Articles | Volume 19, issue 24
https://doi.org/10.5194/bg-19-5973-2022
© 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-19-5973-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Dec 2022
Research article |
| 22 Dec 2022
Nitrate isotope investigations reveal future impacts of climate change on nitrogen inputs and cycling in Arctic fjords: Kongsfjorden and Rijpfjorden (Svalbard)
Marta Santos-Garcia
CORRESPONDING AUTHOR
School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE,
United Kingdom
Raja S. Ganeshram
School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE,
United Kingdom
Robyn E. Tuerena
School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE,
United Kingdom
Scottish Association for Marine Science, Dunstaffnage, PA37 1QA,
United Kingdom
Margot C. F. Debyser
School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE,
United Kingdom
Katrine Husum
Norwegian Polar Institute, Fram Centre, 9296, Tromsø, Norway
Philipp Assmy
Norwegian Polar Institute, Fram Centre, 9296, Tromsø, Norway
Haakon Hop
Norwegian Polar Institute, Fram Centre, 9296, Tromsø, Norway
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Xin Yang, Kimberly Strong, Alison S. Criscitiello, Marta Santos-Garcia, Kristof Bognar, Xiaoyi Zhao, Pierre Fogal, Kaley A. Walker, Sara M. Morris, and Peter Effertz
EGUsphere, https://doi.org/10.5194/egusphere-2022-696, https://doi.org/10.5194/egusphere-2022-696, 2022
Preprint archived
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Snow pack in high Arctic plays a key role in polar atmospheric chemistry, especially in spring when photochemistry becomes active. By sampling surface snow from a Canadian high Arctic location at Eureka, Nunavut (80° N, 86° W), we demonstrate that surface snow is a net sink rather than a source of atmospheric reactive bromine and nitrate. This finding is new and opposite to previous conclusions that snowpack is a large and direct source of reactive bromine in polar spring.
Adam Francis, Raja S. Ganeshram, Robyn E. Tuerena, Robert G. M. Spencer, Robert M. Holmes, Jennifer A. Rogers, and Claire Mahaffey
Biogeosciences, 20, 365–382, https://doi.org/10.5194/bg-20-365-2023, https://doi.org/10.5194/bg-20-365-2023, 2023
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Climate change is causing extensive permafrost degradation and nutrient releases into rivers with great ecological impacts on the Arctic Ocean. We focused on nitrogen (N) release from this degradation and associated cycling using N isotopes, an understudied area. Many N species are released at degradation sites with exchanges between species. N inputs from permafrost degradation and seasonal river N trends were identified using isotopes, helping to predict climate change impacts.
Margot C. F. Debyser, Laetitia Pichevin, Robyn E. Tuerena, Paul A. Dodd, Antonia Doncila, and Raja S. Ganeshram
Biogeosciences, 19, 5499–5520, https://doi.org/10.5194/bg-19-5499-2022, https://doi.org/10.5194/bg-19-5499-2022, 2022
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We focus on the exchange of key nutrients for algae production between the Arctic and Atlantic oceans through the Fram Strait. We show that the export of dissolved silicon here is controlled by the availability of nitrate which is influenced by denitrification on Arctic shelves. We suggest that any future changes in the river inputs of silica and changes in denitrification due to climate change will impact the amount of silicon exported, with impacts on Atlantic algal productivity and ecology.
Hanna M. Kauko, Philipp Assmy, Ilka Peeken, Magdalena Różańska-Pluta, Józef M. Wiktor, Gunnar Bratbak, Asmita Singh, Thomas J. Ryan-Keogh, and Sebastien Moreau
Biogeosciences, 19, 5449–5482, https://doi.org/10.5194/bg-19-5449-2022, https://doi.org/10.5194/bg-19-5449-2022, 2022
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This article studies phytoplankton (microscopic
plantsin the ocean capable of photosynthesis) in Kong Håkon VII Hav in the Southern Ocean. Different species play different roles in the ecosystem, and it is therefore important to assess the species composition. We observed that phytoplankton blooms in this area are formed by large diatoms with strong silica armors, which can lead to high silica (and sometimes carbon) export to depth and be important prey for krill.
Xin Yang, Kimberly Strong, Alison S. Criscitiello, Marta Santos-Garcia, Kristof Bognar, Xiaoyi Zhao, Pierre Fogal, Kaley A. Walker, Sara M. Morris, and Peter Effertz
EGUsphere, https://doi.org/10.5194/egusphere-2022-696, https://doi.org/10.5194/egusphere-2022-696, 2022
Preprint archived
Short summary
Short summary
Snow pack in high Arctic plays a key role in polar atmospheric chemistry, especially in spring when photochemistry becomes active. By sampling surface snow from a Canadian high Arctic location at Eureka, Nunavut (80° N, 86° W), we demonstrate that surface snow is a net sink rather than a source of atmospheric reactive bromine and nitrate. This finding is new and opposite to previous conclusions that snowpack is a large and direct source of reactive bromine in polar spring.
Kevin Zoller, Jan Sverre Laberg, Tom Arne Rydningen, Katrine Husum, and Matthias Forwick
EGUsphere, https://doi.org/10.5194/egusphere-2022-970, https://doi.org/10.5194/egusphere-2022-970, 2022
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Marine geologic data from NE Greenland provides new information about the behavior of the Greenland Ice Sheet during the last glacial period. Seafloor landforms suggest that a large, fast flowing ice stream moved south through Dove Bugt. Southern Dove Bugt was deglaciated from 11.2 ka BP, and evidence suggests that during a warmer than present period in the first part of the present interglacial (Holocene), grounded ice in the region had reached to or beyond its present-day position.
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.
Pedro Duarte, Philipp Assmy, Karley Campbell, and Arild Sundfjord
Geosci. Model Dev., 15, 841–857, https://doi.org/10.5194/gmd-15-841-2022, https://doi.org/10.5194/gmd-15-841-2022, 2022
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Sea ice modeling is an important part of Earth system models (ESMs). The results of ESMs are used by the Intergovernmental Panel on Climate Change in their reports. In this study we present an improvement to calculate the exchange of nutrients between the ocean and the sea ice. This nutrient exchange is an essential process to keep the ice-associated ecosystem functioning. We found out that previous calculation methods may underestimate the primary production of the ice-associated ecosystem.
Maria-Theresia Verwega, Christopher J. Somes, Markus Schartau, Robyn Elizabeth Tuerena, Anne Lorrain, Andreas Oschlies, and Thomas Slawig
Earth Syst. Sci. Data, 13, 4861–4880, https://doi.org/10.5194/essd-13-4861-2021, https://doi.org/10.5194/essd-13-4861-2021, 2021
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This work describes a ready-to-use collection of particulate organic carbon stable isotope ratio data sets. It covers the 1960s–2010s and all main oceans, providing meta-information and gridded data. The best coverage exists in Atlantic, Indian and Southern Ocean surface waters during the 1990s. It indicates no major difference between methods and shows decreasing values towards high latitudes, with the lowest in the Southern Ocean, and a long-term decline in all regions but the Southern Ocean.
