266, 1997.
Gupta, A. K., Anderson, D. M., and Overpeck, J. T.: Abrupt changes in the
Asian southwest monsoon during the Holocene and their links to the North
Atlantic Ocean, Nature, 421, 354–357, 2003.
Haake, B., Ittekkot, V., Rixen, T., Ramaswamy, V., Nair, R. R., and Curry, W.
B.: Seasonality and interannual variability of particle fluxes to the deep
Arabian Sea, Deep-Sea Res. Pt. I, 40, 1323–1344, 1993.
Herzschuh, U.: Palaeo-moisture evolution in monsoonal Central Asia during the
last 50,000 years, Quat. Sci. Rev., 25, 163–178, 2006.
Higginson, M. J., Altabet, M. A., Murray, D. W., Murray, R. W., and Herbert,
T. D.: Geochemical evidence for abrupt changes in relative strength of the
Arabian monsoons during a stadial/interstadial climate transition, Geochim.
Cosmochim. Ac., 68, 3807–3826, 2004.
Hong, Y. T., Hong, B., Lin, Q. H., Zhu, Y. X., Shibata, Y., Hirota, M.,
Uchida, M., Leng, X. T., Jiang, H. B., Xu, H., Wang, H., and Yi, L.:
Correlation between Indian Ocean summer monsoon and North Atlantic climate
during the Holocene, Earth Planet. Sc. Lett., 211, 371–380, 2003.
Hopcroft, P. O. and Valdes, P. J.: How well do simulated last glacial maximum
tropical temperatures constrain equilibrium climate sensitivity?, Geophys.
Res. Lett., 42, 5533–5539, 2015.
Huguet, C., Kim, J.-H., Sinninghe Damsté, J. S., and Schouten, S.:
Reconstruction of sea surface temperature variations in the Arabian Sea over
the last 23 kyr using organic proxies (TEX86 and U
Indermühle, A., Stocker, T., Joos, F., Fischer, H., Smith, H., Wahlen,
M., Deck, B., Mastroinanni, D., Tschumi, J., Blunier, T., Meyer, R., and
Staufer, B.: Holocene carbon-cycle dynamics based on CO2 trapped in ice
at Taylor Dome, Antarctica, Nature, 398, 121–126, 1999.
Isaji, Y., Kawahata, H., Ohkouchi, N., Ogawa, N. O., Murayama, M., Inoue, K.,
and Tamaki, K.: Varying responses to Indian monsoons during the past 220 kyr
recorded in deep-sea sediments in inner and outer regions of the Gulf of
Aden, J. Geophys. Res.-Oceans, 120, 7253–7270, 2015.
Ivanochko, T. S., Ganeshram, R. S., Brummer, G.-J. A., Ganssen, G., Jung, S.
J. A., Moreton, S. G., and Kroon, D.: Variations in tropical convection as an
amplifier of global climate change at the millennial scale, Earth Planet. Sc.
Lett., 235, 302–314, 2005.
Jansen, E., Overpeck, J., Briffa, K. R., Duplessy, J.-C., Joos, F.,
Masson-Delmotte, V., Olago, D., Otto-Bliesner, B., Peltier, W. R., Rahmstorf,
S., Ramesh, R., Raynaud, D., Rind, D., Solomina, O., R., V., and Zhang, D.:
Paleoclimate, in: Climate Change 2007: The Physical Science Basis,
Contribution of Working Group I to the Fourth Assessment Report of the
Intergovernmental Panel on Climate Change, edited by: Solomon, S., Qin, D.,
Manning, M., Chen, Z., Marquis, M., Averyt, K. B., M., T., and Miller, H. L.
M., Cambridge University Press, Cambridge, United Kingdom and New York, NY,
USA, 2007.
Jaeschke, A., Ziegler, M., Hopmanns, E. C., Reichart, G. J., Lourens, L. J.,
Schouten, S., and Sinninghe Damsté, J. S.: Molecular fossil evidence for
anaerobic ammonium oxidation in the Arabian Sea over the last glacial cycle,
Paleoceanography, 24, PA2202, https://doi.org/10.1029/2008PA001712, 2009.
