Articles | Volume 19, issue 3
https://doi.org/10.5194/bg-19-807-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-19-807-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Feb 2022
Research article |
| 10 Feb 2022
| 10 Feb 2022
What can we learn from amino acids about oceanic organic matter cycling and degradation?
Birgit Gaye
CORRESPONDING AUTHOR
Institute for Geology, Universität Hamburg, 20146 Hamburg, Germany
Niko Lahajnar
Institute for Geology, Universität Hamburg, 20146 Hamburg, Germany
Natalie Harms
Institute for Geology, Universität Hamburg, 20146 Hamburg, Germany
Sophie Anna Luise Paul
Department of Physics and Earth Sciences, Jacobs University Bremen, 28759 Bremen, Germany
GEOMAR, Helmholtz-Zentrum für Ozeanforschung, 24148 Kiel, Germany
Tim Rixen
Institute for Geology, Universität Hamburg, 20146 Hamburg, Germany
Leibniz Centre for Tropical Marine Research (ZMT), 28359 Bremen, Germany
Kay-Christian Emeis
Institute for Geology, Universität Hamburg, 20146 Hamburg, Germany
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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
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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
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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.
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
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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
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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.
Celeste Sánchez-Noguera, Ines Stuhldreier, Jorge Cortés, Carlos Jiménez, Álvaro Morales, Christian Wild, and Tim Rixen
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Birgit Gaye, Anna Böll, Joachim Segschneider, Nicole Burdanowitz, Kay-Christian Emeis, Venkitasubramani Ramaswamy, Niko Lahajnar, Andreas Lückge, and Tim Rixen
Biogeosciences, 15, 507–527, https://doi.org/10.5194/bg-15-507-2018, https://doi.org/10.5194/bg-15-507-2018, 2018
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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.
Valerie Menke, Werner Ehrmann, Yvonne Milker, Swaantje Brzelinski, Jürgen Möbius, Uwe Mikolajewicz, Bernd Zolitschka, Karin Zonneveld, Kay Christian Emeis, and Gerhard Schmiedl
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Preprint withdrawn
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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
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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.
Nele Tim, Eduardo Zorita, Birgit Hünicke, Xing Yi, and Kay-Christian Emeis
Ocean Sci., 12, 807–823, https://doi.org/10.5194/os-12-807-2016, https://doi.org/10.5194/os-12-807-2016, 2016
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The impact of external climate forcing on the four eastern boundary upwelling systems is investigated for the recent past and future. Under increased radiative forcing, upwelling-favourable winds should strengthen due to unequal heating of land and oceans. However, coastal upwelling simulated in ensembles of climate simulations do not show any imprint of external forcing neither for the past millennium nor for the future, with the exception of the strongest future scenario.
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
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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
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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.
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
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
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Climate and geology overwrite land use effects on soil organic nitrogen cycling on a continental scale
Compositions of dissolved organic matter in the ice-covered waters above the Aurora hydrothermal vent system, Gakkel Ridge, Arctic Ocean
Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region)
Microbial labilization and diversification of pyrogenic dissolved organic matter
Bacterial and eukaryotic intact polar lipids point to in situ production as a key source of labile organic matter in hadal surface sediment of the Atacama Trench
Bacteriohopanetetrol-x: constraining its application as a lipid biomarker for marine anammox using the water column oxygen gradient of the Benguela upwelling system
Active and passive fluxes of carbon, nitrogen, and phosphorus in the northern South China Sea
Cyanobacteria net community production in the Baltic Sea as inferred from profiling pCO2 measurements
Reviews and syntheses: Heterotrophic fixation of inorganic carbon – significant but invisible flux in environmental carbon cycling
Revised fractional abundances and warm-season temperatures substantially improve brGDGT calibrations in lake sediments
Archaeal intact polar lipids in polar waters: a comparison between the Amundsen and Scotia seas
Reproducible determination of dissolved organic matter photosensitivity
Technical note: Uncovering the influence of methodological variations on the extractability of iron-bound organic carbon
Anthropocene climate warming enhances autochthonous carbon cycling in an upland Arctic lake, Disko Island, West Greenland
Novel hydrocarbon-utilizing soil mycobacteria synthesize unique mycocerosic acids at a Sicilian everlasting fire
Alkenone isotopes show evidence of active carbon concentrating mechanisms in coccolithophores as aqueous carbon dioxide concentrations fall below 7 µmol L−1
Seasonal variability and sources of in situ brGDGT production in a permanently stratified African crater lake
Sediment release of dissolved organic matter to the oxygen minimum zone off Peru
Better molecular preservation of organic matter in an oxic than in a sulfidic depositional environment: evidence from Thalassiphora pelagica (Dinoflagellata, Eocene) cysts
Assessing branched tetraether lipids as tracers of soil organic carbon transport through the Carminowe Creek catchment (southwest England)
The nonconservative distribution pattern of organic matter in the Rajang, a tropical river with peatland in its estuary
Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication
High-pH and anoxic conditions during soil organic matter extraction increases its electron-exchange capacity and ability to stimulate microbial Fe(III) reduction by electron shuttling
Sterol preservation in hypersaline microbial mats
Structural elucidation and environmental distributions of butanetriol and pentanetriol dialkyl glycerol tetraethers (BDGTs and PDGTs)
Distribution and degradation of terrestrial organic matter in the sediments of peat-draining rivers, Sarawak, Malaysian Borneo
Validation of carbon isotope fractionation in algal lipids as a pCO2 proxy using a natural CO2 seep (Shikine Island, Japan)
Composition and cycling of dissolved organic matter from tropical peatlands of coastal Sarawak, Borneo, revealed by fluorescence spectroscopy and parallel factor analysis
Latitudinal variations in δ30Si and δ15N signatures along the Peruvian shelf: quantifying the effects of nutrient utilization versus denitrification over the past 600 years
Diapycnal dissolved organic matter supply into the upper Peruvian oxycline
Composition and vertical flux of particulate organic matter to the oxygen minimum zone of the central Baltic Sea: impact of a sporadic North Sea inflow
Main drivers of transparent exopolymer particle distribution across the surface Atlantic Ocean
Biochemical and structural controls on the decomposition dynamics of boreal upland forest moss tissues
Mak A. Saito, Jaclyn K. Saunders, Matthew R. McIlvin, Erin M. Bertrand, John A. Breier, Margaret Mars Brisbin, Sophie M. Colston, Jaimee R. Compton, Tim J. Griffin, W. Judson Hervey, Robert L. Hettich, Pratik D. Jagtap, Michael Janech, Rod Johnson, Rick Keil, Hugo Kleikamp, Dagmar Leary, Lennart Martens, J. Scott P. McCain, Eli Moore, Subina Mehta, Dawn M. Moran, Jaqui Neibauer, Benjamin A. Neely, Michael V. Jakuba, Jim Johnson, Megan Duffy, Gerhard J. Herndl, Richard Giannone, Ryan Mueller, Brook L. Nunn, Martin Pabst, Samantha Peters, Andrew Rajczewski, Elden Rowland, Brian Searle, Tim Van Den Bossche, Gary J. Vora, Jacob R. Waldbauer, Haiyan Zheng, and Zihao Zhao
Biogeosciences, 21, 4889–4908, https://doi.org/10.5194/bg-21-4889-2024, https://doi.org/10.5194/bg-21-4889-2024, 2024
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The ability to assess the functional capabilities of microbes in the environment is of increasing interest. Metaproteomics, the ability to measure proteins across microbial populations, has been increasing in capability and popularity in recent years. Here, an international team of scientists conducted an intercomparison study using samples collected from the North Atlantic Ocean and observed consistency in the peptides and proteins identified, their functions, and their taxonomic origins.
Devika Varma, Laura Villanueva, Nicole J. Bale, Pierre Offre, Gert-Jan Reichart, and Stefan Schouten
Biogeosciences, 21, 4875–4888, https://doi.org/10.5194/bg-21-4875-2024, https://doi.org/10.5194/bg-21-4875-2024, 2024
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Archaeal hydroxylated tetraether lipids are increasingly used as temperature indicators in marine settings, but the factors influencing their distribution are still unclear. Analyzing membrane lipids of two thaumarchaeotal strains showed that the growth phase of the cultures does not affect the lipid distribution, but growth temperature profoundly affects the degree of cyclization of these lipids. Also, the abundance of these lipids is species-specific and is not influenced by temperature.
William Kew, Allison Myers-Pigg, Christine H. Chang, Sean M. Colby, Josie Eder, Malak M. Tfaily, Jeffrey Hawkes, Rosalie K. Chu, and James C. Stegen
Biogeosciences, 21, 4665–4679, https://doi.org/10.5194/bg-21-4665-2024, https://doi.org/10.5194/bg-21-4665-2024, 2024
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Natural organic matter (NOM) is often studied via Fourier transform mass spectrometry (FTMS), which identifies organic molecules as mass spectra peaks. The intensity of peaks is data that is often discarded due to technical concerns. We review the theory behind these concerns and show they are supported empirically. However, simulations show that ecological analyses of NOM data that include FTMS peak intensities are often valid. This opens a path for robust use of FTMS peak intensities for NOM.
Adam J. Fagan, Tatsuro Tanioka, Alyse A. Larkin, Jenna A. Lee, Nathan S. Garcia, and Adam C. Martiny
Biogeosciences, 21, 4239–4250, https://doi.org/10.5194/bg-21-4239-2024, https://doi.org/10.5194/bg-21-4239-2024, 2024
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Climate change is anticipated to influence the biological pump by altering phytoplankton nutrient distribution. In our research, we collected measurements of particulate matter concentrations during two oceanographic field studies. We observed systematic variations in organic matter concentrations and ratios across the Atlantic Ocean. From statistical modeling, we determined that these variations are associated with differences in the availability of essential nutrients for phytoplankton growth.
Sebastian I. Cantarero, Edgart Flores, Harry Allbrook, Paulina Aguayo, Cristian A. Vargas, John E. Tamanaha, J. Bentley C. Scholz, Lennart T. Bach, Carolin R. Löscher, Ulf Riebesell, Balaji Rajagopalan, Nadia Dildar, and Julio Sepúlveda
Biogeosciences, 21, 3927–3958, https://doi.org/10.5194/bg-21-3927-2024, https://doi.org/10.5194/bg-21-3927-2024, 2024
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Our study explores lipid remodeling in response to environmental stress, specifically how cell membrane chemistry changes. We focus on intact polar lipids in a phytoplankton community exposed to diverse stressors in a mesocosm experiment. The observed remodeling indicates acyl chain recycling for energy storage in intact polar lipids during stress, reallocating resources based on varying growth conditions. This understanding is essential to grasp the system's impact on cellular pools.
Mengke Wang, Peng Zhang, Huishan Li, Guisen Deng, Deliang Kong, Sifang Kong, and Junjian Wang
Biogeosciences, 21, 2691–2704, https://doi.org/10.5194/bg-21-2691-2024, https://doi.org/10.5194/bg-21-2691-2024, 2024
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We developed and applied complementary analyses to characterize molecular-level carbon traits for water-grown and soil-grown fine roots. The adaptive strategy of developing more labile carbon in water-grown roots accelerated root decomposition and counteracted the decelerated effects of anoxia on decomposition, highlighting an indirect effect of environmental change on belowground carbon cycling.