Robyn E. Tuerena, Joanne Hopkins, Raja S. Ganeshram, Louisa Norman, Camille de la Vega, Rachel Jeffreys, and Claire Mahaffey
Biogeosciences, 18, 637–653, https://doi.org/10.5194/bg-18-637-2021, https://doi.org/10.5194/bg-18-637-2021, 2021
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The Barents Sea is a rapidly changing shallow sea within the Arctic. Here, nitrate, an essential nutrient, is fully consumed by algae in surface waters during summer months. Nitrate is efficiently regenerated in the Barents Sea, and there is no evidence for nitrogen loss from the sediments by denitrification, which is prevalent on other Arctic shelves. This suggests that nitrogen availability in the Barents Sea is largely determined by the supply of nutrients in water masses from the Atlantic.
Ingrid Leirvik Olsen, Tom Arne Rydningen, Matthias Forwick, Jan Sverre Laberg, and Katrine Husum
The Cryosphere, 14, 4475–4494, https://doi.org/10.5194/tc-14-4475-2020, https://doi.org/10.5194/tc-14-4475-2020, 2020
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We present marine geoscientific data from Store Koldewey Trough, one of the largest glacial troughs offshore NE Greenland, to reconstruct the ice drainage pathways, ice sheet extent and ice stream dynamics of this sector during the last glacial and deglaciation. The complex landform assemblage in the trough reflects a dynamic retreat with several periods of stabilization and readvances, interrupting the deglaciation. Estimates indicate that the ice front locally retreated between 80–400 m/year.
Lisa Claire Orme, Xavier Crosta, Arto Miettinen, Dmitry V. Divine, Katrine Husum, Elisabeth Isaksson, Lukas Wacker, Rahul Mohan, Olivier Ther, and Minoru Ikehara
Clim. Past, 16, 1451–1467, https://doi.org/10.5194/cp-16-1451-2020, https://doi.org/10.5194/cp-16-1451-2020, 2020
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A record of past sea temperature in the Indian sector of the Southern Ocean, spanning the last 14 200 years, has been developed by analysis of fossil diatoms in marine sediment. During the late deglaciation the reconstructed temperature changes were highly similar to those over Antarctica, most likely due to a reorganisation of global ocean and atmospheric circulation. During the last 11 600 years temperatures gradually cooled and became increasingly variable.
Robyn E. Tuerena, Raja S. Ganeshram, Matthew P. Humphreys, Thomas J. Browning, Heather Bouman, and Alexander P. Piotrowski
Biogeosciences, 16, 3621–3635, https://doi.org/10.5194/bg-16-3621-2019, https://doi.org/10.5194/bg-16-3621-2019, 2019
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The carbon isotopes in algae can be used to predict food sources and environmental change. We explore how dissolved carbon is taken up by algae in the South Atlantic Ocean and how this affects their carbon isotope signature. We find that cell size controls isotope fractionation. We use our results to investigate how climate change may impact the carbon isotopes in algae. We suggest a shift to smaller algae in this region would decrease the carbon isotope ratio at the base of the food web.
S. M. P. Berben, K. Husum, P. Cabedo-Sanz, and S. T. Belt
Clim. Past, 10, 181–198, https://doi.org/10.5194/cp-10-181-2014, https://doi.org/10.5194/cp-10-181-2014, 2014
D. E. Groot, S. Aagaard-Sørensen, and K. Husum
Clim. Past, 10, 51–62, https://doi.org/10.5194/cp-10-51-2014, https://doi.org/10.5194/cp-10-51-2014, 2014
C. V. Dylmer, J. Giraudeau, V. Hanquiez, and K. Husum
Biogeosciences Discuss., https://doi.org/10.5194/bgd-10-15077-2013, https://doi.org/10.5194/bgd-10-15077-2013, 2013
Revised manuscript has not been submitted
C. V. Dylmer, J. Giraudeau, F. Eynaud, K. Husum, and A. De Vernal
Clim. Past, 9, 1505–1518, https://doi.org/10.5194/cp-9-1505-2013, https://doi.org/10.5194/cp-9-1505-2013, 2013
Related subject area
Biogeochemistry: Stable Isotopes & Other Tracers
Determination of respiration and photosynthesis fractionation factors for atmospheric dioxygen inferred from a vegetation–soil–atmosphere analogue of the terrestrial biosphere in closed chambers
Downpour Dynamics: Outsized impacts of storm events on unprocessed atmospheric nitrate export in an urban watershed
Permafrost degradation and nitrogen cycling in Arctic rivers: insights from stable nitrogen isotope studies
Neodymium budget in the Mediterranean Sea: evaluating the role of atmospheric dusts using a high-resolution dynamical-biogeochemical model
The hidden role of dissolved organic carbon in the biogeochemical cycle of carbon in modern redox-stratified lakes
Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany's largest drinking water reservoir
Partitioning of carbon export in the upper water column of the oligotrophic South China Sea
Carbon isotopic ratios of modern C3 and C4 vegetation on the Indian peninsula and changes along the plant–soil–river continuum – implications for vegetation reconstructions
Controls on nitrite oxidation in the upper Southern Ocean: insights from winter kinetics experiments in the Indian sector
A comparative isotopic study of the biogeochemical cycle of carbon in modern stratified lakes: the hidden role of DOC
Tracing the source of nitrate in a forested stream showing elevated concentrations during storm events
Intra-skeletal variability in phosphate oxygen isotope composition reveals regional heterothermies in marine vertebrates
Isotopic differences in soil–plant–atmosphere continuum composition and control factors of different vegetation zones on the northern slope of the Qilian Mountains
An analysis of the variability in δ13C in macroalgae from the Gulf of California: indicative of carbon concentration mechanisms and isotope discrimination during carbon assimilation
Summertime productivity and carbon export potential in the Weddell Sea, with a focus on the waters adjacent to Larsen C Ice Shelf
Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)
Hydrogen and carbon isotope fractionation factors of aerobic methane oxidation in deep-sea water
Host-influenced geochemical signature in the parasitic foraminifera Hyrrokkin sarcophaga
Comparing modified substrate-induced respiration with selective inhibition (SIRIN) and N2O isotope approaches to estimate fungal contribution to denitrification in three arable soils under anoxic conditions
How are oxygen budgets influenced by dissolved iron and growth of oxygenic phototrophs in an iron-rich spring system? Initial results from the Espan Spring in Fürth, Germany
Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin
High-resolution 14C bomb peak dating and climate response analyses of subseasonal stable isotope signals in wood of the African baobab – a case study from Oman
Geographic variability in freshwater methane hydrogen isotope ratios and its implications for global isotopic source signatures
Seasonality of nitrogen sources, cycling, and loading in a New England river discerned from nitrate isotope ratios
Evaluating the response of δ13C in Haloxylon ammodendron, a dominant C4 species in Asian desert ecosystems, to water and nitrogen addition as well as the availability of its δ13C as an indicator of water use efficiency
Modern silicon dynamics of a small high-latitude subarctic lake
Radium-228-derived ocean mixing and trace element inputs in the South Atlantic
Nitrogen isotopic fractionations during nitric oxide production in an agricultural soil
Silicon uptake and isotope fractionation dynamics by crop species
Barium stable isotopes as a fingerprint of biological cycling in the Amazon River basin
Bottomland hardwood forest growth and stress response to hydroclimatic variation: evidence from dendrochronology and tree ring Δ13C values
N2O isotope approaches for source partitioning of N2O production and estimation of N2O reduction – validation with the 15N gas-flux method in laboratory and field studies
Technical note: Single-shell δ11B analysis of Cibicidoides wuellerstorfi using femtosecond laser ablation MC-ICPMS and secondary ion mass spectrometry
Biogeochemical evidence of anaerobic methane oxidation and anaerobic ammonium oxidation in a stratified lake using stable isotopes
Effects of 238U variability and physical transport on water column 234Th downward fluxes in the coastal upwelling system off Peru
Do degree and rate of silicate weathering depend on plant productivity?