Jensen, M. M., Lam, P., Revsbech, N. P., Nagel, B., Gaye, B., Jetten, M. S.
M., and Kuypers, M. M. M.: Intensive nitrogen loss over the Omani shelf due
to anammox coupled with dissimilatory nitrite reduction to ammonium, Int.
Soc. Microb. Ecol. J., 5, 1660–1670, https://doi.org/10.1038.ismej.2011.44, 2011.
Jin, L., Schneider, B., Park, W., Latif, M., Khon, V., and Zhang, X.: The
spatial-temporal patterns of Asian summer monsoon precipitation in response
to Holocene insolation change: a model-data synthesis, Quat. Sci. Rev., 85,
47–62, 2014.
Jung, S. J. A., Kroon, D., Ganssen, G., Peeters, F., and Ganeshram, R.:
Enhanced Arabian Sea intermediate water flow during glacial North Atlantic
cold phases, Earth Planet. Sc. Lett., 280, 220–228, 2009.
Kallel, N., Labeyrie, L. D., Juillet-Leclerc, A., and Duplessy, J.-C.: A deep
hydrological fron between intermediate and deep-water masses in the glacial
Indian Ocean, Nature, 333, 651–655, 1988.
Keeling, R. F. and Stephens, B. B.: Antarctic sea ice and the control of
Pleistocene climate instability, Paleoceanogr., 16, 112–131, 2001.
Kendall, C., Elliott, E. M., and Wankel, S. D.: Tracing anthropogenic inputs
of nitrogen to ecosystems, in: Stable Isotopes in Ecology and Environmental
Science, Michener, R. H. and Lajtha, K., Blackwell Publishing, 2007.
Kessarkar, P. M., Rao, V. P., Naqvi, S. W. A., Chivas, A. R., and Saino, T.:
Fluctuations in productivity and denitrification in the southeastern Arabian
Sea during the Late Quaternary, Curr. Sci., 99, 485–491, 2010.
Kessarkar, P. M., Purnachadra Rao, V., Naqvi, S. W. A., and Karapurkar, S.
G.: Variation in the Indian summer monsoon intensity during the
Bølling-Ållerød and Holocene, Paleoceanogr., 28, 413–425, 2013.
Khon, V. C., Park, W., Latif, M., Mokhov, I. I., and Schneider, B.: Response
of the hydrological cycle to orbital and greenhouse gas forcing, Geophys.
Res. Lett., 37, L19705, https://doi.org/10.1029/2010GL044377, 2010.
Khon, V. C., Park, W., Latif, M., Mokhov, I. I., and Schneider, B.: Tropical
circulation and hydrological cycle response to orbital forcing, Geophys. Res.
Lett., 39, L15708, https://doi.org/10.1029/2012GL052482, 2012
Kumar, S. P. and Prasad, T. G.: Formation and spreading of Arabian Sea
high-salinity water mass, J. Geophys. Res., 104, 1455–1464, 1999.
Le Mézo, P., Beaufort, L., Bopp, L., Braconnot, P., and Kageyama, M.:
From monsoon to marine productivity in the Arabian Sea: insights from glacial
and interglacial climates, Clim. Past, 13, 759–778,
https://doi.org/10.5194/cp-13-759-2017, 2017.
Leuschner, D. C. and Sirocko, F.: Orbital insolation forcing o fthe Indian
Monsoon – a motor for global climate changes?, Palaeogeogr. Palaeocl., 197,
83–95, 2003.
Levine, R. C. and Turner, A. G.: Dependence of Indian monsoon rainfall on
moisture fluxes across the Arabian Sea and the impact of coupled model sea
surface temperature biases, Clim. Dynam., 38, 2167–2190, 2012.
Locarnini, R. A., Mishonov, A. V., Antonov, J. I., Boyer, T. P., Garcia, H.
E., Baranova, O. K., Zweng, M. M., Paver, C. R., Reagan, J. R., Johnson, D.