Zhe-Xuan Zhang, Edith Parlanti, Christelle Anquetil, Jérôme Morelle, Anniet M. Laverman, Alexandre Thibault, Elisa Bou, and Arnaud Huguet
Biogeosciences, 21, 2227–2252, https://doi.org/10.5194/bg-21-2227-2024, https://doi.org/10.5194/bg-21-2227-2024, 2024
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Bacterial tetraethers have important implications for palaeoclimate reconstruction. However, fundamental understanding of how these lipids are transformed from land to sea and which environmental factors influence their distributions is lacking. Here, we investigate the sources of brGDGTs and brGMGTs and the factors controlling their distributions in a large dataset (n=237). We propose a novel proxy (RIX) to trace riverine runoff, which is applicable in modern systems and in paleorecord.
Chiara Santinelli, Silvia Valsecchi, Simona Retelletti Brogi, Giancarlo Bachi, Giovanni Checcucci, Mirco Guerrazzi, Elisa Camatti, Stefano Caserini, Arianna Azzellino, and Daniela Basso
EGUsphere, https://doi.org/10.5194/egusphere-2024-625, https://doi.org/10.5194/egusphere-2024-625, 2024
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To the best of our knowledge, there is no study investigating the impact of ocean liming on dissolved organic matter (DOM) dynamics. Given the central role played by DOM in the microbial loop, a change in its concentration and/or quality has a cascading effect the entire marine ecosystem. Our data clearly show that the addition of hydrated lime cause a reduction in DOM concentration and a change in its quality. The observed effects, detectable at pH 9, becomes significant at pH 10.
Youcheng Bai, Marie-Alexandrine Sicre, Jian Ren, Vincent Klein, Haiyan Jin, and Jianfang Chen
Biogeosciences, 21, 689–709, https://doi.org/10.5194/bg-21-689-2024, https://doi.org/10.5194/bg-21-689-2024, 2024
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Algal biomarkers were used to assess sea ice and pelagic algal production across the western Arctic Ocean with changing sea-ice conditions. They show three distinct areas along with a marked latitudinal gradient of sea ice over pelagic algal production in surface sediments that are reflected by the H-Print index. Our data also show that efficient grazing consumption accounted for the dramatic decrease of diatom-derived biomarkers in sediments compared to that of particulate matter.
Hanxiao Wang, Zhifei Liu, Jiaying Li, Baozhi Lin, Yulong Zhao, Xiaodong Zhang, Junyuan Cao, Jingwen Zhang, Hongzhe Song, and Wenzhuo Wang
Biogeosciences, 20, 5109–5123, https://doi.org/10.5194/bg-20-5109-2023, https://doi.org/10.5194/bg-20-5109-2023, 2023
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The sinking of zooplankton fecal pellets is a key process in the marine biological carbon pump. This study presents carbon export of four shapes of fecal pellets from two time-series sediment traps in the South China Sea. The results show that the sinking fate of fecal pellets is regulated by marine primary productivity, deep-dwelling zooplankton community, and deep-sea currents in the tropical marginal sea, thus providing a new perspective for exploring the carbon cycle in the world ocean.
Colleen L. Hoffman, Patrick J. Monreal, Justine B. Albers, Alastair J. M. Lough, Alyson E. Santoro, Travis Mellett, Kristen N. Buck, Alessandro Tagliabue, Maeve C. Lohan, Joseph A. Resing, and Randelle M. Bundy
EGUsphere, https://doi.org/10.1101/2023.01.05.522639, https://doi.org/10.1101/2023.01.05.522639, 2023
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Hydrothermally-derived iron can be transported thousands of kilometers away from deep-sea vents, representing a significant flux of vital micronutrients to the ocean. However, the mechanisms that support the stabilization and transport of dissolved iron remain elusive. Using electrochemical methods, advanced mass spectrometry techniques, and genomic tools we demonstrate that strong microbially-produced ligands appear to exert an important control on plume iron biogeochemistry and dissemination.
Rebecca J. Chmiel, Riss M. Kell, Deepa Rao, Dawn M. Moran, Giacomo R. DiTullio, and Mak A. Saito
Biogeosciences, 20, 3997–4027, https://doi.org/10.5194/bg-20-3997-2023, https://doi.org/10.5194/bg-20-3997-2023, 2023
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Cobalt is an important micronutrient for plankton, yet it is often scarce throughout the oceans. A 2017/2018 expedition to coastal Antarctica, including regions of the Amundsen Sea and the Ross Sea, discovered lower concentrations of cobalt compared to two past expeditions in 2005 and 2006, particularly for the type of cobalt preferred as a nutrient by phytoplankton. This loss may be due to changing inputs of other nutrients, causing higher uptake of cobalt by plankton over the last decade.
Alessio Leins, Danaé Bregnard, Andrea Vieth-Hillebrand, Stefanie Poetz, Florian Eichinger, Guillaume Cailleau, Pilar Junier, and Simona Regenspurg
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-159, https://doi.org/10.5194/bg-2023-159, 2023
Revised manuscript accepted for BG
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Organic matter and microbial fluid analyses are rarely taken into account in the geothermal industry and research. However, they can have a significant effect on the efficiency of geothermal power production. We discovered a high variety in organic compound composition in our samples and were able to differentiate it with regard to various sources (e.g. artificial and biogenic). Furthermore, the microbial diversity undergoes significant changes within the flow path of a geothermal power plant.
Emily B. Graham, Hyun-Seob Song, Samantha Grieger, Vanessa A. Garayburu-Caruso, James C. Stegen, Kevin D. Bladon, and Allison N. Myers-Pigg
Biogeosciences, 20, 3449–3457, https://doi.org/10.5194/bg-20-3449-2023, https://doi.org/10.5194/bg-20-3449-2023, 2023
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Intensifying wildfires are increasing pyrogenic organic matter (PyOM) production and its impact on water quality. Recent work indicates that PyOM may have a greater impact on aquatic biogeochemistry than previously assumed, driven by higher bioavailability. We provide a full assessment of the potential bioavailability of PyOM across its chemical spectrum. We indicate that PyOM can be actively transformed within the river corridor and, therefore, may be a growing source of riverine C emissions.
Nora Richter, Ellen C. Hopmans, Danica Mitrović, Pedro M. Raposeiro, Vítor Gonçalves, Ana C. Costa, Linda A. Amaral-Zettler, Laura Villanueva, and Darci Rush
Biogeosciences, 20, 2065–2098, https://doi.org/10.5194/bg-20-2065-2023, https://doi.org/10.5194/bg-20-2065-2023, 2023
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Bacteriohopanepolyols (BHPs) are a diverse class of lipids produced by bacteria across a wide range of environments. This study characterizes the diversity of BHPs in lakes and coastal lagoons in the Azores Archipelago, as well as a co-culture enriched for methanotrophs. We highlight the potential of BHPs as taxonomic markers for bacteria associated with certain ecological niches, which can be preserved in sedimentary records.
Andrea Scheibe, Carlos A. Sierra, and Marie Spohn
Biogeosciences, 20, 827–838, https://doi.org/10.5194/bg-20-827-2023, https://doi.org/10.5194/bg-20-827-2023, 2023
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We explored carbon cycling in soils in three climate zones in Chile down to a depth of 6 m, using carbon isotopes. Our results show that microbial activity several meters below the soil surface is mostly fueled by recently fixed carbon and that strong decomposition of soil organic matter only occurs in the upper decimeters of the soils. The study shows that different layers of the critical zone are tightly connected and that processes in the deep soil depend on recently fixed carbon.
Melissa Sophia Schwab, Hannah Gies, Chantal Valérie Freymond, Maarten Lupker, Negar Haghipour, and Timothy Ian Eglinton
Biogeosciences, 19, 5591–5616, https://doi.org/10.5194/bg-19-5591-2022, https://doi.org/10.5194/bg-19-5591-2022, 2022
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The majority of river studies focus on headwater or floodplain systems, while often neglecting intermediate river segments. Our study on the subalpine Sihl River bridges the gap between streams and lowlands and demonstrates that moderately steep river segments are areas of significant instream alterations, modulating the export of organic carbon over short distances.
Lisa Noll, Shasha Zhang, Qing Zheng, Yuntao Hu, Florian Hofhansl, and Wolfgang Wanek
Biogeosciences, 19, 5419–5433, https://doi.org/10.5194/bg-19-5419-2022, https://doi.org/10.5194/bg-19-5419-2022, 2022
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Cleavage of proteins to smaller nitrogen compounds allows microorganisms and plants to exploit the largest nitrogen reservoir in soils and is considered the bottleneck in soil organic nitrogen cycling. Results from soils covering a European transect show that protein turnover is constrained by soil geochemistry, shifts in climate and associated alterations in soil weathering and should be considered as a driver of soil nitrogen availability with repercussions on carbon cycle processes.
Muhammed Fatih Sert, Helge Niemann, Eoghan P. Reeves, Mats A. Granskog, Kevin P. Hand, Timo Kekäläinen, Janne Jänis, Pamela E. Rossel, Bénédicte Ferré, Anna Silyakova, and Friederike Gründger
Biogeosciences, 19, 2101–2120, https://doi.org/10.5194/bg-19-2101-2022, https://doi.org/10.5194/bg-19-2101-2022, 2022
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We investigate organic matter composition in the Arctic Ocean water column. We collected seawater samples from sea ice to deep waters at six vertical profiles near an active hydrothermal vent and its plume. In comparison to seawater, we found that the organic matter in waters directly affected by the hydrothermal plume had different chemical composition. We suggest that hydrothermal processes may influence the organic matter distribution in the deep ocean.
Charlotte Haugk, Loeka L. Jongejans, Kai Mangelsdorf, Matthias Fuchs, Olga Ogneva, Juri Palmtag, Gesine Mollenhauer, Paul J. Mann, P. Paul Overduin, Guido Grosse, Tina Sanders, Robyn E. Tuerena, Lutz Schirrmeister, Sebastian Wetterich, Alexander Kizyakov, Cornelia Karger, and Jens Strauss
Biogeosciences, 19, 2079–2094, https://doi.org/10.5194/bg-19-2079-2022, https://doi.org/10.5194/bg-19-2079-2022, 2022
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Buried animal and plant remains (carbon) from the last ice age were freeze-locked in permafrost. At an extremely fast eroding permafrost cliff in the Lena Delta (Siberia), we found this formerly frozen carbon well preserved. Our results show that ongoing degradation releases substantial amounts of this carbon, making it available for future carbon emissions. This mobilisation at the studied cliff and also similarly eroding sites bear the potential to affect rivers and oceans negatively.
Aleksandar I. Goranov, Andrew S. Wozniak, Kyle W. Bostick, Andrew R. Zimmerman, Siddhartha Mitra, and Patrick G. Hatcher
Biogeosciences, 19, 1491–1514, https://doi.org/10.5194/bg-19-1491-2022, https://doi.org/10.5194/bg-19-1491-2022, 2022
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Wildfire-derived molecules are ubiquitous in the aquatic environment, but their biological fate remains understudied. We have evaluated the compositional changes that occur to wildfire-derived molecules after incubation with soil microbes. We observe a significant degradation but also a production of numerous new labile molecules. Our results indicate that wildfire-derived molecules can be broken down and the carbon and nitrogen therein can be incorporated into microbial food webs.