Alpine Holocene tree-ring dataset: age-related trends in the stable isotopes of cellulose show species-specific patterns
Ideas and perspectives: The same carbon behaves like different elements – an insight into position-specific isotope distributions
Seasonal dynamics of the COS and CO2 exchange of a managed temperate grassland
Leaf-scale quantification of the effect of photosynthetic gas exchange on Δ17O of atmospheric CO2
The stable carbon isotope signature of methane produced by saprotrophic fungi
Understanding the effects of early degradation on isotopic tracers: implications for sediment source attribution using compound-specific isotope analysis (CSIA)
Oxygen isotope composition of waters recorded in carbonates in strong clumped and oxygen isotopic disequilibrium
Isotopic evidence for alteration of nitrous oxide emissions and producing pathways' contribution under nitrifying conditions
Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust
Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica
Changes in gross oxygen production, net oxygen production, and air-water gas exchange during seasonal ice melt in Whycocomagh Bay, a Canadian estuary in the Bras d'Or Lake system
Plants or bacteria? 130 years of mixed imprints in Lake Baldegg sediments (Switzerland), as revealed by compound-specific isotope analysis (CSIA) and biomarker analysis
Commercial traceability of Arapaima spp. fisheries in the Amazon basin: can biogeochemical tags be useful?
Distribution of Fe isotopes in particles and colloids in the salinity gradient along the Lena River plume, Laptev Sea
Clémence Paul, Clément Piel, Joana Sauze, Nicolas Pasquier, Frédéric Prié, Sébastien Devidal, Roxanne Jacob, Arnaud Dapoigny, Olivier Jossoud, Alexandru Milcu, and Amaëlle Landais
Biogeosciences, 20, 1047–1062, https://doi.org/10.5194/bg-20-1047-2023, https://doi.org/10.5194/bg-20-1047-2023, 2023
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To improve the interpretation of the δ18Oatm and Δ17O of O2 in air bubbles in ice cores, we need to better quantify the oxygen fractionation coefficients associated with biological processes. We performed a simplified analogue of the terrestrial biosphere in a closed chamber. We found a respiration fractionation in agreement with the previous estimates at the microorganism scale, and a terrestrial photosynthetic fractionation was found. This has an impact on the estimation of the Dole effect.
Joel Bostic, David Nelson, and Keith Eshleman
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-40, https://doi.org/10.5194/bg-2023-40, 2023
Revised manuscript accepted for BG
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Land-use changes can affect water quality. We used tracers of pollution sources and water flow paths to show that an urban watershed exports variable sources during storm events relative to a less developed watershed. Our results imply that changing precipitation patterns combined with increasing urbanization may alter sources of pollution in the future.
Adam Francis, Raja S. Ganeshram, Robyn E. Tuerena, Robert G. M. Spencer, Robert M. Holmes, Jennifer A. Rogers, and Claire Mahaffey
Biogeosciences, 20, 365–382, https://doi.org/10.5194/bg-20-365-2023, https://doi.org/10.5194/bg-20-365-2023, 2023
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Climate change is causing extensive permafrost degradation and nutrient releases into rivers with great ecological impacts on the Arctic Ocean. We focused on nitrogen (N) release from this degradation and associated cycling using N isotopes, an understudied area. Many N species are released at degradation sites with exchanges between species. N inputs from permafrost degradation and seasonal river N trends were identified using isotopes, helping to predict climate change impacts.
Mohamed Ayache, Jean-Claude Dutay, Kazuyo Tachikawa, Thomas Arsouze, and Catherine Jeandel
Biogeosciences, 20, 205–227, https://doi.org/10.5194/bg-20-205-2023, https://doi.org/10.5194/bg-20-205-2023, 2023
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The neodymium (Nd) is one of the most useful tracers to fingerprint water mass provenance. However, the use of Nd is hampered by the lack of adequate quantification of the external sources. Here, we present the first simulation of dissolved Nd concentration and Nd isotopic composition in the Mediterranean Sea using a high-resolution model. We aim to better understand how the various external sources affect the Nd cycle and particularly assess how it is impacted by atmospheric inputs.
Robin Havas, Christophe Thomazo, Miguel Iniesto, Didier Jézéquel, David Moreira, Rosaluz Tavera, Jeanne Caumartin, Elodie Muller, Purificación López-García, and Karim Benzerara
EGUsphere, https://doi.org/10.5194/egusphere-2023-23, https://doi.org/10.5194/egusphere-2023-23, 2023
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Dissolved organic carbon (DOC) is a reservoir of prime importance in the C cycle of both continental and marine systems. It has also been suggested to influence the past Earth climate, but is still poorly characterized in ancient Earth's-like environments. In this paper we show how DOC analyses from modern redox-stratified lakes can evidence specific metabolic reactions and environmental factors and how it can help us to interpret the C cycle of specific periods in the Earth's past.
Marlene Dordoni, Michael Seewald, Karsten Rinke, Kurt Friese, Robert van Geldern, Jakob Schmidmeier, and Johannes A. C. Barth
Biogeosciences, 19, 5343–5355, https://doi.org/10.5194/bg-19-5343-2022, https://doi.org/10.5194/bg-19-5343-2022, 2022
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Organic matter (OM) turnover into dissolved inorganic carbon (DIC) was investigated by means of carbon isotope mass balances in Germany's largest water reservoir. This includes a metalimnetic oxygen minimum (MOM). Autochthonous particulate organic carbon (POC) was the main contributor to DIC, with rates that were highest for the MOM. Generally low turnover rates outline the environmental fragility of this water body in the case that OM loads increase due to storm events or land use changes.
Yifan Ma, Kuanbo Zhou, Weifang Chen, Junhui Chen, Jin-Yu Terence Yang, and Minhan Dai
Biogeosciences Discuss., https://doi.org/10.5194/bg-2022-196, https://doi.org/10.5194/bg-2022-196, 2022
Revised manuscript accepted for BG
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We distinguished particulate organic carbon (POC) export fluxes out of the nutrient-depleted layer (NDL) and the euphotic zone. The amount of POC export flux at the NDL base suggests that the NDL could be hotspots of particle export. The substantial POC export flux at the NDL base challenges traditional concepts that the NDL was limited for POC export. The dominant nutrient source for POC export fluxes should be subsurface nutrients which was determined by 15N isotopic mass balance.