R., Hamilton, M., and Seidov, D.: World Ocean Atlas 2013, Volume 1:
Temperature, in: NOAA Atlas NESDIS 73, edited by: Levitus, S. and Mishonov,
A., US Government Printing Office, Washington, DC, 2013.
Lückge, A., Deplazes, G., Schulz, H., Scheeder, G., Suckow, A., Kasten,
S., and Haug, G. H.: Impact of Indus River discharge on productivity and
preservation of organic carbon in the Arabian Sea over the twentieth century,
Geology, 40, 399–402, https://doi.org/10.1130/G32608.1, 2012.
Madec, G.: NEMO ocean engine, Note du Pole de modelisation 27, Institut
Pierre-Simon Laplace, 91 pp., 2008.
Mahesh, B. S. and Banakar, V. K.: Change in the intensity of low-salinity
water inflow from the Bay of Bengal into the Eastern Arabian Sea from the
Last Glacial Maximum to the Holocene: Implications for monsoon variations,
Paleogeogr. Paleocl., 397, 31–37, 2014.
Marcott, S. A., Shakun, J. D., Clark, P. U., and Mix, A. C.: A Reconstruction
of Regional and Global Temperature for the Past 11,300 Years, Science, 339,
1198–1201, https://doi.org/10.1126/science.1228026 , 2013.
Martin, T. S. and Casciotti, K. L.: Paired N and O isotopic analysis of
nitrate and nitrite in the Arabian Sea oxygen deficient zone, Deep-Sea Res.
Pt. I, 121, 121–131, 2017.
Menzel, P., Gaye, B., Mishra, P. K., Anoop, A., Basavaiah, N., Marwan, N.,
Plessen, B., Prasad, S., Riedel, N., Stebich, M., and Wiesner, M. G.: Linking
Holocene drying trends from Lonar Lake in monsoonal central India to North
Atlantic cooling events, Palaeogeogr. Palaeocl., 410, 164–178, 2014.
Möbius, J., Gaye, B., Lahajnar, N., Bahlmann, E., and Emeis, K.-C.:
Influence of diagenesis on sedimentary δ15N in the Arabian Sea over
the last 130 kyr, Mar. Geol., 284, 127–138,
https://doi.org/10.1016/j.margeo.2011.03.13, 2011.
Montoya, J. P. and Voss, M.: Nitrogen cycling in suboxic waters: isotopic
signatures of nitrogen transformation in the Arabian Sea oxygen minimum zone,
in: Past and Present Water Column Anoxia, edited by: Neretin, L. N.,
Springer, Amsterdam, 2006.
Mooley, D. A. and Parthasarathy, B.: Fluctuations in All-India summer monsoon
rainfall during 1871–1978, Clim. Change, 6, 287–301, 1984.
Morrison, J. M.: Inter-monsoonal changes in the T-S properties of the
near-surface waters of the northern Arabian Sea, Geophys. Res. Lett., 24,
2553–2556, 1997.
Morrison, J. M., Codispoti, L. A., Gaurin, S., Jones, B., Manghnani, V., and
Zheng, Z.: Seasonal variations of hydrographic and nutrient fields during the
US JGOFS Arabian Sea Process Study, Deep-Sea Res. Pt. II, 45, 2053–2101,
1998.
Morrison, J. M., Codispoti, L. A., Smith, S. L., Wishner, K., Flagg, C.,
Gardner, W. D., Gaurin, S., Naqvi, S. W. A., Manghnani, V., Prosperie, L.,
and Gundersen, J. S.: The oxygen minimum zone in the Arabian Sea during 1995,
Deep-Sea Res. Pt. II, 46, 1903–1931, 1999.
Müller, P. J. and Suess, E.: Productivity, sedimentation rate, and
sedimentary organic matter in the oceans – I. Organic carbon preservation,
Deep-Sea Res., 26, 1347–1362, 1979.
Munz, P. M., Siccha, M., Luckge, A., Boll, A., Kucera, M., and Schulz, H.:
Decadal-resolution record of winter monsoon intensity over the last two
millennia from planktic foraminiferal assemblages in the northeastern Arabian
Sea, Holocene, 25, 1756–1771, 2015.