Edgart Flores, Sebastian I. Cantarero, Paula Ruiz-Fernández, Nadia Dildar, Matthias Zabel, Osvaldo Ulloa, and Julio Sepúlveda
Biogeosciences, 19, 1395–1420, https://doi.org/10.5194/bg-19-1395-2022, https://doi.org/10.5194/bg-19-1395-2022, 2022
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In this study, we investigate the chemical diversity and abundance of microbial lipids as markers of organic matter sources in the deepest points of the Atacama Trench sediments and compare them to similar lipid stocks in shallower surface sediments and in the overlying water column. We evaluate possible organic matter provenance and some potential chemical adaptations of the in situ microbial community to the extreme conditions of high hydrostatic pressure in hadal realm.
Zoë R. van Kemenade, Laura Villanueva, Ellen C. Hopmans, Peter Kraal, Harry J. Witte, Jaap S. Sinninghe Damsté, and Darci Rush
Biogeosciences, 19, 201–221, https://doi.org/10.5194/bg-19-201-2022, https://doi.org/10.5194/bg-19-201-2022, 2022
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Anaerobic ammonium oxidation (anammox) is an important nitrogen-removal process in the ocean. We assess the distribution of bacteriohopanetetrol-x (BHT-x), used to trace past anammox, along a redox gradient in the water column of the Benguela upwelling system. BHT-x / BHT ratios of >0.18 correspond to the presence of living anammox bacteria and oxygen levels <50 μmol L−1. This allows for a more robust application of BHT-x to trace past marine anammox and deoxygenation in dynamic marine systems.
Jia-Jang Hung, Ching-Han Tung, Zong-Ying Lin, Yuh-ling Lee Chen, Shao-Hung Peng, Yen-Huei Lin, and Li-Shan Tsai
Biogeosciences, 18, 5141–5162, https://doi.org/10.5194/bg-18-5141-2021, https://doi.org/10.5194/bg-18-5141-2021, 2021
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We report measured active and passive fluxes and their controlling mechanisms in the northern South China Sea (NSCS). The total fluxes were higher than most reports in open oceans, indicating the significance of NSCS in atmospheric CO2 uptake and in storing that CO2 in the ocean’s interior. Winter cooling and extreme events enhanced nutrient availability and elevated fluxes. Global warming may have profound impacts on reducing ocean’s uptake and storage of CO2 in subtropical–tropical oceans.
Jens Daniel Müller, Bernd Schneider, Ulf Gräwe, Peer Fietzek, Marcus Bo Wallin, Anna Rutgersson, Norbert Wasmund, Siegfried Krüger, and Gregor Rehder
Biogeosciences, 18, 4889–4917, https://doi.org/10.5194/bg-18-4889-2021, https://doi.org/10.5194/bg-18-4889-2021, 2021
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Based on profiling pCO2 measurements from a field campaign, we quantify the biomass production of a cyanobacteria bloom in the Baltic Sea, the export of which would foster deep water deoxygenation. We further demonstrate how this biomass production can be accurately reconstructed from long-term surface measurements made on cargo vessels in combination with modelled temperature profiles. This approach enables a better understanding of a severe concern for the Baltic’s good environmental status.
Alexander Braun, Marina Spona-Friedl, Maria Avramov, Martin Elsner, Federico Baltar, Thomas Reinthaler, Gerhard J. Herndl, and Christian Griebler
Biogeosciences, 18, 3689–3700, https://doi.org/10.5194/bg-18-3689-2021, https://doi.org/10.5194/bg-18-3689-2021, 2021
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It is known that CO2 fixation by photoautotrophic organisms is the major sink from the atmosphere. While biologists are aware that CO2 fixation also occurs in heterotrophic organisms, this route of inorganic carbon, and its quantitative role, is hardly recognized in biogeochemistry. We demonstrate that a considerable amount of CO2 is fixed annually through anaplerotic reactions in heterotrophic organisms, and a significant quantity of inorganic carbon is temporally sequestered in biomass.
Jonathan H. Raberg, David J. Harning, Sarah E. Crump, Greg de Wet, Aria Blumm, Sebastian Kopf, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
Biogeosciences, 18, 3579–3603, https://doi.org/10.5194/bg-18-3579-2021, https://doi.org/10.5194/bg-18-3579-2021, 2021
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BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can influence them, and seasonality can affect the temperatures they record. We find a warm-season bias at 43 new high-latitude sites. We also present a new method that deconvolves the effects of temperature, pH, and conductivity and generate global calibrations for these variables. Our study provides new paleoclimate tools, insight into brGDGTs at the biochemical level, and a new method for future study.
Charlotte L. Spencer-Jones, Erin L. McClymont, Nicole J. Bale, Ellen C. Hopmans, Stefan Schouten, Juliane Müller, E. Povl Abrahamsen, Claire Allen, Torsten Bickert, Claus-Dieter Hillenbrand, Elaine Mawbey, Victoria Peck, Aleksandra Svalova, and James A. Smith
Biogeosciences, 18, 3485–3504, https://doi.org/10.5194/bg-18-3485-2021, https://doi.org/10.5194/bg-18-3485-2021, 2021
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Long-term ocean temperature records are needed to fully understand the impact of West Antarctic Ice Sheet collapse. Glycerol dialkyl glycerol tetraethers (GDGTs) are powerful tools for reconstructing ocean temperature but can be difficult to apply to the Southern Ocean. Our results show active GDGT synthesis in relatively warm depths of the ocean. This research improves the application of GDGT palaeoceanographic proxies in the Southern Ocean.
Alec W. Armstrong, Leanne Powers, and Michael Gonsior
Biogeosciences, 18, 3367–3390, https://doi.org/10.5194/bg-18-3367-2021, https://doi.org/10.5194/bg-18-3367-2021, 2021
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Living things decay into organic matter, which can dissolve into water (like tea brewing). Tea receives its color by absorbing light. Similarly, this material absorbs light, which can then cause chemical reactions that change it. By measuring changes in these optical properties, we found that materials from some places are more sensitive to light than others. Comparing sensitivity to light helps us understand where these materials come from and what happens as they move through water.
Ben J. Fisher, Johan C. Faust, Oliver W. Moore, Caroline L. Peacock, and Christian März
Biogeosciences, 18, 3409–3419, https://doi.org/10.5194/bg-18-3409-2021, https://doi.org/10.5194/bg-18-3409-2021, 2021
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Organic carbon can be protected from microbial degradation in marine sediments through association with iron minerals on 1000-year timescales. Despite the importance of this carbon sink, our spatial and temporal understanding of iron-bound organic carbon interactions globally is poor. Here we show that caution must be applied when comparing quantification of iron-bound organic carbon extracted by different methods as the extraction strength and method specificity can be highly variable.
Mark A. Stevenson, Suzanne McGowan, Emma J. Pearson, George E. A. Swann, Melanie J. Leng, Vivienne J. Jones, Joseph J. Bailey, Xianyu Huang, and Erika Whiteford
Biogeosciences, 18, 2465–2485, https://doi.org/10.5194/bg-18-2465-2021, https://doi.org/10.5194/bg-18-2465-2021, 2021
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We link detailed stable isotope and biomarker analyses from the catchments of three Arctic upland lakes on Disko Island (West Greenland) to a recent dated sediment core to understand how carbon cycling has changed over the past ~500 years. We find that the carbon deposited in sediments in these upland lakes is predominately sourced from in-lake production due to the catchment's limited terrestrial vegetation and elevation and that recent increases in algal production link with climate change.
Nadine T. Smit, Laura Villanueva, Darci Rush, Fausto Grassa, Caitlyn R. Witkowski, Mira Holzheimer, Adriaan J. Minnaard, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 18, 1463–1479, https://doi.org/10.5194/bg-18-1463-2021, https://doi.org/10.5194/bg-18-1463-2021, 2021
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Soils from an everlasting fire (gas seep) in Sicily, Italy, reveal high relative abundances of novel uncultivated mycobacteria and unique 13C-depleted mycocerosic acids (multi-methyl branched fatty acids) close to the main gas seep. Our results imply that mycocerosic acids in combination with their depleted δ13C values offer a new biomarker tool to study the role of soil mycobacteria as hydrocarbon consumers in the modern and past global carbon cycle.
Marcus P. S. Badger
Biogeosciences, 18, 1149–1160, https://doi.org/10.5194/bg-18-1149-2021, https://doi.org/10.5194/bg-18-1149-2021, 2021
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Reconstructing ancient atmospheric CO2 is an important aim of palaeoclimate science in order to understand the Earth's climate system. One method, the alkenone proxy based on molecular fossils of coccolithophores, has been recently shown to be ineffective at low-to-moderate CO2 levels. In this paper I show that this is likely due to changes in the biogeochemistry of the coccolithophores when there is low carbon availability, but for much of the Cenozoic the alkenone proxy should have utility.
Loes G. J. van Bree, Francien Peterse, Allix J. Baxter, Wannes De Crop, Sigrid van Grinsven, Laura Villanueva, Dirk Verschuren, and Jaap S. Sinninghe Damsté
Biogeosciences, 17, 5443–5463, https://doi.org/10.5194/bg-17-5443-2020, https://doi.org/10.5194/bg-17-5443-2020, 2020
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Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are used as a paleothermometer based on their temperature dependence in global soils, but aquatic production complicates their use in lakes. BrGDGTs in the water column of Lake Chala, East Africa, respond to oxygen conditions and mixing. Changes in their signal can be linked to bacterial community composition rather than membrane adaptation to changing conditions. Their integrated signal in the sediment reflects mean air temperature.
Alexandra N. Loginova, Andrew W. Dale, Frédéric A. C. Le Moigne, Sören Thomsen, Stefan Sommer, David Clemens, Klaus Wallmann, and Anja Engel
Biogeosciences, 17, 4663–4679, https://doi.org/10.5194/bg-17-4663-2020, https://doi.org/10.5194/bg-17-4663-2020, 2020
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We measured dissolved organic carbon (DOC), nitrogen (DON) and matter (DOM) optical properties in pore waters and near-bottom waters of the eastern tropical South Pacific off Peru. The difference between diffusion-driven and net fluxes of DOC and DON and qualitative changes in DOM optical properties suggested active microbial utilisation of the released DOM at the sediment–water interface. Our results suggest that the sediment release of DOM contributes to microbial processes in the area.
Gerard J. M. Versteegh, Alexander J. P. Houben, and Karin A. F. Zonneveld
Biogeosciences, 17, 3545–3561, https://doi.org/10.5194/bg-17-3545-2020, https://doi.org/10.5194/bg-17-3545-2020, 2020
Short summary
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Anoxic sediments mostly contain much more organic matter than oxic ones, and therefore organic matter in anoxic settings is often considered to be preserved better than in oxic settings. However, through the analysis of the same fossil dinoflagellate cyst species from both oxic and anoxic settings, we show that at a molecular level the preservation in the oxic sediments may be better since in the anoxic setting the cyst macromolecule has been altered by postdepositional modification.