Frédérique M. S. A. Kirkels, Hugo J. de Boer, Paulina Concha Hernández, Chris R. T. Martes, Marcel T. J. van der Meer, Sayak Basu, Muhammed O. Usman, and Francien Peterse
Biogeosciences, 19, 4107–4127, https://doi.org/10.5194/bg-19-4107-2022, https://doi.org/10.5194/bg-19-4107-2022, 2022
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The distinct carbon isotopic values of C3 and C4 plants are widely used to reconstruct past hydroclimate, where more C3 plants reflect wetter and C4 plants drier conditions. Here we examine the impact of regional hydroclimatic conditions on plant isotopic values in the Godavari River basin, India. We find that it is crucial to identify regional plant isotopic values and consider drought stress, which introduces a bias in C3 / C4 plant estimates and associated hydroclimate reconstructions.
Mhlangabezi Mdutyana, Tanya Marshall, Xin Sun, Jessica M. Burger, Sandy J. Thomalla, Bess B. Ward, and Sarah E. Fawcett
Biogeosciences, 19, 3425–3444, https://doi.org/10.5194/bg-19-3425-2022, https://doi.org/10.5194/bg-19-3425-2022, 2022
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Nitrite-oxidizing bacteria in the winter Southern Ocean show a high affinity for nitrite but require a minimum (i.e., "threshold") concentration before they increase their rates of nitrite oxidation significantly. The classic Michaelis–Menten model thus cannot be used to derive the kinetic parameters, so a modified equation was employed that also yields the threshold nitrite concentration. Dissolved iron availability may play an important role in limiting nitrite oxidation.
Robin Havas, Christophe Thomazo, Miguel Iniesto, Didier Jézéquel, David Moreira, Rosaluz Tavera, Jeanne Caumartin, Elodie Muller, Purificación López-García, and Karim Benzerara
Biogeosciences Discuss., https://doi.org/10.5194/bg-2022-149, https://doi.org/10.5194/bg-2022-149, 2022
Revised manuscript accepted for BG
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In this work, we demonstrate the important role that dissolved organic C (DOC) may have on the C cycle of modern stratified water bodies, a necessary step to assess its relevance in Primitive-Earth-like conditions. Notably, the DOC chemical signatures reveal the presence of anoxygenic microorganisms. However, these signatures can vary significantly according to the environmental context. High concentrations of DOC also show its potential for storing large amounts of C in aquatic environments.
Weitian Ding, Urumu Tsunogai, Fumiko Nakagawa, Takashi Sambuichi, Hiroyuki Sase, Masayuki Morohashi, and Hiroki Yotsuyanagi
Biogeosciences, 19, 3247–3261, https://doi.org/10.5194/bg-19-3247-2022, https://doi.org/10.5194/bg-19-3247-2022, 2022
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Excessive leaching of nitrate from forested catchments during storm events degrades water quality and causes eutrophication in downstream areas. Thus, tracing the source of nitrate increase during storm events in forested streams is important for sustainable forest management. Based on the isotopic compositions of stream nitrate, including Δ17O, this study clarifies that the source of stream nitrate increase during storm events was soil nitrate in the riparian zone.
Nicolas Séon, Romain Amiot, Guillaume Suan, Christophe Lécuyer, François Fourel, Fabien Demaret, Arnauld Vinçon-Laugier, Sylvain Charbonnier, and Peggy Vincent
Biogeosciences, 19, 2671–2681, https://doi.org/10.5194/bg-19-2671-2022, https://doi.org/10.5194/bg-19-2671-2022, 2022
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We analysed the oxygen isotope composition of bones and teeth of four marine species possessing regional heterothermies. We observed a consistent link between oxygen isotope composition and temperature heterogeneities recorded by classical methods. This opens up new perspectives on the determination of the thermoregulatory strategies of extant marine vertebrates where conventional methods are difficult to apply, but also allows us to investigate thermophysiologies of extinct vertebrates.
Yuwei Liu, Guofeng Zhu, Zhuanxia Zhang, Zhigang Sun, Leilei Yong, Liyuan Sang, Lei Wang, and Kailiang Zhao
Biogeosciences, 19, 877–889, https://doi.org/10.5194/bg-19-877-2022, https://doi.org/10.5194/bg-19-877-2022, 2022
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We took the water cycle process of soil–plant–atmospheric precipitation as the research objective. In the water cycle of soil–plant–atmospheric precipitation, precipitation plays the main controlling role. The main source of replenishment for alpine meadow plants is precipitation and alpine meltwater; the main source of replenishment for forest plants is soil water; and the plants in the arid foothills mainly use groundwater.
Roberto Velázquez-Ochoa, María Julia Ochoa-Izaguirre, and Martín Federico Soto-Jiménez
Biogeosciences, 19, 1–27, https://doi.org/10.5194/bg-19-1-2022, https://doi.org/10.5194/bg-19-1-2022, 2022
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Our research is the first approximation to understand the δ13C macroalgal variability in one of the most diverse marine ecosystems in the world, the Gulf of California. The life-form is the principal cause of δ13C macroalgal variability, mainly taxonomy. However, changes in habitat characteristics and environmental conditions also influence the δ13C macroalgal variability. The δ13C macroalgae is indicative of carbon concentration mechanisms and isotope discrimination during carbon assimilation.
Raquel F. Flynn, Thomas G. Bornman, Jessica M. Burger, Shantelle Smith, Kurt A. M. Spence, and Sarah E. Fawcett
Biogeosciences, 18, 6031–6059, https://doi.org/10.5194/bg-18-6031-2021, https://doi.org/10.5194/bg-18-6031-2021, 2021
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Biological activity in the shallow Weddell Sea affects the biogeochemistry of recently formed deep waters. To investigate the drivers of carbon and nutrient export, we measured rates of primary production and nitrogen uptake, characterized the phytoplankton community, and estimated nutrient depletion ratios across the under-sampled western Weddell Sea in mid-summer. Carbon export was highest at the ice shelves and was determined by a combination of physical, chemical, and biological factors.
Stéphanie H. M. Jacquet, Christian Tamburini, Marc Garel, Aurélie Dufour, France Van Vambeke, Frédéric A. C. Le Moigne, Nagib Bhairy, and Sophie Guasco
Biogeosciences, 18, 5891–5902, https://doi.org/10.5194/bg-18-5891-2021, https://doi.org/10.5194/bg-18-5891-2021, 2021
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We compared carbon remineralization rates (MRs) in the western and central Mediterranean Sea in late spring during the PEACETIME cruise, as assessed using the barium tracer. We reported higher and deeper (up to 1000 m depth) MRs in the western basin, potentially sustained by an additional particle export event driven by deep convection. The central basin is the site of a mosaic of blooming and non-blooming water masses and showed lower MRs that were restricted to the upper mesopelagic layer.