Munz, P. M., Steinke, S., Böll, A., Lückge, A., Groeneveld, J.,
Kucera, M., and Schulz, H.: Decadal resolution record of Oman upwelling
indicates solar forcing of the Indian summer monsoon (9–6 ka), Clim. Past,
13, 491–509, https://doi.org/10.5194/cp-13-491-2017, 2017.
Nagel, B., Emeis, K.-C., Flohr, A., Rixen, T., Schlarbaum, T., Mohrholz, V.,
and van der Plas, A.: N-cycling and balancing of the N-deficit generated in
the oxygen minimum zone over the Namibian shelf – An isotope-based approach,
J. Geophys. Res.–Biogeo., 118, 361–371, 2013.
Naidu, P. D. and Govil, P.: New evidence on the sequence of deglacial warming
in the tropical Indian Ocean, J. Quat. Sci., 25, 1138–1143, 2010.
Naidu, P. D., Singh, A. D., Ganeshram, R., and Bharti, S. K.: Abrupt
climate-induced changes in carbonate burial in the Arabian Sea: Causes and
consequences, Geochem. Geophys. Geosyst., 15, 1398–1406, 2014.
Naik, D. K., Saraswat, R., Lea, D. W., Kurtarkar, S. R., and Mackensen, A.:
Last glacial-interglacial productivity and associated changes in the eastern
Arabian Sea, Paleogeogr. Paleocl., 483, 147–156, 2017.
Nair, R. R., Ittekkot, V., Manganini, S., Ramaswamy, V., Haake, B., Degens,
E. T., Desai, B. N., and Honjo, S.: Increased particle fluxes to the oceans
related to monsoons, Nature, 338, 749–751, 1989.
Naqvi, S. W. A., Yoshinari, T., Brandes, J. A., Devol, A. H., Jayakumar, D.
A., Narvekar, P. V., Altabet, M. A., and Codispoti, L. A.: Nitrogen isotopic
studies in the suboxic Arabian Sea, P. Indian As.-Earth, 107, 367–378, 1998.
Naqvi, S. W. A., Naik, H., and Narvekar, P. V.: The Arabian Sea, in:
Biogeochemistry in Marine Systems, edited by: Black, K. and Shimmield, G.,
Academic Press, Sheffield, 2003.
Naqvi, S. W. A., Voss, M., and Montoya, J. P.: Recent advances in the
biogeochemistry of nitrogen in the ocean, Biogeosciences, 5, 1033–1041,
2008.
Olson, D. B., Hitchcock, G. L., Fine, R. A., and Warren, B. A.: Maintenance
of the low-oxygen layer in the central Arabian Sea, Deep-Sea Res. Pt. II, 40,
673–685, 1993.
Overpeck, J., Anderson, D., Trumbore, S., and Prell, W.: The southwest Indian
Monsoon over the last 18 000 years, Clim. Dynam., 12, 213–225, 1996.
Park, W. and Latif, M.: Multidecadal and multicentennial variability of the
meridional overturning circulation, Geophys. Res. Lett., 35, L22703,
https://doi.org/10.1029/2008GL035779, 2008.
Park, W., Keenlyside, N., Latif, M., Ströh, A., Redler, R., Roeckner, E.,
and Madec, G.: Tropical Pacific climate and its response to global warming in
the Kiel Climate Model, J. Climate, 22, 71–92, 2009.
Peterse, F., Martínez-García, A., Zhou, B., Beets, C. J., Prins, M.
A., Zheng, H., and Eglinton, T. I.: Molecular records of continental air
temperature and monsoon precipitation variability in East Asia spanning the
past 130,000 years, Quat. Sci. Rev., 83, 76–82, 2014.
Pichevin, L., Bard, E., Martinez, P., and Billy, I.: Evidence of ventilation
changes in the Arabian Sea during the late Quaternary: Implication for
denitrification and nitrous oxide emission, Global Biogeochem. Cy., 21,
GB4008, https://doi.org/10.1029/2006GB002852, 2007.