Jingjing Guo, Miriam Glendell, Jeroen Meersmans, Frédérique Kirkels, Jack J. Middelburg, and Francien Peterse
Biogeosciences, 17, 3183–3201, https://doi.org/10.5194/bg-17-3183-2020, https://doi.org/10.5194/bg-17-3183-2020, 2020
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The fluxes of soil organic carbon (OC) transport from land to sea are poorly constrained, mostly due to the lack of a specific tracer for soil OC. Here we evaluate the use of specific molecules derived from soil bacteria as a tracer for soil OC in a small river catchment. We find that the initial soil signal is lost upon entering the aquatic environment. However, the local environmental history of the catchment is reflected by these molecules in the lake sediments that act as their sink.
Zhuo-Yi Zhu, Joanne Oakes, Bradley Eyre, Youyou Hao, Edwin Sien Aun Sia, Shan Jiang, Moritz Müller, and Jing Zhang
Biogeosciences, 17, 2473–2485, https://doi.org/10.5194/bg-17-2473-2020, https://doi.org/10.5194/bg-17-2473-2020, 2020
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Samples were collected in August 2016 in the Rajang River and its estuary, with tropical forest in the river basin and peatland in the estuary. Organic matter composition was influenced by transportation in the river basin, whereas peatland added clear biodegraded parts to the fluvial organic matter, which implies modification of the initial lability and/or starting points in the subsequent degradation and alternation processes after the organic matter enters the sea.
Wenjie Xiao, Yasong Wang, Yongsheng Liu, Xi Zhang, Linlin Shi, and Yunping Xu
Biogeosciences, 17, 2135–2148, https://doi.org/10.5194/bg-17-2135-2020, https://doi.org/10.5194/bg-17-2135-2020, 2020
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The hadal zone (6–11 km depth) is the least explored habitat on Earth. We studied microbial branched glycerol dialkyl glycerol tetraethers (brGDGTs) in the Challenger Deep, Mariana Trench. One unique feature is the strong predominance of 6-methyl brGDGT, which likely reflects an adaption of brGDGT-producing bacteria to alkaline seawater and low temperature. BrGDGTs, with elemental and isotopic data, suggest an autochthonous product for brGDGT. A new approach is proposed for brGDGT sourcing.
Yuge Bai, Edisson Subdiaga, Stefan B. Haderlein, Heike Knicker, and Andreas Kappler
Biogeosciences, 17, 683–698, https://doi.org/10.5194/bg-17-683-2020, https://doi.org/10.5194/bg-17-683-2020, 2020
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Biogeochemical processes of SOM are key for greenhouse gas emission and water quality. We extracted SOM by water or by NaOH–HCl under oxic–anoxic conditions. Chemical and anoxic extractions lead to higher SOM electron exchange capacities, resulting in stimulation of microbial Fe(III) reduction. Therefore, aqueous pH-neutral SOM extracts should be used to reflect environmental SOM redox processes, and artifacts of chemical extractions need to be considered when evaluating SOM redox processes.
Yan Shen, Volker Thiel, Pablo Suarez-Gonzalez, Sebastiaan W. Rampen, and Joachim Reitner
Biogeosciences, 17, 649–666, https://doi.org/10.5194/bg-17-649-2020, https://doi.org/10.5194/bg-17-649-2020, 2020
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Today, sterols are widespread in plants, animals, and fungi but are almost absent in the oldest rocks. Microbial mats, representing the earliest complex ecosystems on Earth, were omnipresent in Precambrian marine environments and may have degraded the sterols at that time. Here we analyze the distribution of sterols through a microbial mat. This provides insight into how variations in biological and nonbiological factors affect the preservation of sterols in modern and ancient microbial mats.
Sarah Coffinet, Travis B. Meador, Lukas Mühlena, Kevin W. Becker, Jan Schröder, Qing-Zeng Zhu, Julius S. Lipp, Verena B. Heuer, Matthew P. Crump, and Kai-Uwe Hinrichs
Biogeosciences, 17, 317–330, https://doi.org/10.5194/bg-17-317-2020, https://doi.org/10.5194/bg-17-317-2020, 2020
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This study deals with two membrane lipids called BDGTs and PDGTs. Membrane lipids are molecules forming the cell envelope of all organisms. Different organisms produce different lipids thus they can be used to detect the presence of specific organisms in the environment. We analyzed the structure of these new lipids and looked for potential producers. We found that they are likely made by microbes emitting methane below the sediment surface and could be used to track these specific microbes.
Ying Wu, Kun Zhu, Jing Zhang, Moritz Müller, Shan Jiang, Aazani Mujahid, Mohd Fakharuddin Muhamad, and Edwin Sien Aun Sia
Biogeosciences, 16, 4517–4533, https://doi.org/10.5194/bg-16-4517-2019, https://doi.org/10.5194/bg-16-4517-2019, 2019
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Our understanding of terrestrial organic matter (TOM) in tropical peat-draining rivers remains limited, especially in Southeast Asia. We explored the characteristics of TOM via bulk parameters and lignin phenols of sediment in Malaysia. This showed that the most important plant source of the organic matter in these rivers is woody angiosperm C3 plants with limited diagenetic alteration. This slower degradation of TOM may be a link to higher total nitrogen content, especially for the small river.
Caitlyn R. Witkowski, Sylvain Agostini, Ben P. Harvey, Marcel T. J. van der Meer, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 16, 4451–4461, https://doi.org/10.5194/bg-16-4451-2019, https://doi.org/10.5194/bg-16-4451-2019, 2019
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Carbon dioxide concentrations (pCO2) in the atmosphere play an integral role in Earth system dynamics, especially climate. Past climates help us understand future ones, but reconstructing pCO2 over the geologic record remains a challenge. This research demonstrates new approaches for exploring past pCO2 via the carbon isotope fractionation in general algal lipids, which we test over a high CO2 gradient from a naturally occurring CO2 seep.
Yongli Zhou, Patrick Martin, and Moritz Müller
Biogeosciences, 16, 2733–2749, https://doi.org/10.5194/bg-16-2733-2019, https://doi.org/10.5194/bg-16-2733-2019, 2019
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We found that peatlands in coastal Sarawak, Borneo, export extremely humified organic matter, which dominates the riverine organic matter pool and conservatively mixes with seawater, while the freshly produced fraction is low and stable in concentration at all salinities. We estimated that terrigenous fractions, which showed high photolability, still account for 20 % of the coastal dissolved organic carbon pool, implying the importance of peat-derived organic matter in the coastal carbon cycle.
Kristin Doering, Claudia Ehlert, Philippe Martinez, Martin Frank, and Ralph Schneider
Biogeosciences, 16, 2163–2180, https://doi.org/10.5194/bg-16-2163-2019, https://doi.org/10.5194/bg-16-2163-2019, 2019
Alexandra N. Loginova, Sören Thomsen, Marcus Dengler, Jan Lüdke, and Anja Engel
Biogeosciences, 16, 2033–2047, https://doi.org/10.5194/bg-16-2033-2019, https://doi.org/10.5194/bg-16-2033-2019, 2019
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High primary production in the Peruvian upwelling system is followed by rapid heterotrophic utilization of organic matter and supports the formation of one of the most intense oxygen minimum zones (OMZs) in the world. Here, we estimated vertical fluxes of oxygen and dissolved organic matter (DOM) from the surface to the OMZ. Our results suggest that DOM remineralization substantially reduces oxygen concentration in the upper water column and controls the shape of the upper oxycline.
Carolina Cisternas-Novoa, Frédéric A. C. Le Moigne, and Anja Engel
Biogeosciences, 16, 927–947, https://doi.org/10.5194/bg-16-927-2019, https://doi.org/10.5194/bg-16-927-2019, 2019
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We investigate the composition and vertical fluxes of POM in two deep basins of the Baltic Sea (GB: Gotland Basin and LD: Landsort Deep). The two basins showed different O2 regimes resulting from the intrusion of oxygen-rich water from the North Sea that ventilated the deep waters in GB, but not in LD.
In GB, O2 intrusions lead to a high abundance of manganese oxides that aggregate with POM, altering its composition and vertical flux and contributing to a higher POC transfer efficiency in GB.
Marina Zamanillo, Eva Ortega-Retuerta, Sdena Nunes, Pablo Rodríguez-Ros, Manuel Dall'Osto, Marta Estrada, Maria Montserrat Sala, and Rafel Simó
Biogeosciences, 16, 733–749, https://doi.org/10.5194/bg-16-733-2019, https://doi.org/10.5194/bg-16-733-2019, 2019
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Many marine microorganisms produce polysaccharide-rich transparent exopolymer particles (TEPs) for rather unknown reasons but with important consequences for the ocean carbon cycle, sea–air gas exchange and formation of organic aerosols. Here we compare surface–ocean distributions of TEPs and physical, chemical and biological variables along a N–S transect in the Atlantic Ocean. Our data suggest that phytoplankton and not bacteria are the main TEP producers, and solar radiation acts as a sink.
Michael Philben, Sara Butler, Sharon A. Billings, Ronald Benner, Kate A. Edwards, and Susan E. Ziegler
Biogeosciences, 15, 6731–6746, https://doi.org/10.5194/bg-15-6731-2018, https://doi.org/10.5194/bg-15-6731-2018, 2018
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We explored the relationship between chemical composition and the temperature sensitivity of moss decomposition using 959-day lab incubations. Mass loss was low despite the predominance of carbohydrates, indicating the persistence of labile C. Scanning electron microscopy revealed little change in the moss cell-wall structure. These results suggest that the moss cell-wall matrix protects labile C from decomposition, contributing to the globally important stocks of moss-derived C.
Cited articles
Abramson, L., Lee, C., Liu, Z., Wakeham, S. G., and Szlosek, J.: Exchange
between suspended and sinking particles in the northwest Mediterranean as
inferred from the organic composition of in situ pump and sediment trap
samples, Limnol. Oceanogr., 55, 725–739, 2011.
Alldredge, A.: The carbon, nitrogen and mass content of marine snow as a
function of aggregate size, Deep-Sea Res. Pt. I, 45, 529–541, 1998.
Alldredge, A. L. and Silver, M. W.: Charateristics, dynamics and
significance of marine snow, Prog. Oceanogr., 20, 41–82, 1988.
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, edited by: Volkman, J. K., Springer, Berlin,
Heidelberg, 251–293, https://doi.org/10.1007/698_2_008,
2006.
Altabet, M. A., Deuser, W. G., Honjo, S., and Stienen, C.: Seasonal and
depth-related changes in the source of sinking particles in the North
Atlantic, Nature, 354, 136–139, 1991.
Aluwihare, L. I., Repeta, D. J., Pantoja, S., and Johnson, C. G.: Two
chemically distinct pools of organic nitrogen accumulate in the ocean,
Science, 308, 1007–1010, 2005.
Aristegui, J., Gasol, J. M., Duarte, C. M., and Herndl, G. J.: Microbial
oceanography of the dark ocean's pelagic realm, Limnol. Oceanogr.,
54, 1501–1529, https://doi.org/10.4319/lo.2009.54.5.1501, 2009.