Shinsuke Kawagucci, Yohei Matsui, Akiko Makabe, Tatsuhiro Fukuba, Yuji Onishi, Takuro Nunoura, and Taichi Yokokawa
Biogeosciences, 18, 5351–5362, https://doi.org/10.5194/bg-18-5351-2021, https://doi.org/10.5194/bg-18-5351-2021, 2021
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Hydrogen and carbon isotope ratios of methane as well as the relevant biogeochemical parameters and microbial community compositions in hydrothermal plumes in the Okinawa Trough were observed. We succeeded in simultaneously determining hydrogen and carbon isotope fractionation factors associated with aerobic oxidation of methane in seawater (εH = 49.4 ± 5.0 ‰, εC = 5.2 ± 0.4 ‰) – the former being the first of its kind ever reported.
Nicolai Schleinkofer, David Evans, Max Wisshak, Janina Vanessa Büscher, Jens Fiebig, André Freiwald, Sven Härter, Horst R. Marschall, Silke Voigt, and Jacek Raddatz
Biogeosciences, 18, 4733–4753, https://doi.org/10.5194/bg-18-4733-2021, https://doi.org/10.5194/bg-18-4733-2021, 2021
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We have measured the chemical composition of the carbonate shells of the parasitic foraminifera Hyrrokkin sarcophaga in order to test if it is influenced by the host organism (bivalve or coral). We find that both the chemical and isotopic composition is influenced by the host organism. For example strontium is enriched in foraminifera that grew on corals, whose skeleton is built from aragonite, which is naturally enriched in strontium compared to the bivalves' calcite shell.
Lena Rohe, Traute-Heidi Anderson, Heinz Flessa, Anette Goeske, Dominika Lewicka-Szczebak, Nicole Wrage-Mönnig, and Reinhard Well
Biogeosciences, 18, 4629–4650, https://doi.org/10.5194/bg-18-4629-2021, https://doi.org/10.5194/bg-18-4629-2021, 2021
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This is the first experimental setup combining a complex set of methods (microbial inhibitors and isotopic approaches) to differentiate between N2O produced by fungi or bacteria during denitrification in three soils. Quantifying the fungal fraction with inhibitors was not successful due to large amounts of uninhibited N2O production. All successful methods suggested a small or missing fungal contribution. Artefacts occurring with microbial inhibition to determine N2O fluxes are discussed.
Inga Köhler, Raul E. Martinez, David Piatka, Achim J. Herrmann, Arianna Gallo, Michelle M. Gehringer, and Johannes A. C. Barth
Biogeosciences, 18, 4535–4548, https://doi.org/10.5194/bg-18-4535-2021, https://doi.org/10.5194/bg-18-4535-2021, 2021
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We investigated how high Fe(II) levels influence the O2 budget of a circum-neutral Fe(II)-rich spring and if a combined study of dissolved O (DO) and its isotopic composition can help assess this effect. We showed that dissolved Fe(II) can exert strong effects on the δ18ODO even though a constant supply of atmospheric O2 occurs. In the presence of photosynthesis, direct effects of Fe oxidation become masked. Critical Fe(II) concentrations indirectly control the DO by enhancing photosynthesis.
Owen A. Sherwood, Samuel H. Davin, Nadine Lehmann, Carolyn Buchwald, Evan N. Edinger, Moritz F. Lehmann, and Markus Kienast
Biogeosciences, 18, 4491–4510, https://doi.org/10.5194/bg-18-4491-2021, https://doi.org/10.5194/bg-18-4491-2021, 2021
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Pacific water flowing eastward through the Canadian Arctic plays an important role in redistributing nutrients to the northwest Atlantic Ocean. Using samples collected from northern Baffin Bay to the southern Labrador Shelf, we show that stable isotopic ratios in seawater nitrate reflect the fraction of Pacific to Atlantic water. These results provide a new framework for interpreting patterns of nitrogen isotopic variability recorded in modern and archival organic materials in the region.
Franziska Slotta, Lukas Wacker, Frank Riedel, Karl-Uwe Heußner, Kai Hartmann, and Gerhard Helle
Biogeosciences, 18, 3539–3564, https://doi.org/10.5194/bg-18-3539-2021, https://doi.org/10.5194/bg-18-3539-2021, 2021
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The African baobab is a challenging climate and environmental archive for its semi-arid habitat due to dating uncertainties and parenchyma-rich wood anatomy. Annually resolved F14C data of tree-ring cellulose (1941–2005) from a tree in Oman show the annual character of the baobab’s growth rings but were up to 8.8 % lower than expected for 1964–1967. Subseasonal δ13C and δ18O patterns reveal years with low average monsoon rain as well as heavy rainfall events from pre-monsoonal cyclones.
Peter M. J. Douglas, Emerald Stratigopoulos, Sanga Park, and Dawson Phan
Biogeosciences, 18, 3505–3527, https://doi.org/10.5194/bg-18-3505-2021, https://doi.org/10.5194/bg-18-3505-2021, 2021
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Hydrogen isotopes could be a useful tool to help resolve the geographic distribution of methane emissions from freshwater environments. We analyzed an expanded global dataset of freshwater methane hydrogen isotope ratios and found significant geographic variation linked to water isotopic composition. This geographic variability could be used to resolve changing methane fluxes from freshwater environments and provide more accurate estimates of the relative balance of global methane sources.
Veronica R. Rollinson, Julie Granger, Sydney C. Clark, Mackenzie L. Blanusa, Claudia P. Koerting, Jamie M. P. Vaudrey, Lija A. Treibergs, Holly C. Westbrook, Catherine M. Matassa, Meredith G. Hastings, and Craig R. Tobias
Biogeosciences, 18, 3421–3444, https://doi.org/10.5194/bg-18-3421-2021, https://doi.org/10.5194/bg-18-3421-2021, 2021
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We measured nutrients and the naturally occurring nitrogen (N) and oxygen (O) stable isotope ratios of nitrate discharged from a New England river over an annual cycle, to monitor N loading and identify dominant sources from the watershed. We uncovered a seasonality to loading and sources of N from the watershed. Seasonality in the nitrate isotope ratios also informed on N cycling, conforming to theoretical expectations of riverine nutrient cycling.
Zixun Chen, Xuejun Liu, Xiaoqing Cui, Yaowen Han, Guoan Wang, and Jiazhu Li
Biogeosciences, 18, 2859–2870, https://doi.org/10.5194/bg-18-2859-2021, https://doi.org/10.5194/bg-18-2859-2021, 2021
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δ13C in plants is a sensitive long-term indicator of physiological acclimatization. The present study suggests that precipitation change and increasing atmospheric N deposition have little impact on δ13C of H. ammodendron, a dominant plant in central Asian deserts, but affect its gas exchange. In addition, this study shows that δ13C of H. ammodendron could not indicate its water use efficiency (WUE), suggesting that whether δ13C of C4 plants indicates WUE is species-specific.
Petra Zahajská, Carolina Olid, Johanna Stadmark, Sherilyn C. Fritz, Sophie Opfergelt, and Daniel J. Conley
Biogeosciences, 18, 2325–2345, https://doi.org/10.5194/bg-18-2325-2021, https://doi.org/10.5194/bg-18-2325-2021, 2021
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The drivers of high accumulation of single-cell siliceous algae (diatoms) in a high-latitude lake have not been fully characterized before. We studied silicon cycling of the lake through water, radon, silicon, and stable silicon isotope balances. Results showed that groundwater brings 3 times more water and dissolved silica than the stream inlet. We demonstrate that groundwater discharge and low sediment deposition have driven the high diatom accumulation in the studied lake in the past century.