Ponton, C., Giosan, L., Eglinton, G., Fuller, D. Q., Johnson, J. E., Kumar,
P. S., and Collett, T. S.: Holocene aridification of India, Geophys. Res.
Lett., 39, L03704, https://doi.org/10.1029/2011GL050722, 2012.
Pourmand, A., Marcantonio, F., Bianchi, T. S., Canuel, E. A., and Waterson,
E. J.: A 28-ka history of sea surface temperature, primary productivity and
planktonic community variability in the western Arabian Sea, Paleoceanogr.,
22, 1–14, 2007.
Prasad, S., Anoop, A., Riedel, N., Sarkar, S., Menzel, P., Basavaiah, N.,
Krishnan, R., Fuller, D., Plessen, B., Gaye, B., Röhl, U., Wilkes, H.,
Sachse, D., Sawant, R., Wiesner, M. G., and Stebich, M.: Prolonged monsoon
droughts and links to Indo-Pacific warm pool: A Holocene record from Lonar
Lake, central India, Earth Planet. Sc. Lett., 391, 171–182, 2014.
Prasad, T. G. and Ikeda, M.: The wintertime water mass formation in the
northern Arabian Sea: A model study, J. Phys. Oceanogr., 32, 1028–1040,
2002.
Prasad, T. G., Ikeda, M., and Kumar, S. P.: Seasonal spreading of the Persian
Gulf water mass in the Arabian Sea, J. Geophys. Res., 106, 17059–17071,
2001.
Prins, M. A.: Pelagic, hemigelagic and turbidite deposition in the Arabian
Sea during the Late Quaternary, Geologica Ultraiectina, no. 168, 192 pp.,
1999.
Regenberg, M., Regenberg, A., Garbe-Schonberg, D., and Lea, D. W.: Global
dissolution effects on planktonic foraminiferal Mg ∕ Ca ratios controlled
by the calcite-saturation state of bottom waters, Paleoceanogr., 29,
127–142, 2014.
Reichart, G. J., Dden Dulk, M., Visser, H. J., van der Weijden, C. H., and
Zachariasse, W. J.: A 225 kyr record of dust supply, paleoproductivity and
the oxygen minimum zone from the Murray Ridge (northern Arabian Sea),
Palaeogeogr. Palaeocl., 134, 149–169, 1997.
Reichart, G. J., Lourens, L. J., and Zchariasse, W. J.: Temporal variability
in the northern Arabian Sea oxygen minimum zone (OMZ) during the last 225,000
years, Paleoceanogr., 13, 607–621, 1998.
Reichart, G. J., Brinkhuis, H., Huiskamp, F., and Zachariasse, W. J.:
Hyperstratification following glacial overturning events in the northern
Arabian Sea, Paleoceanogr., 19, PA2013, https://doi.org/10.1029/2003PA000900, 2004.
Ren, H., Sigman, D. M., Chen, M.-T., and Kao, S.-J.: Elevated
foraminifera-bound nitrogen isotopic composition during the last ice age in
the South China Sea and its global and regional implications, Global
Biogeochem. Cy., 26, GB1031, https://doi.org/10.1029/2010GB004020, 2012.
Resplandy, L., Lévy, M., Bopp, L., Echevin, V., Pous, S., Sarma, V. V. S.
S., and Kumar, D.: Controlling factors of the oxygen balance in the Arabian
Sea's OMZ, Biogeosciences, 9, 5095–5109, https://doi.org/10.5194/bg-9-5095-2012, 2012.
Rickaby, R. E. M. and Elderfield, H.: Evidence from the high-latitude North
Atlantic for variations in Antarctic Intermediate water flow during the last
deglaciation, Geochem. Geophy. Geosy., 6, Q05001, https://doi.org/10.1029/2004GC000858,
2005.
Rixen, T., Haake, B., Ittekkot, V., Guptha, M. V. S., Nair, R. R., and
Schlussel, P.: Coupling between SW monsoon-related surface and deep ocean
processes as discerned from continuous particle flux measurements and
correlated satellite data, J. Geophys. Res.-Oceans, 101, 28569–28582, 1996.