Armstrong, R. A., Lee, C., Hedges, J. I., Honjo, S., and Wakeham, S. G.: A
new, mechanistic model for organic carbon fluxes in the ocean based on the
quantitative association of POC with ballast minerals, Deep-Sea Res.
Pt. II, 49, 219–236, 2002.
Arnarson, T. S. and Keil, R. G.: Influence of organic-mineral aggregates on
microbial degradation of the dinoflagellate Scrippsiella trochoidea,
Geochim. Cosmochim. Ac., 69, 2111–2117, https://doi.org/10.1016/j.gca.2004.11.004,
2005.
Arnarson, T. S. and Keil, R. G.: Changes in organic matter-mineral
interactions for marine sediments with varying oxygen exposure times,
Geochim. Cosmochim. Ac., 71, 3545–3556, https://doi.org/10.1016/j.gca.2007.04.027,
2007.
Arrieta, J. M., Mayol, E., Hansman, R. L., Herndl, G. J., Dittmar, T., and
Duarte, C. M.: Dilution limits dissolved organic carbon utilization in the
deep ocean, Science, 348, 331–333, https://doi.org/10.1126/science.1258955, 2015.
Benner, R. and Kaiser, J.: Abundance of amino sugars and peptidoglycan in
marine particulate and dissolved organic matter, Limnol. Oceanogr.,
48, 118–128, 2003.
Benner, R., Louchouarn, P., and Amon, R. M. W.: Terrigenous dissolved
organic matter in the Arctic Ocean and its transport to surface and deep
waters of the North Atlantic, Global Biogeochem. Cy., 19, GB2025,
https://doi.org/10.1029/2004GB002398, 2005.
Boetius, A. and Lochte, K.: Regulation of microbial enzymatic degradation of
organic matter in deep-sea sediments, Mar. Ecol.-Prog. Ser., 104, 299–307,
https://doi.org/10.3354/meps104299, 1994.
Boetius, A., Ferdelman, T., and Lochte, K.: Bacterial activity in sediments
of the deep Arabian Sea in relation to vertical flux, Deep-Sea Res. Pt.
II, 47, 2835–2875, https://doi.org/10.1016/s0967-0645(00)00051-5,
2000a.
Boetius, A., Springer, B., and Petry, C.: Microbial activity and particulate
matter in the benthic nepheloid layer (BNL) of the deep Arabian Sea,
Deep-Sea Res. Pt. II, 47, 2687–2706,
https://doi.org/10.1016/s0967-0645(00)00045-x, 2000b.
Boyd, P., Claustre, H., Levy, M., Siegel, D., and Weber, T.: Multi-faceted
particle pumps drive carbon sequestration in the ocean, Nature, 568,
327–335, https://doi.org/10.1038/s41586-019-1098-2, 2019.
Boyd, S. R.: Nitrogen in future biosphere studies, Chem. Geol., 176,
1–30, https://doi.org/10.1016/S0009-2541(00)00405-8, 2001.
Brockmeyer, B. and Spitzy, A.: Evaluation of a Disc Tube Methodology for
Nano- and Ultrafiltration of Natural Dissolved Organic Matter, Int.
J. Org. Chem., 3, 17–25, 2013.
Bronk, D. A.: Chapter 5 – Dynamics of DON, in: Biogeochemistry of Marine Dissolved Organic Matter, edited by: Hansell, D. A., and Carlson, C. A., Academic Press, San Diego, 153–247, https://doi.org/10.1016/B978-012323841-2/50007-5, 2002.
Carlson, C. A. and Hansell, D. A.: Chapter 3 – DOM Sources, Sinks, Reactivity, and Budgets, in: Biogeochemistry of Marine Dissolved Organic Matter, 2nd Edn., edited by: Hansell, D. A. and Carlson, C. A., Academic Press, Boston, 65–126, https://doi.org/10.1016/B978-0-12-405940-5.00003-0, 2015.
Carr, S. A., Mills, C. T., and Mandernack, K. W.: The use of amino acid
indices for assessing organic matter quality and microbial abundance in
deep-sea Antarctic sediments of IODP Expedition 318, Mar. Chem., 186,
72–82, https://doi.org/10.1016/j.marchem.2016.08.002, 2016.
Cho, B. C. and Azam, F.: Major role of bacteria in biogeochemical fluxes in
the ocean's interior, Nature, 332, 441–443, 1988.
Ciais, P., Sabine, C., Bala, G., Bopp, L., Brovkin, V., Canadell, J.,
Chhabra, A., DeFries, R., Galloway, J., Heimann, M., Jones, C., Le Quere,
C., Myneni, R. B., Piao, S. L., Thornton, P., Ahlstrom, A., Anav, A.,
Andrews, O., Archer, D., Arora, V., Bonan, G., Borges, A. V., Bousquet, P.,
Bouwman, L., Bruhwiler, L. M., Caldeira, K., Cao, L., Chappellaz, J.,
Chevallier, F., Cleveland, C., Cox, P., Dentener, F. J., Doney, S. C.,
Erisman, J. W., Euskirchen, E. S., Friedlingstein, P., Gruber, N., Gurney,
K., Holland, E. A., Hopwood, B., Houghton, R. A., House, J. I., Houweling,
S., Hunter, S., Hurtt, G., Jacobson, A. D., Jain, A., Joos, F., Jungclaus,
J., Kaplan, J. O., Kato, E., Keeling, R., Khatiwala, S., Kirschke, S.,
Goldewijk, K. K., Kloster, S., Koven, C., Kroeze, C., Lamarque, J. F.,
Lassey, K., Law, R. M., Lenton, A., Lomas, M. R., Luo, Y. Q., Maki, T.,
Marland, G., Matthews, H. D., Mayorga, E., Melton, J. R., Metzl, N.,
Munhoven, G., Niwa, Y., Norby, R. J., O'Connor, F., Orr, J., Park, G. H.,
Patra, P., Peregon, A., Peters, W., Peylin, P., Piper, S., Pongratz, J.,
Poulter, B., Raymond, P. A., Rayner, P., Ridgwell, A., Ringeval, B.,
Rodenbeck, C., Saunois, M., Schmittner, A., Schuur, E., Sitch, S., Spahni,
R., Stocker, B., Takahashi, T., Thompson, R. L., Tjiputra, J., van der Werf,
G., van Vuuren, D., Voulgarakis, A., Wania, R., Zaehle, S., and Zeng, N.:
Carbon and Other Biogeochemical Cycles, Climate Change 2013: The Physical
Science Basis, Cambridge Univ. Press, Cambridge, 465–570, ISBN 978-1-107-66182, 978-1-107-05799-9, 2014.
Cohen, J.: Statistical power analysis for the behavorial sciences, 2nd Edn.,
L. Erlbaum Associates, edited by: Hillsdale, N. J., 567 pp., ISBN 978-0805802832, 1988.
Costello, M. J., Cheung, A., and De Hauwere, N.: Surface Area and the Seabed
Area, Volume, Depth, Slope, and Topographic Variation for the World's Seas,
Oceans, and Countries, Environ. Sci. Technol., 44, 8821–8828,
https://doi.org/10.1021/es1012752, 2010.
Cowie, G. L. and Hedges, J. I.: Sources and reactivities of amino acids in a
coastal marine environment, Limnol. Oceanogr., 37, 703–724, 1992.
Cowie, G. L. and Hedges, J. I.: Biogeochemical indicators of diagenetic
alteration in natural organic-matter mixtures, Nature, 369, 304–307, 1994.
Cowie, G. L., Hedges, J. I., Prahl, F. G., and De Lange, G. J.: Elemental
and major biochemical changes across an oxidation front in a relict
turbidite: An oxygen effect, Geochim. Cosmochim. Ac., 59, 33–46,
1995.
Dauwe, B. and Middelburg, J. J.: Amino acids and hexosamines as indicators
of organic matter degradation state in North Sea sediments, Limnol.
Oceanogr., 43, 782–798, 1998.
Dauwe, B., Middelburg, J. J., Hermann, P. M. J., and Heip, C. H. R.: Linking
diagenetic alteration of amino acids and bulk organic matter reactivity,
Limnol. Oceanogr., 44, 1809–1814, 1999.
Davis, J. and Benner, R.: Seasonal trends in the abundance, composition and
bioavailability of particulate and dissolved organic matter in the
Chukchi/Beaufort Seas and western Canada Basin, Deep-Sea Res. Pt. II, 52, 3396–3410, https://doi.org/10.1016/j.dsr2.2005.09.006, 2005.
Davis, J., Kaiser, K., and Benner, R.: Amino acid and amino sugar yields and
compositions as indicators of dissolved organic matter diagenesis, Org.
Geochem., 40, 343–352, https://doi.org/10.1016/j.orggeochem.2008.12.003, 2009.
Degens, E. T. and Ittekkot, V.: Dissolved organic carbon – An overview,
Mitt. Geol.-Paläont. Inst. Univ. Hamburg, Heft 55, 21–38, 1983.
Degens, E. T. and Ittekkot, V.: A new look at clay-organic interactions, in:
Ein Nord-Süd Profil: Zentraleuropa-Mittelmmeerraum-Afrika, edited by:
Degens, E. T., Krumbein, W. E., and Prashnowsky, A. A., Mitteilungen aus dem
Geologisch-Paläontologischen Institut der Universität Hamburg,
Krause-Druck, Stade, 229–248, 1984.
Degens, E. T. and Ittekkot, V.: Particulate organic carbon – An overview,
Mitt. Geol.-Paläont. Inst. Univ. Hamburg, SCOPE/UNEP Sonderband,
Heft 58, 7–27, 1985.
Degens, E. T. and Mopper, K.: Early diagenesis of organic matter in marine
soils, Soil Sci., 119, 65–72, https://doi.org/10.1097/00010694-197501000-00010, 1975.
Druffel, E. R. M. and Williams, P. M.: Identification of a deep marine
source of particulate organic carbon using bomb 14C, Nature, 347,
172–174, https://doi.org/10.1038/347172a0, 1990.
Emeis, K.-C., Mara, P., Schlarbaum, T., Möbius, J., Dähnke, K.,
Struck, U., Mihalopoulos, N., and Krom, M.: External inputs and internal N
cycling traced by isotope ratios of nitrate, dissolved reduced nitrogen, and
particulate nitrogen in the eastern Mediterranean Sea, J.
Geophys. Res., 115, G04041, https://doi.org/10.1029/2009JG001214, 2010.
England, M. E.: The Age of Water and Ventilation Timescales in a Global
Ocean Model, J. Phys. Oceanogr., 25, 2756–2777,
https://doi.org/10.1175/1520-0485(1995)025<2756:taowav>2.0.co;2, 1995.
Fowler, S. W. and Knauer, G. A.: Role of large particles in the transport of
elements and organic compounds through the oceanic water column, Prog.
Oceanogr., 16, 147–194, https://doi.org/10.1016/0079-6611(86)90032-7, 1986.
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, https://doi.org/10.1038/ngeo1832, 2013.