Yu-Te Hsieh, Walter Geibert, E. Malcolm S. Woodward, Neil J. Wyatt, Maeve C. Lohan, Eric P. Achterberg, and Gideon M. Henderson
Biogeosciences, 18, 1645–1671, https://doi.org/10.5194/bg-18-1645-2021, https://doi.org/10.5194/bg-18-1645-2021, 2021
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The South Atlantic near 40° S is one of the high-productivity and most dynamic nutrient regions in the oceans, but the sources and fluxes of trace elements (TEs) to this region remain unclear. This study investigates seawater Ra-228 and provides important constraints on ocean mixing and dissolved TE fluxes to this region. Vertical mixing is a more important source than aeolian or shelf inputs in this region, but particulate or winter deep-mixing inputs may be required to balance the TE budgets.
Zhongjie Yu and Emily M. Elliott
Biogeosciences, 18, 805–829, https://doi.org/10.5194/bg-18-805-2021, https://doi.org/10.5194/bg-18-805-2021, 2021
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In this study, we demonstrated distinct nitrogen isotope effects for nitric oxide (NO) production from major microbial and chemical NO sources in an agricultural soil. These results highlight characteristic bond-forming and breaking mechanisms associated with microbial and chemical NO production and implicate that simultaneous isotopic analyses of NO and nitrous oxide (N2O) can lead to unprecedented insights into the sources and processes controlling NO and N2O emissions from agricultural soils.
Daniel A. Frick, Rainer Remus, Michael Sommer, Jürgen Augustin, Danuta Kaczorek, and Friedhelm von Blanckenburg
Biogeosciences, 17, 6475–6490, https://doi.org/10.5194/bg-17-6475-2020, https://doi.org/10.5194/bg-17-6475-2020, 2020
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Silicon is taken up by some plants to increase structural stability and to develop stress resistance and is rejected by others. To explore the underlying mechanisms, we used the stable isotopes of silicon that shift in their relative abundance depending on the biochemical transformation involved. On species with a rejective (tomato, mustard) and active (wheat) uptake mechanism, grown in hydroculture, we found that the transport of silicic acid is controlled by the precipitation of biogenic opal.
Quentin Charbonnier, Julien Bouchez, Jérôme Gaillardet, and Éric Gayer
Biogeosciences, 17, 5989–6015, https://doi.org/10.5194/bg-17-5989-2020, https://doi.org/10.5194/bg-17-5989-2020, 2020
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The abundance and isotope composition of the trace metal barium (Ba) allows us to track and quantify nutrient cycling throughout the Amazon Basin. In particular, we show that the Ba biological fingerprint evolves from that of a strong net nutrient uptake in the mountainous area of the Andes towards efficient nutrient recycling on the plains of the Lower Amazon. Our study highlights the fact that the geochemical signature of rock-derived nutrients transported by the Amazon is scarred by life.
Ajinkya G. Deshpande, Thomas W. Boutton, Ayumi Hyodo, Charles W. Lafon, and Georgianne W. Moore
Biogeosciences, 17, 5639–5653, https://doi.org/10.5194/bg-17-5639-2020, https://doi.org/10.5194/bg-17-5639-2020, 2020
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Wetland forests in the southern USA are threatened by changing climate and human-induced pressures. We used tree ring widths and C isotopes as indicators of forest growth and physiological stress, respectively, and compared these to past climate data. We observed that vegetation growing in the drier patches is susceptible to stress, while vegetation growth and physiology in wetter patches is less sensitive to unfavorable environmental conditions, highlighting the importance of optimal wetness.
Dominika Lewicka-Szczebak, Maciej Piotr Lewicki, and Reinhard Well
Biogeosciences, 17, 5513–5537, https://doi.org/10.5194/bg-17-5513-2020, https://doi.org/10.5194/bg-17-5513-2020, 2020
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We present the first validation of N2O isotopic approaches for estimating N2O source pathways and N2O reduction. These approaches are widely used for tracing soil nitrogen cycling, but the results of these estimations are very uncertain. Here we report the results from parallel treatments allowing for precise validation of these approaches, and we propose the best strategies for results interpretation, including the new idea of an isotope model integrating three isotopic signatures of N2O.
Markus Raitzsch, Claire Rollion-Bard, Ingo Horn, Grit Steinhoefel, Albert Benthien, Klaus-Uwe Richter, Matthieu Buisson, Pascale Louvat, and Jelle Bijma
Biogeosciences, 17, 5365–5375, https://doi.org/10.5194/bg-17-5365-2020, https://doi.org/10.5194/bg-17-5365-2020, 2020
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The isotopic composition of boron in carbonate shells of marine unicellular organisms is a popular tool to estimate seawater pH. Usually, many shells need to be dissolved and measured for boron isotopes, but the information on their spatial distribution is lost. Here, we investigate two techniques that allow for measuring boron isotopes within single shells and show that they yield robust mean values but provide additional information on the heterogeneity within and between single shells.
Florian Einsiedl, Anja Wunderlich, Mathieu Sebilo, Ömer K. Coskun, William D. Orsi, and Bernhard Mayer
Biogeosciences, 17, 5149–5161, https://doi.org/10.5194/bg-17-5149-2020, https://doi.org/10.5194/bg-17-5149-2020, 2020
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Nitrate pollution of freshwaters and methane emissions into the atmosphere are crucial factors in deteriorating the quality of drinking water and in contributing to global climate change. Here, we report vertical concentration and stable isotope profiles of CH4, NO3-, NO2-, and NH4+ in the water column of Fohnsee (southern Bavaria, Germany) that may indicate linkages between nitrate-dependent anaerobic methane oxidation and the anaerobic oxidation of ammonium.
Ruifang C. Xie, Frédéric A. C. Le Moigne, Insa Rapp, Jan Lüdke, Beat Gasser, Marcus Dengler, Volker Liebetrau, and Eric P. Achterberg
Biogeosciences, 17, 4919–4936, https://doi.org/10.5194/bg-17-4919-2020, https://doi.org/10.5194/bg-17-4919-2020, 2020
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Thorium-234 (234Th) is widely used to study carbon fluxes from the surface ocean to depth. But few studies stress the relevance of oceanic advection and diffusion on the downward 234Th fluxes in nearshore environments. Our study in offshore Peru showed strong temporal variations in both the importance of physical processes on 234Th flux estimates and the oceanic residence time of 234Th, whereas salinity-derived seawater 238U activities accounted for up to 40 % errors in 234Th flux estimates.
Ralf A. Oeser and Friedhelm von Blanckenburg
Biogeosciences, 17, 4883–4917, https://doi.org/10.5194/bg-17-4883-2020, https://doi.org/10.5194/bg-17-4883-2020, 2020
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We present a novel strategy to decipher the relative impact of biogenic and abiotic drivers of weathering. We parameterized the nutrient fluxes in four ecosystems along a climate and vegetation gradient situated on the Chilean Coastal Cordillera. We investigated how nutrient demand by plants drives weathering. We found that the increase in biomass nutrient demand is accommodated by faster nutrient recycling rather than an increase in the weathering–release rates.