Rixen, T., Guptha, M. V. S., and Ittekkot, V.: Deep ocean fluxes and their
link to surface ocean processes and the biological pump, Progr. Oceanogr.,
65, 240–259, 2005.
Rixen, T., Baum, A., Gaye, B., and Nagel, B.: Seasonal and interannual
variations in the nitrogen cycle in the Arabian Sea, Biogeosciences, 11,
5733–5747, https://doi.org/10.5194/bg-11-5733-2014, 2014.
Roeckner, E., Brokopf, R., Esch, M., Giorgetta, M., Hagemann, S.,
Kornblüh, L., Manzini, E., Schlese, U., and Schulzweida, U.: The
atmospheric general circulation model ECHAM5, Part I: Model description,
Report no. 349, Max-Planck-Institute für Meteorologie, Hamburg, Germany,
2003.
Rohling, E. J. and Zachariasse, W. J.: Red Sea outflow during the last
glacial maximum, Quat. Int., 31, 77–83, 1996.
Ronge, T. A., Steph, S., Tiedemann, R., Prange, M., Merkel, U., Nurnberg, D.,
and Kuhn, G.: Pushing the boundaries: Glacial/interglacial variability of
intermediate and deep waters in the southwest Pacific over the last 350,000
years, Paleoceanogr., 30, 23–38, 2015.
Rostek, F., Bard, E., Beaufort, L., Sonzogni, C., and Ganssen, G.: Sea
surface temperature and productivity records for the past 240 kyr in the
Arabian Sea, Deep-Sea Res. Pt. II, 44, 1461–1480, 1997.
Salau, O. R., Schneider, B., Park W., Khon, V., and Latif, M.: Modelling the
ENSO impact of orbitally induced mean state climate changes, J. Geophys.
Res.-Oceans, 117, C05043, https://doi.org/10.1029/2011JC007742, 2012.
Saraswat, R., Lea, D. W., Nigam, R., Mackensen, A., and Naik, D. K.:
Deglaciation in the tropical Indian Ocean driven by interplay between the
regional monsoon and global teleconnections, Earth Planet. Sc. Lett., 375,
166–175, 2013.
Saraswat, R., Nigam, R., Weldeab, S., Mackensen, A., and Naidu, P. D.: A
first look at past sea surface temperatures in the equatorial Indian Ocean
from Mg ∕ Ca in foraminifera, Geophys. Res. Lett., 32, L24605,
https://doi.org/10.1029/2005GL024093, 2005.
Sarma, V. V. S. S.: An evaluation of physical and biogeochemical processes
regulating perennial suboxic conditions in the water column of the Arabian
Sea, Global Biogeochem. Cy., 16, 1082, https://doi.org/10.1029/2001GB001461, 2002.
Schmiedl, G. and Leuschner, D. C.: Oxygenation changes in the deep western
Arabian Sea during the last 190,000 years: Productivity versus deep water
circulation, Paleoceanogr., 20, PA2008, https://doi.org/10.1029/2004PA001044, 2005.
Schmittner, A. and Somes, C. J.: Complementary constraints from carbon (C-13)
and nitrogen (N-15) isotopes on the glacial ocean's soft-tissue biological
pump, Paleoceanogr., 31, 669–693, 2016.
Schneider, B., Leduc, G., and Park, W.: Disentangling seasonal signals in
Holocene climate trends by satellite-model-proxy integration, Paleocenogr.,
25, PA4217, https://doi.org/10.1029/2009PA001893, 2010.
Schott, F. A. and McCreary, J. P.: The monsoon circulation of the Indian
Ocean, Prog. Oceanogr., 51, 1–123, https://doi.org/10.1016/S0079-6611(01)00083-0, 2001.
Schott, F. A., Dengler, M., and Schoenefeldt, R.: The shallow overturning
circulation of the Indian Ocean, Prog. Oceanogr., 53, 57–103, 2002.
Schulte, S. and Muller, P. J.: Variations of sea surface temperature and
primary productivity during Heinrich and Dansgaard-Oeschger events in the
northeastern Arabian Sea, Geo-Mar. Lett., 21, 168–175, 2001.