Gaye-Haake, B., Unger, D., Nöthig, E.-M., Okolodkov, Y., Fahl, K., and
Ittekkot, V.: Particle fluxes from short term sediment trap deployments in
late summer in the southern Kara Sea, in: Siberian River Run-off in
the Kara Sea: Characterisation, Quantification, Variability, and
Environmental Significance, edited by: Stein, R., Fahl, K.,
Fütterer, D. K., Galimov, E., and Stepanets, O., Proceedings in Marine Science, Elsevier,
Amsterdam, 309–328, 2003.
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., Fahl, K., Kodina, L. A., Lahajnar, N., Nagel, B., Unger, D., and
Gebhardt, A. C.: Particulate matter fluxes in the southern and central Kara
Sea compared to sediments: Bulk fluxes, amino acids, stable carbon and
nitrogen isotopes, sterols and fatty acids, Cont. Shelf Res., 27, 2570–2594,
https://doi.org/10.1016/j.csr.2007.07.003, 2007.
Gaye, B., Wiesner, M. G., and Lahajnar, N.: Nitrogen sources in the South
China Sea, as discerned from stable nitrogen isotopic ratios in rivers,
sinking particles, and sediments, Mar. Chem., 114, 72–85, 2009.
Gaye, B., Nagel, B., Daehnke, 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.
Gaye, B., Boell, A., Segschneider, J., Burdanowitz, N., Emeis, K.-C.,
Ramaswamy, V., Lahajnar, N., Lueckge, A., and Rixen, T.:
Glacial-interglacial changes and Holocene variations in Arabian Sea
denitrification, Biogeosciences, 15, 507–527, https://doi.org/10.5194/bg-15-507-2018, 2018.
Gaye, B., Lahajnar, N., Harms, N., Paul, S. A. L., Rixen, T., and Emeis, K.-C.: Amino acids and hexosamines in suspended matter samples collected in different oceanic areas between 1999 and 2017 from shelf seas to the deep ocean, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.940723, 2022a.
Gaye, B., Lahajnar, N., Harms, N., Paul, S. A. L., Rixen, T., and Emeis, K.-C.: Amino acids and hexosamines of sediment samples from different oceanic areas between 1987 and 2015 from shelf seas to the deep ocean, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.940791, 2022b.
Gebbie, G. and Huybers, P.: The Mean Age of Ocean Waters Inferred from
Radiocarbon Observations: Sensitivity to Surface Sources and Accounting for
Mixing Histories, J. Phys. Oceanogr., 42, 291–305, https://doi.org/10.1175/jpo-d-11-043.1,
2012.
Gloeckler, K., Choy, C. A., Hannides, C. C. S., Close, H. G., Goetze, E.,
Popp, B. N., and Drazen, J. C.: Stable isotope analysis of micronekton
around Hawaii reveals suspended particles are an important nutritional
source in the lower mesopelagic and upper bathypelagic zones, Limnol.
Oceanogr., 63, 1168–1180, https://doi.org/10.1002/lno.10762, 2018.
Goutx, M., Wakeham, S. G., Lee, C., Duflos, M., Guigue, C., Liu, Z.,
Moriceau, B., Sempére, R., Tedetti, M., and Xue, J.: Composition and
degradation of marine particles with different settling velocities in the
northwestern Mediterranean Sea, Limnol. Oceanogr., 52, 1645–1664,
2007.
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, 51, ISBN 9780123725226,
2008.
Guo, J., Liang, S.-K., Li, X.-J., Li, W., Wang, Y., and Su, R.-G.:
Composition and bioavailability of dissolved organic matter in different
water masses of the East China Sea, Estuar. Coas. Shelf Sci.,
212, 189–202, https://doi.org/10.1016/j.ecss.2018.07.009, 2018.
Haake, B., Rixen, T., and Ittekkot, V.: Variability of monsoonal upwelling
signals in the deep western Arabian Sea, Mitt. Geol.-Paläont. Inst.
Univ. Hamburg, Scope/UNEP Sonderband, Heft 76, 85–96, 1993a.
Haake, B., Ittekkot, V., Honjo, S., and Manganini, S.: Amino acids,
hexosamines and carbohydrate fluxes to the deep Subarctic Pacific (Station
P), Deep-Sea Res. Pt. I, 40, 547–560, 1993b.
Haake, B., Ittekkot, V., Ramaswamy, V., Nair, R. R., and Honjo, S.: Fluxes
of amino acids and hexosamines of the deep Arabian Sea, Mar. Chem.,
40, 291–314, 1992.
Haake, B., Rixen, T., Reemtsma, T., Ramaswamy, V., and Ittekkot, V.:
Processes determining seasonality and interannual variability of settling
particle fluxes to the deep Arabian Sea, in: Particle Flux in the Ocean,
edited by: Ittekkot, V., Schäfer, P., Honjo, S., and Depetris, P. J.,
John Wiley&Sons Ltd., 251–270, ISBN 0-471-96073-X, 1996.
Haeckel, M.: Particulate geochemistry of sediment core SO242/1_108-1_MUC 26, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.884975, 2018a.
Haeckel, M.: Particulate geochemistry of sediment core SO242/1_38-1_GC 1, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.884981, 2018b.
Haeckel, M.: Particulate geochemistry of sediment push core SO242/2_166_PUC-70, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.885023, 2018c.
Hannides, C. C. S., Popp, B. N., Choy, C. A., and Drazen, J. C.: Midwater
zooplankton and suspended particle dynamics in the North Pacific Subtropical
Gyre: A stable isotope perspective, Limnol. Oceanogr., 58,
1931–1946, https://doi.org/10.4319/lo.2013.58.6.1931, 2013.
Hansell, D. A. and Carlson, C. A.: Localized refractory dissolved organic
carbon sinks in the deep ocean, Global Biogeochem. Cy., 27, 705–710,
2013.
Hansell, D., Carlson, C. A., Repeta, D. J., and Schlitzer, R.: Dissolved
organic matter in the ocean, Oceanography, 22, 202–211, 2009.
Harms, N. C., Lahajnar, N., Gaye, B., Rixen, T., Dähnke, K., Ankele, M.,
Schwarz-Schampera, U., and Emeis, K. C.: Nutrient distribution and nitrogen
and oxygen isotopic composition of nitrate in water masses of the
subtropical southern Indian Ocean, Biogeosciences, 16, 2715–2732,
https://doi.org/10.5194/bg-16-2715-2019, 2019.
Harms, N. C., Lahajnar, N., Gaye, B., Rixen, T., Schwarz-Schampera, U., and
Emeis, K.-C.: Sediment trap-derived particulate matter fluxes in the
oligotrophic subtropical gyre of the South Indian Ocean, Deep-Sea Res.
Pt. II, 183, 104924, https://doi.org/10.1016/j.dsr2.2020.104924, 2021.
Hedges, J. I. and Hare, P. E.: Amino acid adsorption by clay minerals in
distilled water, Geochim. Cosmochim. Ac., 51, 255–259, 1987.
Hedges, J. I. and Keil, R. G.: Sedimentary organic matter preservation an
assessment and speculative synthesis, Mar. Chem., 49, 137–139,
https://doi.org/10.1016/0304-4203(95)00013-h, 1995.
Hildebrandt, Tatjana M., Nunes Nesi, A., Araújo, Wagner L., and Braun,
H.-P.: Amino Acid Catabolism in Plants, Mol. Plant, 8, 1563–1579,
https://doi.org/10.1016/j.molp.2015.09.005, 2015.
Honjo, S., Manganini, S. J., Krishfield, R. A., and Francois, R.:
Particulate organic carbon fluxes to the ocean interior and factors
controlling the biological pump: A synthesis of global sediment trap
programs since 1983, Prog. Oceanogr., 76, 217–285,
https://doi.org/10.1016/j.pocean.2007.11.003, 2008.
Ingalls, A. E., Aller, R. C., Lee, C., and Wakeham, S. G.: Organic matter
diagenesis in shallow water carbonate sediments, Geochim. Cosmochim.
Ac., 68, 4263–4379, 2004.
Ingalls, A. E., Liu, Z., and Lee, C.: Seasonal trends in the pigment and
amino acid compositions of sinking particles in biogenic CaCO3 and
SiO2 dominated regions of the Pacific sector of the Southern Ocean
along 170∘ W, Deep-Sea Res. Pt. I, 53, 836–859, 2006.
Ittekkot, V.: Verteilung von gelöstem organischen Kohlenstoff,
gelösten Zuckern und Aminosäuren in Fladengrund, nördliche
Nordsee (FLEX 1976), Mitt. Geol.-Paläont. Inst. Univ. Hamburg, Heft 51,
115–187, 1981.
Ittekkot, V. and Arain, R.: Nature of Particulate Organic-Matter in the
River Indus, Pakistan, Geochim. Cosmochim. Ac., 50, 1643–1653,
https://doi.org/10.1016/0016-7037(86)90127-4, 1986.
Ittekkot, V., Degens, E. T., and Honjo, S.: Seasonality in the fluxes of
sugars, amino acids, and amino sugars to the deep ocean: Panama Basin,
Deep-Sea Res., 31, 1071–1083, 1984a.
Ittekkot, V., Deuser, W. G., and Degens, E. T.: Seasonality in the fluxes of
sugars, amino acids, and amino sugars to the deep ocean: Sargasso Sea,
Deep-Sea Res., 31, 1057–1069, 1984b.
Ittekkot, V., Safiullah, S., and Arain, R.: Nature of Organic-Matter in
Rivers with Deep-Sea Connections – the Ganges-Brahmaputra and Indus, Sci. Total Environ., 58, 93–107, https://doi.org/10.1016/0048-9697(86)90080-x, 1986.
Jennerjahn, T. and Ittekkot, V.: Organic matter in sediments in the mangrove
areas and adjacent continental margins of Brazil: I. Amino acids and
hexosamines, Oceanol. Acta, 20, 359–369, 1997.
Kaiser, K. and Benner, R.: Biochemical composition and size distribution of
organic matter at the Pacific and Atlantic time-series stations, Mar.
Chem., 113, 63–77, https://doi.org/10.1016/j.marchem.2008.12.004,
2009.
Kandler, O.: Cell-wall structures in methane bacteria – evolution of
procaryotes, Naturwissenschaften, 66, 95–105, https://doi.org/10.1007/bf00373500, 1979.
Karl, D., Knauer, G. A., and Martin, A. P.: Downward flux of particulate
organic matter in the ocean: a particle composition paradox, Nature, 332,
438–441, 1988.
Keil, R. G. and Kirchman, D. L.: Dissolved Combined Amino Acids: Chemical
Form and Utilization by Marine Bacteria, Limnol. Oceanogr., 38,
1256–1270, 1993.
Keil, R. G. and Kirchman, D. L.: Abiotic Transformation of Labile Protein to
Refractory Protein in Sea-Water, Mar. Chem., 45, 187–196,
https://doi.org/10.1016/0304-4203(94)90002-7, 1994.
Keil, R. G. and Kirchman, D. L.: Utilization of dissolved protein and amino
acids in the northern Sargasso Sea, Aquat. Microb. Ecol., 18, 293–300, 1999.
Keil, R. G., Montlucon, D. B., Prahl, F. G., and Hedges, J. I.: Sorptive
Preservation of Labile Organic-Matter in Marine-Sediments, Nature, 370,
549–552, https://doi.org/10.1038/370549a0, 1994.