Tito Arosio, Malin M. Ziehmer, Kurt Nicolussi, Christian Schlüchter, and Markus Leuenberger
Biogeosciences, 17, 4871–4882, https://doi.org/10.5194/bg-17-4871-2020, https://doi.org/10.5194/bg-17-4871-2020, 2020
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Stable isotopes in tree-ring cellulose are tools for climatic reconstructions, but interpretation is challenging due to nonclimate trends. We analyzed the tree-age trends in tree-ring isotopes of deciduous larch and evergreen cembran pine. Samples covering the whole Holocene were collected at the tree line in the Alps. For cambial ages over 100 years, we prove the absence of age trends in δD, δ18O, and δ13C for both species. For lower cambial ages, trends differ for each isotope and species.
Yuyang He, Xiaobin Cao, and Huiming Bao
Biogeosciences, 17, 4785–4795, https://doi.org/10.5194/bg-17-4785-2020, https://doi.org/10.5194/bg-17-4785-2020, 2020
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Different carbon sites in a large organic molecule have different isotope compositions. Different carbon sites may not have the chance to exchange isotopes at all. The lack of appreciation of this notion might be blamed for an unsettled debate on the thermodynamic state of an organism. Here we demonstrate using minerals, N2O, and acetic acid that the dearth of exchange among different carbon sites renders them as independent as if they were different elements in organic molecules.
Felix M. Spielmann, Albin Hammerle, Florian Kitz, Katharina Gerdel, and Georg Wohlfahrt
Biogeosciences, 17, 4281–4295, https://doi.org/10.5194/bg-17-4281-2020, https://doi.org/10.5194/bg-17-4281-2020, 2020
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Carbonyl sulfide (COS) can be used as a proxy for plant photosynthesis on an ecosystem scale. However, the relationships between COS and CO2 fluxes and their dependence on daily to seasonal changes in environmental drivers are still poorly understood. We examined COS and CO2 ecosystem fluxes above an agriculturally used mountain grassland for 6 months. Harvesting of the grassland disturbed the otherwise stable COS-to-CO2 uptake ratio. We even found the canopy to release COS during those times.
Getachew Agmuas Adnew, Thijs L. Pons, Gerbrand Koren, Wouter Peters, and Thomas Röckmann
Biogeosciences, 17, 3903–3922, https://doi.org/10.5194/bg-17-3903-2020, https://doi.org/10.5194/bg-17-3903-2020, 2020
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We measured the effect of photosynthesis, the largest flux in the carbon cycle, on the triple oxygen isotope composition of atmospheric CO2 at the leaf level during gas exchange using three plant species. The main factors that limit the impact of land vegetation on the triple oxygen isotope composition of atmospheric CO2 are identified, characterized and discussed. The effect of photosynthesis on the isotopic composition of CO2 is commonly quantified as discrimination (ΔA).
Moritz Schroll, Frank Keppler, Markus Greule, Christian Eckhardt, Holger Zorn, and Katharina Lenhart
Biogeosciences, 17, 3891–3901, https://doi.org/10.5194/bg-17-3891-2020, https://doi.org/10.5194/bg-17-3891-2020, 2020
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Fungi have recently been identified to produce the greenhouse gas methane. Here, we investigated the stable carbon isotope values of methane produced by saprotrophic fungi. Our results show that stable isotope values of methane from fungi are dependent on the fungal species and the metabolized substrate. They cover a broad range and overlap with stable carbon isotope values of methane reported for methanogenic archaea, the thermogenic degradation of organic matter, and other eukaryotes.
Pranav Hirave, Guido L. B. Wiesenberg, Axel Birkholz, and Christine Alewell
Biogeosciences, 17, 2169–2180, https://doi.org/10.5194/bg-17-2169-2020, https://doi.org/10.5194/bg-17-2169-2020, 2020
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Sediment input into water bodies is a prominent threat to freshwater ecosystems. We tested the stability of tracers employed in freshwater sediment tracing based on compound-specific isotope analysis during early degradation in soil. While bulk δ13C values showed no stability, δ13C values of plant-derived fatty acids and n-alkanes were stably transferred to the soil without soil particle size dependency after an early degradation in organic horizons, thus indicating their suitability as tracers.
Caroline Thaler, Amandine Katz, Magali Bonifacie, Bénédicte Ménez, and Magali Ader
Biogeosciences, 17, 1731–1744, https://doi.org/10.5194/bg-17-1731-2020, https://doi.org/10.5194/bg-17-1731-2020, 2020
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Paleoenvironment reconstructions, retrieved from δ18O and Δ47 values measured in carbonate, are compromised when crystallization occurs in isotopic disequilibrium. We show that some paleoenvironmental information can still be retrieved from these paired disequilibrium Δ47 and δ18O values. The possibility of retrieving information on paleowaters, sediments' interstitial waters, or organisms' body water at the carbonate precipitation loci will help understand past Earth and life evolution.
Guillaume Humbert, Mathieu Sébilo, Justine Fiat, Longqi Lang, Ahlem Filali, Véronique Vaury, Mathieu Spérandio, and Anniet M. Laverman
Biogeosciences, 17, 979–993, https://doi.org/10.5194/bg-17-979-2020, https://doi.org/10.5194/bg-17-979-2020, 2020
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Mitigating emissions of the greenhouse gas N2O requires understanding of the relative contribution of its producing processes in response to environmental variables. We show, using isotopic analysis, that N2O emissions from a nitrifying system were sensitive to oxygenation, temperature and NH4+ concentrations with nitrite reduction being the main N2O source. Temperature appears to be the main control on N2O production, due to its dissimilar effects on ammonium and nitrite oxidizing activities.
Oguz Yigiterhan, Ebrahim Mohd Al-Ansari, Alex Nelson, Mohamed Alaa Abdel-Moati, Jesse Turner, Hamood Abdulla Alsaadi, Barbara Paul, Ibrahim Abdullatif Al-Maslamani, Mehsin Abdulla Al-Ansi Al-Yafei, and James W. Murray
Biogeosciences, 17, 381–404, https://doi.org/10.5194/bg-17-381-2020, https://doi.org/10.5194/bg-17-381-2020, 2020
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We analyze net-tow samples of plankton and associated particulate matter from the Exclusive Economic Zone, Qatar, Arabian Gulf, using net tows with mesh sizes of 50 and 200 μm to examine the composition of plankton populations. We also focus on the role and composition of the atmospheric dust, representative of terrigenous material, deposited in the Gulf. We concluded that Al, Fe, Cr, Co, Mn, Ni, Pb, and Li are of dust origin and As, Cd, Cu, Mo, Zn, and Ca are of anthropogenic/biogenic origin.