Schulte, S., Rostek, F., Bard, E., Rullkotter, J., and Marchal, O.:
Variations of oxygen-minimum and primary productivity recorded in sediments
of the Arabian Sea, Earth Planet. Sc. Lett., 173, 205–221, 1999a.
Schulte, S., Rostek, F., Bard, E., Rullkötter, J., and Marchal, O.:
Variations of oxygen-minimum and primary productivity recorded in sediments
of the Arabian Sea, Earth Planet. Sc. Lett., 173, 205–221, 1999b.
Shankar, D. and Shetye, S. R.: Why is mean sea level along the Indian coast
higher in the Bay of Bengal than in the Arabian Sea?, Geophys. Res. Lett.,
28, 563–565, 2001.
Shetye, S. R., Gouveia, A. D., Shenoi, S. S. C., Sundar, D., Michael, G. S.,
Almeida, A. M., and Santanam, K.: Hydrography and circulation off the west
coast of India during the southwest monsoon 1987, J. Mar. Res., 48, 359–378,
1990.
Siddall, M., Rohling, E. J., Almogi-Labin, A., Hemleben, C., Meischner, D.,
Schmelzer, I., and Smeed, D. A.: Sea-level fluctuations during the last
glacial cycle, Nature, 423, 853–858, 2003.
Sigman, D., Karsh, K. L., and Casciotti, K. L.: Ocean process tracers:
Nitrogen isotopes in the ocean, in: Encyclopedia of Ocean Sciences, edited
by: Steele, J. H., Turekian, K. K., and Thorpe, S. A., Academic Press,
London, 2009.
Sirocko, F., Sarnthein, M., Lange, H., and Erlenkeuser, H.: Atmospheric
summer circulation and coastal upwelling in the Arabian Sea during the
Holocene and the last glaciation, Quat. Res., 36, 72–93, 1991.
Sirocko, F., Sarnthein, M., Erlenkeuser, H., Lange, H., Arnold, M., and
Duplessy, J. C.: Century-scale events in monsoonal climate over the past
24,000 years, Nature, 364, 322–324, 1993.
Sirocko, F., Garbe-Schönberg, D., and Devey, C.: Processes controlling
trace element geochemistry of Arabian Sea sediments during the last 25,000
years, Global Planet. Change, 26, 217–303, 2000.
Somes, C. J., Schmittner, A., Muglia, J., and Oschlies, A.: A
Three-Dimensional Model of the Marine Nitrogen Cycle during the Last Glacial
Maximum Constrained by Sedimentary Isotopes, Front. Mar. Sci., 4, 108,
https://doi.org/10.3389/fmars.2017.00108, 2017.
Sonzogni, C., Bard, E., Rostek, F., Dollfus, D., Rosell-Melé, A., and
Eglinton, G.: Temperature and Salinity Effects on Alkenone Ratios Measured in
Surface Sediments from the Indian Ocean, Quat. Res., 47, 344–355, 1997a.
Sonzogni, C., Bard, E., Rostek, F., Lafont, R., Rosell-Mele, A., and
Eglinton, G.: Core-top calibration of the alkenone index vs sea surface
temperature in the Indian Ocean, Deep-Sea Res. Pt. II, 44, 1445–1460, 1997b.
Stern, J. V. and Lisiecki, L. E.: Termination 1 timing in radiocarbon-dated
regional benthic δ18O stacks, Paleoceanogr., 29, 1127–1142, 2014.
Suresh, I., Vialard, J., Izumo, T., Lengaigne, M., Han, W., McCreary, J., and
Muraleedharan, P. M.: Dominant role of winds near Sri Lanka in driving
seasonal sea level variations along the west coast of India, Geophys. Res.
Lett., 43, 7028–7035, 2016.
Suthhof, A., Ittekkot, V., and Gaye-Haake, B.: Millennial-scale oscillation
of denitrification intensity in the Arabian Sea during the late Quaternary
and its potential influence on atmospheric N2O and global climate,
Global Biogeochem. Cy., 15, 637–650, 2001.