Kienast, M., Lehmann, M. F., Timmermann, A., Galbraith, E., Bolliet, T.,
Holboum, A., Normandeau, C., and Laj, C.: A mid-Holocene transition in the
nitrogen dynamics of the western equatorial Pacific: Evidence of a deepening
thermocline?, Geophys. Res. Lett., 35, L23610, https://doi.org/10.1029/2008gl035464,
2008.
Kim, T. H., Kim, G., Shen, Y., and Benner, R.: Strong linkages between
surface and deep-water dissolved organic matter in the East/Japan Sea,
Biogeosciences, 14, 2561–2570, https://doi.org/10.5194/bg-14-2561-2017, 2017.
King, K. J.: Amino acid composition of the silicified matrix in fossil
polycystine Radiolaria, Micropaleontology, 21, 215–226, 1975.
King, K. J. and Hare, P. E.: Amino acid composition of the test as a
taxonomic character for living and fossil planktonic foraminifera,
Micropaleontology, 18, 285–293, 1972.
Klein, I., von Rad, U., and Durner, J.: Homoserine lactones: do plants
really listen to bacterial talk?, Plant Signal. Behav., 4, 50–51,
2009.
Koppelmann, R., Bottger-Schnack, R., Mobius, J., and Weikert, H.: Trophic
relationships of zooplankton in the eastern Mediterranean based on stable
isotope measurements, J. Plankton Res., 31, 669–686, https://doi.org/10.1093/plankt/fbp013,
2009.
Lahajnar, N., Rixen, T., Gaye-Haake, B., Schafer, P., and Ittekkot, V.:
Dissolved organic carbon (DOC) fluxes of deep-sea sediments from the Arabian
Sea and NE Atlantic, Deep-Sea Res. Pt. II, 52,
1947–1964, https://doi.org/10.1016/j.dsr2.2005.05.006, 2005.
Lahajnar, N., Wiesner, M. G., and Gaye, B.: Fluxes of amino acids and
hexosamines to the deep South China Sea, Deep-Sea Res. Pt. I, 54, 2120–2144, https://doi.org/10.1016/j.dsr.2007.08.009, 2007.
Lam, P. J. and Marchal, O.: Insights into Particle Cycling from Thorium and
Particle Data, in: Annual Review of Marine Science, Vol 7, edited by:
Carlson, C. A. and Giovannoni, S. J., Annual Review of Marine Science,
Annual Reviews, Palo Alto, 159–184, https://doi.org/10.1146/annurev-marine-010814-015623,
2015.
Lee, C.: Amino acids and amine biogeochemistry in marine particulate
material and sediments, in: Nitrogen cycling in coastal marine environments,
edited by: Blackburn, T. H., and Sörensen, J., SCOPE, Wiley and Sons, 125–141, ISBN 0 471 91404 5,
1988.
Lee, C. and Cronin, C.: The vertical flux of particulate organic nitrogen in
the sea: decomposition of amino acids in the Peru upwelling area and the
equatorial Atlantic, J. Mar. Res., 40, 227–251, 1982.
Lee, C. and Cronin, C.: Particulate amino acids in the sea: Effects of
primary productivity and biological decomposition, J. Mar. Res., 42,
1075–1097, 1984.
Lee, C., Wakeham, S., and Arnosti, C.: Particulate organic matter in the
sea: The composition conundrum, Ambio, 33, 565–575,
https://doi.org/10.1639/0044-7447(2004)033[0565:pomits]2.0.co;2, 2004.
Legendre, L., Rivkin, R. B., Weinbauer, M. G., Guidi, L., and Uitz, J.: The
microbial carbon pump concept: Potential biogeochemical significance in the
globally changing ocean, Prog. Oceanogr., 134, 432–450,
https://doi.org/10.1016/j.pocean.2015.01.008, 2015.
Loh, A. N., Bauer, J. E., and Druffel, E. R. M.: Variable ageing and storage
of dissolved organic components in the open ocean, Nature, 430, 877–881,
https://doi.org/10.1038/nature02780, 2004.
Loick-Wilde, N., Weber, S. C., Eglite, E., Liskow, I., Schulz-Bull, D.,
Wasmund, N., Wodarg, D., and Montoya, J. P.: De novo amino acid synthesis
and turnover during N-2 fixation, Limnol. Oceanogr., 63, 1076–1092,
https://doi.org/10.1002/lno.10755, 2018.
Lonborg, C., Alvarez-Salgado, X. A., Letscher, R. T., and Hansell, D. A.:
Large Stimulation of Recalcitrant Dissolved Organic Carbon Degradation by
Increasing Ocean Temperatures, Front. Mar. Sci., 4, 436,
https://doi.org/10.3389/fmars.2017.00436, 2018.
Martin, J. H., Knauer, G. A., Karl, D. M., and Broenkow, W. W.: Vertex:
carbon cycling in the northeast Pacific, Deep-Sea Res., 34, 267–285,
1987.
Mayzaud, P. and Martin, J. L. M.: Some aspects of biochemical and mineral
composition of marine plankton J. Exp. Mar. Biol. Ecol., 17, 297–310,
https://doi.org/10.1016/0022-0981(75)90005-2, 1975.
McCarthy, M., Pratum, T., Hedges, J., and Benner, R.: Chemical composition
of dissolved organic nitrogen in the ocean, Nature, 390, 150–154,
https://doi.org/10.1038/36535, 1997.
McCarthy, M. D., Benner, R., Lee, C., Hedges, J. I., and Fogel, M. L.: Amino
acid carbon isotopic fractionation patterns in oceanic dissolved organic
matter: an unaltered photoautotrophic source for dissolved organic nitrogen
in the ocean?, Mar. Chem., 92, 123–134, 2004.
McCarthy, M. D., Benner, R., Lee, C., and Fogel, M. L.: Amino acid nitrogen
isotopic fractionation patterns as indicators of heterotrophy in plankton,
particulate, and dissolved organic matter, Geochim. Cosmochim. Ac.,
71, 4727–4744, https://doi.org/10.1016/j.gca.2007.06.061, 2007.
McCave, I. N.: Size spectra and aggregation of suspended particles in the
ocean, Deep-Sea Res., 31, 329–352, 1984.
Menzel, P., Anupama, K., Basavaiah, N., Das, B. K., Gaye, B., Herrmann, N.,
and Prasad, S.: The use of amino acid analyses in (palaeo-) limnological
investigations: A comparative study of four Indian lakes in different
climate regimes, Geochim. Cosmochim. Ac., 160, 25–37,
https://doi.org/10.1016/j.gca.2015.03.028, 2015.
Menzel, P., Gaye, B., Wiesner, M. G., Prasad, S., Stebich, M., Das, B. K.,
Anoop, A., Riedel, N., and Basavaiah, N.: Influence of bottom water anoxia
on nitrogen isotopic ratios and amino acid contributions of recent sediments
from small eutrophic Lonar Lake, Central India, Limnol. Oceanogr.,
58, 1061–1074, 2013.
Möbius, J.: Isotope fractionation during nitrogen remineralization
(ammonification): Implications for nitrogen isotope biogeochemistry,
Geochim. Cosmochim. Ac., 105, 422–432, 2013.
Möbius, J., Lahajnar, N., and Emeis, K.-C.: Diagenetic control on
nitrogen isotope ratios in Holocene sapropels and recent sediments from the
Eastern Mediterranean Sea, Biogeosciences 7, 3901–3914,
https://doi.org/10.5194/bg-7-3901-2010, 2010.
Möbius, J., Gaye, B., Lahajnar, N., Bahlmann, E., and Emeis, K.-C.:
Influence of diagenesis on sedimentary ä15N in the Arabian Sea over
the last 130 kyr, Mar. Geol., 284, 127–138, 2011.
Müller, P. J.:
Müller, P. J., Suess, E., and Ungerer, C. A.: Amino acids and amino sugars
of surface particulate and sediment trap material from waters of the Scotia
Sea Deep-Sea Res. Pt. A, 33, 819–838,
https://doi.org/10.1016/0198-0149(86)90090-7, 1986.
Nagel, B., Gaye, B., Kodina, L. A., and Lahajnar, N.: Stable carbon and
nitrogen isotopes as indicators for organic matter sources in the Kara Sea,
Mar. Geol., 266, 42–51, https://doi.org/10.1016/j.margeo.2009.07.010, 2009.
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.
Nagel, B., Gaye, B., Lahajnar, N., Struck, U., and Emeis, K.-C.: Effects of
current regimes and oxygenation on particulate matter preservation on the
Namibian shelf: Insights from amino acid biogeochemistry, Mar. Chem.,
186, 121–132, https://doi.org/10.1016/j.marchem.2016.09.001, 2016.
Niggemann, J. and Schubert, C. J.: Sources and fate of amino sugars in
coastal Peruvian sediments, Geochim. Cosmochim. Ac., 70, 2229–2237,
2006.
Niggemann, J., Lomstein, B. A., and Schubert, C. J.: Diagenesis of amino
compounds in water column and sediment of Lake Baikal, Org. Geochem., 115,
67–77, https://doi.org/10.1016/j.orggeochem.2017.10.008, 2018.
Orellana, M. V. and Leck, C.: Marine Microgels, Biogeochemistry of Marine
Dissolved Organic Matter, 2nd Edn., Academic Press Ltd.-Elsevier Science
Ltd., London, 451–480, https://doi.org/10.1016/b978-0-12-405940-5.00009-1, 2015.
Pantoja, S., Sepúlveda, J., and Gonzálvez, H. E.: Decomposition of
sinking proteinaceous material during fall in the oxygen minimum zone off
northern Chile, Deep-Sea Res. Pt. I, 51, 55–70, 2004.
Parsek, M. R., Val, D. L., Hanzelka, B. L., Cronan Jr., J. E., and
Greenberg, E. P.: Acyl homoserine-lactone quorum-sensing signal generation,
P. Natl. Acad. Sci. USA, 96, 4360–4365, 1999.
Paul, S. A. L., Koschinsky, A., Gaye, B., and Dähnke, K.: N-isotopes and amino acids from sediment multi cores of SONNE cruise SO242/1 at the DISCOL area, Peru Basin, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.881804, 2017a.
Paul, S. A. L., Koschinsky, A., Gaye, B., and Dähnke, K.: N-isotopes and amino acids from sediment push cores of SONNE cruise SO242/2 at the DISCOL area, Peru Basin, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.881813, 2017b.
Paul, S. A. L., Koschinsky, A., Gaye, B., and Dähnke, K.: N-isotopes and amino acids from CTD station SO242/1_58-1_CTD 4 at the DISCOL area, Peru Basin, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.885391, 2017c.
Paul, S. A. L., Gaye, B., Haeckel, M., Kasten, S., and Koschinsky, A.:
Biogeochemical Regeneration of a Nodule Mining Disturbance Site: Trace
Metals, DOC and Amino Acids in Deep-Sea Sediments and Pore Waters, Front. Mar. Sci., 5, 117, https://doi.org/10.3389/fmars.2018.00117, 2018.