Tierney, J. E., Pausata, F. S. R., and deMenocal, P.: Deglacial Indian
monsoon failure and North Atlantic stadials linked by Indian Ocean surface
cooling, Nat. Geosci., 9, 46–50, 2016.
Tiwari, M., Ramesh, R., Bhushan, R., Sheshshayee, M. S., Somayajulu, B. L.
K., Jull, A. J. T., and Burr, G. S.: Did the Indo-Asian summer monsoon
decrease during the Holocene following insolation?, J. Quat. Sci., 25,
1179–1188, 2010.
Tiwari, M., Nagoji, S. S., and Ganeshram, R. S.: Multi-centennial scale SST
and Indian summer monsoon precipitation variability since the mid-Holocene
and its nonlinear response to solar activity, Holocene, 25, 1415–1424, 2015.
Vijith, V., Vinayachandran, P. N., Thushara, V., Amol, P., Shankar, D., and
Anil, A. C.: Consequences of inhibition of mixed-layer deepening by the West
India Coastal Current for winter phytoplankton bloom in the northeastern
Arabian Sea, J. Geophys. Res.-Oceans, 121, 6583–6603, 2016.
Voss, M., Deutsch, B., Elmgren, R., Humborg, C., Kuuppo, P., Pastuszak, M.,
Rolff, C., and Schulte, U.: Source identification of nitrate by means of
isotopic tracers in the Baltic Sea catchments, Biogeosciences, 3, 663–676,
https://doi.org/10.5194/bg-3-663-2006, 2006.
Waelbroeck, C., Levi, C., Duplessy, J. C., Labeyrie, L., Michel, E., Cortijo,
E., Bassinot, F., and Guichard, F.: Distant origin of circulation changes in
the Indian Ocean during the last deglaciation, Earth Planet. Sc. Lett., 243,
244–251, 2006.
Walker, M. J. C., Berkelhammer, M., Bjorck, S., Cwynar, L. C., Fisher, D. A.,
Long, A. J., Lowe, J. J., Newnham, R. M., Rasmussen, S. O., and Weiss, H.:
Formal subdivision of the Holocene Series/Epoch: a Discussion Paper by a
Working Group of INTIMATE (Integration of ice-core, marine and terrestrial
records) and the Subcommission on Quaternary Stratigraphy (International
Commission on Stratigraphy), J. Quat. Sci., 27, 649–659, 2012.
Ward, B. B., Devol, A. H., Rich, J. J., Chang, B. X., Bulow, S. E., Naik, H.,
Pratihary, A., and Jayakumar, A.: Denitrification as the dominant nitrogen
loss process in the Arabian Sea, Nature, 461, 78–81, 2009.
Wiggert, J. D., Hood, R. R., Banse, K., and Kindle, J. C.: Monsoon-driven
biogeochemical processes in the Arabian Sea, Prog. Oceanogr., 65, 176–213,
2005.
Yoshinari, T., Altabet, M. A., Naqvi, S. W. A., Codispoti, L., Jayakumar, A.,
Kuhland, M., and Devol, A.: Nitrogen and oxygen isotopic composition of
N2O from suboxic waters of the eastern tropical North Pacific and the
Arabian Sea – measurement by continuous-flow isotope-ratio monitoring, Mar.
Chem., 56, 253–264, 1997.
You, Y. Z.: Seasonal variations of thermocline circulation and ventilation in
the Indian Ocean, J. Geophys. Res.-Oceans, 102, 10391–10422, 1998.
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Short summary
The Arabian Sea has one of the most severe oxygen minima of the world's oceans between about 100 and 1200 m of water depth and is therefore a major oceanic nitrogen sink. Stable nitrogen isotopic ratios in sediments record changes in oxygen concentrations and were studied for the last 25 kyr. Oxygen concentrations dropped at the end of the last glacial and became further reduced during the Holocene, probably due to the increasing age of the low-oxygen water mass.
The Arabian Sea has one of the most severe oxygen minima of the world's oceans between about 100...
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