Peter, S., Shen Y., Kaiser, K., Benner, R., and Durisch-Kaiser, E.:
Bioavailability and diagenetic state of dissolved organic matter in riparian
groundwater, J. Geophys. Res. Geophys.l Res.h, 117,
G04006, https://doi.org/10.1029/2012JG002072, 2012.
Peters, B. D., Lam, P. J., and Casciotti, K. L.: Nitrogen and oxygen isotope
measurements of nitrate along the US GEOTRACES Eastern Pacific Zonal
Transect (GP16) yield insights into nitrate supply, remineralization, and
water mass transport, Mar. Chem., 201, 137–150,
https://doi.org/10.1016/j.marchem.2017.09.009, 2018.
Pilskaln, C. H. and Honjo, S.: The fecal pellet fraction of biogeochemical
particle fluxes to the deep sea, Global Biogeochem. Cy., 1, 31–48,
1987.
Reinthaler, T., van Aken, H., Veth, C., Aristegui, J., Robinson, C.,
Williams, P., Lebaron, P., and Herndl, G. J.: Prokaryotic respiration and
production in the meso- and bathypelagic realm of the eastern and western
North Atlantic basin, Limnol. Oceanogr., 51, 1262–1273,
https://doi.org/10.4319/lo.2006.51.3.1262, 2006.
Resplandy, L., Lévy, M., and McGillicuddy Jr., D. J.: Effects of
Eddy-Driven Subduction on Ocean Biological Carbon Pump, Global
Biogeochem. Cy., 33, 1071–1084, https://doi.org/10.1029/2018GB006125,
2019.
Riccardi, G., Derossi, E., and Milano, A.: Amino acid biosynthesis and its
regulation in cyanobacteria, Plant Sci., 64, 135–151,
https://doi.org/10.1016/0168-9452(89)90018-6, 1989.
Ridgwell, A. and Arndt, S.: Why Dissolved Organics Matter: DOC in Ancient
Oceans and Past Climate Change, Biogeochemistry of Marine Dissolved Organic
Matter, 2nd Edn., Academic Press Ltd.-Elsevier Science Ltd., London, 1–20,
https://doi.org/10.1016/b978-0-12-405940-5.00001-7, 2015.
Rixen, T., Guptha, M. V. S., and Ittekkot, V.: Sedimentation, in: Report of
the Indian Ocean Synthesis Group on the Arabian Sea Process Study, edited
by: Burkill, P. and Smith, S. L., JGOFS Report 35, JGOFS International Project Office, Bergen, 65–73,
2002.
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.
Rixen, T., Gaye, B., and Emeis, K.-C.: The monsoon, carbon fluxes, and the
organic carbon pump in the northern Indian Ocean, Prog. Oceanogr.,
175, 24–39, https://doi.org/10.1016/j.pocean.2019.03.001, 2019a.
Rixen, T., Gaye, B., Emeis, K. C., and Ramaswamy, V.: The ballast effect of
lithogenic matter and its influences on the carbon fluxes in the Indian
Ocean, Biogeosciences, 16, 485–503, https://doi.org/10.5194/bg-16-485-2019, 2019b.
Robinson, R. S., Kienast, M., Luiza Albuquerque, A., Altabet, M., Contreras, S., De Pol Holz, R., Dubois, N., Francois, R., Galbraith, E., Hsu, T.-C., Ivanochko, T., Jaccard, S., Kao, S.-J., Kiefer, T., Kienast, S., Lehmann, M., Martinez, P., McCarthy, M., Möbius, J., Pedersen, T., Quan, T. M., Ryabenko, E., Schmittner, A., Schneider, R., Schneider-Mor, A., Shigemitsu, M., Sinclair, D., Somes, C., Studer, A., Thunell, R., and Yang, J.-Y.: A review of nitrogen isotopic alteration in marine
sediments, Paleoceanography, 27, PA4203, https://doi.org/10.1029/2012PA002321, 2012.
Rontani, J.-F., Zabeti, N., and Wakeham, S. G.: Degradation of particulate
organic matter in the equatorial Pacific Ocean: Biotic or abiotic?,
Limnol. Oceanogr., 56, 333–349, 2011.
Satterberg, J., Arnarson, T. S., Lessard, E. J., and Keil, R. G.: Sorption
of organic matter from four phytoplankton species to montmorillonite,
chlorite and kaolinite in seawater, Mar. Chem., 81, 11–18,
https://doi.org/10.1016/s0304-4203(02)00136-6, 2003.
Sheridan, C. C., Lee, C., Wakeham, S. G., and Bishop, J. K. B.: Suspended
particle organic composition and cycling in surface and midwaters of the
equatorial Pacific Ocean, Deep-Sea Res. Pt. I, 49, 1983–2008, 2002.
Silver, M. W., Coale, S. L., Pilskaln, C. H., and Steinberg, D. R.: Giant
aggregates: Importance as microbial centers and agents of material flux in
the mesopelagic zone, Limnol. Oceanogr., 43, 498–507, 1998.
Smith, D. C., Simon, M., Alldredge, A. L., and Azam, F.: Intense hydrolytic
enzyme activity on marine aggregates and implications for rapid particle
dissolution, Nature, 359, 139–142, 1992.
Suess, E.: Particulate organic carbon flux in the oceans – surface
productivity and oxygen utilization, Nature, 288, 260–263, 1980.
Sun, Y., Zulla, M., Joachimski, M., Bond, D., Wignall, P., Zhang, Z., and
Zhang, M.: Ammonium ocean following the end-Permian mass extinction, Earth
Planet. Sc. Lett., 518, 211–222, https://doi.org/10.1016/j.epsl.2019.04.036, 2019.
Suthhof, A., Jennerjahn, T. C., Schäfer, P., and Ittekkot, V.: Nature of
organic matter in surface sediments from the Pakistan continental margin and
the deep Arabian Sea: amino acids, Deep-Sea Res. Pt. II, 47, 329–351, 2000.
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.
Taylor, G. T.: Microbial degradation of sorbed and dissolved protein in
seawater, Limnol. Oceanogr., 40, 875–885, 1995.
Tesdal, J. E., Galbraith, E. D., and Kienast, M.: Nitrogen isotopes in bulk
marine sediment: linking seafloor observations with subseafloor records,
Biogeosciences, 10, 101–118, https://doi.org/10.5194/bg-10-101-2013, 2013.
Turnewitsch, R., Lahajnar, N., Haeckel, M., and Christiansen, B.: An abyssal
hill fractionates organic and inorganic matter in deep-sea surface
sediments, Geophys. Res. Lett., 42, 7663–7672,
https://doi.org/10.1002/2015gl065658, 2015.
Turnewitsch, R., Dale, A., Lahajnar, N., Lampitt, R. S., and Sakamoto, K.:
Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal
near-seafloor water column?, Prog. Oceanogr., 154, 1–24,
https://doi.org/10.1016/j.pocean.2017.04.006, 2017.
Unger, D., Gaye-Haake, B., Gebhardt, A. C., and Ittekkot, V.:
Biogeochemistry of suspended and sedimentary material from the Ob and
Yenisei rivers and the adjacent Kara Sea: Amino acids and amino sugars,
Cont. Shelf Res., 25, 437–460, 2005.
Wakeham, S. G. and Canuel, E. A.: Organic geochemistry of particulate matter
in the eastern tropical North Pacific; Implications for particle dynamics,
J. Mar. Res., 46, 183–213, 1988.
Wakeham, S. G. and Lee, C.: Organic geochemistry of particulate matter in
the ocean – the role of particles in oceanic sedimentary cycles, Org.
Geochem., 14, 83–96, https://doi.org/10.1016/0146-6380(89)90022-3, 1989.
Wakeham, S. G. and Lee, C.: Production, Transport, and Alteration of
Particulate Organic Matter in the Marine Water Column, in: Organic
Geochemistry: Principles and Applications, edited by: Engel, M. H. and
Macko, S. A., Springer US, Boston, MA, 145–169,
https://doi.org/10.1007/978-1-4615-2890-6_6, 1993.
Wakeham, S. G., Lee, C., Farrington, J. W., and Gagosian, R. B.:
Biogechemistry of particulate organic matter in the oceans: results from
sediment trap experiments, Deep-Sea Res., 31, 509–528, 1984.
Walla, M. D., Lau, P. Y., Morgan, S. L., Fox, A., and Brown, A.: Capillary
gas chromatography-mass spectrometry of carbohydrate components of
legionellae and other bacteria, J. Chromatogr. A, 288, 399–413,
https://doi.org/10.1016/S0021-9673(01)93716-1, 1984.
Waples, D. W. and Sloan, J. R.: Carbon and nitrogen diagenesis in deep-sea
sediments, Geochim. Cosmochim. Ac., 44, 1463–1470,
https://doi.org/10.1016/0016-7037(80)90111-8, 1980.
Whelan, J. K. and Emeis, K.-C.: Preservation of amino acids and
carbohydrates in marine sediments, in: Organic Matter: Productivity,
Accumulation, and Preservation in Recent and Ancient Sediments, edited by:
Whelan, J. K. and Farrington, J., Columbia University Press, Palisades, N.
Y., 176–200, ISBN 0 231 07162 0, 1992.
Wilson, J. D., Barker, S., and Ridgwell, A.: Assessment of the spatial
variability in particulate organic matter and mineral sinking fluxes in the
ocean interior: Implications for the ballast hypothesis, Global
Biogeochem. Cy., 26, GB4011, https://doi.org/10.1029/2012gb004398, 2012.
Xue, J. H., Lee, C., Wakeham, S. G., and Armstrong, R. A.: Using principal
components analysis (PCA) with cluster analysis to study the organic
geochemistry of sinking particles in the ocean, Org. Geochem., 42, 356–367,
https://doi.org/10.1016/j.orggeochem.2011.01.012, 2011.
Yamaguchi, Y. T. and McCarthy, M. D.: Sources and transformation of
dissolved and particulate organic nitrogen in the North Pacific Subtropical
Gyre indicated by compound-specific ä15N analysis of amino acids,
Geochim. Cosmochim. Ac., 220, 329–347, https://doi.org/10.1016/j.gca.2017.07.036, 2018.
Yang, J.-Y. T., Kao, S.-J., Dai, M., Yan, X., and Lin, H.-L.: Examining N
cycling in the northern South China Sea from N isotopic signals in nitrate
and particulate phases, J. Geophys. Res.-Biogeo.,
122, 2118–2136, https://doi.org/10.1002/2016JG003618, 2017.
Zhang, P. Y., Yang, G. P., Chen, Y., Leng, W. S., and Ji, C. X.: Temporal
and spatial variations of particulate and dissolved amino acids in the East
China Sea, Mar. Chem., 186, 133–144, https://doi.org/10.1016/j.marchem.2016.09.004,
2016.
Short summary
Amino acids were analyzed in a large number of samples of particulate and dissolved organic matter from coastal regions and the open ocean. A statistical analysis produced two new biogeochemical indicators. An indicator of sinking particle and sediment degradation (SDI) traces the degradation of organic matter from the surface waters into the sediments. A second indicator shows the residence time of suspended matter in the ocean (RTI).
Amino acids were analyzed in a large number of samples of particulate and dissolved organic...
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