Clare Woulds, James B. Bell, Adrian G. Glover, Steven Bouillon, and Louise S. Brown
Biogeosciences, 17, 1–12, https://doi.org/10.5194/bg-17-1-2020, https://doi.org/10.5194/bg-17-1-2020, 2020
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Sedimented hydrothermal vents occur where heated, mineral-rich (hydrothermal) water seeps through seafloor sediments. They host chemosynthetic microbes, which use chemical energy to fix dissolved carbon dioxide into sugars (chemosynthesis). We conducted carbon tracing experiments, and observed chemosynthesis at both vent and non-vent sites. Thus, chemosynthesis occurred over a much larger area than expected, suggesting it is more widespread than previously thought.
Cara C. Manning, Rachel H. R. Stanley, David P. Nicholson, Brice Loose, Ann Lovely, Peter Schlosser, and Bruce G. Hatcher
Biogeosciences, 16, 3351–3376, https://doi.org/10.5194/bg-16-3351-2019, https://doi.org/10.5194/bg-16-3351-2019, 2019
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We measured rates of biological activity and gas exchange in a Canadian estuary during ice melt. We quantified gas exchange using inert, deliberately released tracers and found that the gas transfer rate at > 90 % ice cover was 6 % of the rate for nearly ice-free conditions. We measured oxygen concentration and isotopic composition and used the data to detect changes in the rates of photosynthesis and respiration (autotrophy and heterotrophy) as the ice melted.
Marlène Lavrieux, Axel Birkholz, Katrin Meusburger, Guido L. B. Wiesenberg, Adrian Gilli, Christian Stamm, and Christine Alewell
Biogeosciences, 16, 2131–2146, https://doi.org/10.5194/bg-16-2131-2019, https://doi.org/10.5194/bg-16-2131-2019, 2019
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A fingerprinting approach using compound-specific stable isotopes was applied to a lake sediment core to reconstruct erosion processes over the past 150 years in a Swiss catchment. Even though the reconstruction of land use and eutrophication history was successful, the observation of comparatively low δ13C values of plant-derived fatty acids in the sediment suggests their alteration within the lake. Thus, their use as a tool for source attribution in sediment cores needs further investigation.
Luciana A. Pereira, Roberto V. Santos, Marília Hauser, Fabrice Duponchelle, Fernando Carvajal, Christophe Pecheyran, Sylvain Bérail, and Marc Pouilly
Biogeosciences, 16, 1781–1797, https://doi.org/10.5194/bg-16-1781-2019, https://doi.org/10.5194/bg-16-1781-2019, 2019
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This study presents the first step for a chemical origin certification of pirarucu fishery in the Amazon. A preliminary isotopic tool to improve the actual tracking system integrates ecological, social, and economic aspects of Amazon dynamics. The geographic origin validation of farmed and wild fishes contributes to environmental and social practices, secures food and income to communities, helps manage endangered species, reinforces aquaculture, and combats illegal fisheries.
Sarah Conrad, Johan Ingri, Johan Gelting, Fredrik Nordblad, Emma Engström, Ilia Rodushkin, Per S. Andersson, Don Porcelli, Örjan Gustafsson, Igor Semiletov, and Björn Öhlander
Biogeosciences, 16, 1305–1319, https://doi.org/10.5194/bg-16-1305-2019, https://doi.org/10.5194/bg-16-1305-2019, 2019
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Iron analysis of the particulate, colloidal, and truly dissolved fractions along the Lena River freshwater plume showed that the particulate iron dominates close to the coast. Over 99 % particulate and about 90 % colloidal iron were lost, while the truly dissolved phase was almost constant. Iron isotopes suggest that the shelf acts as a sink for particles and colloids with negative iron isotope values, while colloids with positive iron isotope values travel further out into the Arctic Ocean.
Cited articles
Adakudlu, M., Andersen, J., Bakke, J., Beldring, S., Benestad, R., Bilt, W.
V. D., and Wong, W. K.: Climate in Svalbard 2100 – a knowledge base for
climate adaptation. Norway, Norwegian Centre of Climate Services (NCCS) for
Norwegian Environment Agency (Miljødirektoratet), 208 pp., NCCS report, Norwegian Centre for Climate Services (NCCS) for Norwegian Environment Agency (Miljødirektoratet),
https://doi.org/10.25607/OBP-888, 2019.
Altabet, M. A. and Francois, R.: Nitrogen isotope biogeochemistry of the
Antarctic Polar Frontal Zone at 170∘ W, Deep-Sea Res. Pt. II, 48,
4247–4273, https://doi.org/10.1016/S0967-0645(01)00088-1, 2001.
Ansari, A. H., Hodson, A J, Heaton, T. H. E., Kaiser, J., and Marca-Bell, A.:
Stable isotopic evidence for nitrification and denitrification in a High
Arctic glacial ecosystem, Biogeochemistry, 113, 341–357, https://doi.org/10.1007/s10533-012-9761-9, 2013.
Arctic Climate Impact Assessment (ACIA).: Arctic Climate Impact Assessment,
1042 pp., Cambridge Univ. Press, Cambridge, UK, ISBN: 13 978-0-521-86509, 2005.
Beszczynska-Moller, A., Fahrbach, E., Schauer, U., and Hansen, E.:
Variability in Atlantic water temperature and transport at the entrance to
the Arctic Ocean, 19972010, ICES J. Mar. Sci., 69, 852–863,
https://doi.org/10.1093/ICESJMS/FSS056, 2012.
Björkman, M. P., Vega, C. P., Kühnel, R., Spataro, F., Ianniello,
A., Esposito, G., Kaiser, J., Marca, A., Hodson, A., Isaksson, E., and
Roberts, T. J.: Nitrate postdeposition processes in Svalbard surface snow,
J. Geophys. Res.-Atmos., 119, 12953–12976, https://doi.org/10.1002/2013JD021234,
2014.
Blais, M., Tremblay, J. -É., Jungblut, A. D., Gagnon, J., Martin, J.,
Thaler, M., and Lovejoy, C.: Nitrogen fixation and identification of
potential diazotrophs in the Canadian Arctic, Global Biogeochem. Cy., 26, GB3022,
https://doi.org/10.1029/2011GB004096, 2012.
Bokhorst, S., Huiskes, A., Convey, P., and Aerts, R.: External nutrient
inputs into terrestrial ecosystems of the Falkland Islands and the Maritime
Antarctic region, Polar Biol., 30, 1315–1321,
2007.
Brandes, J. A. and Devol, A. H.: A global marine-fixed nitrogen isotopic
budget: Implications for Holocene nitrogen cycling, Global Biogeochem.
Cy., 16, 67–1, https://doi.org/10.1029/2001GB001856, 2002.
Brzezinski, M. A.: The Si : C : N ratio of marine diatoms: interspecific
variability and the effect of some environmental variables1, J. Phycol.,
21, 347–357, https://doi.org/10.1111/J.0022-3646.1985.00347.X, 1985.
Buchwald, C., Santoro, A. E., Mcilvin, M. R., and Casciotti, K. L.: Oxygen
isotopic composition of nitrate and nitrite produced by nitrifying
cocultures and natural marine assemblages, Limnol. Oceanogr., 57, 1361–1375, https://doi.org/10.4319/lo.2012.57.5.1361,
2012.
Calleja, M. L. I., Kerherve, P., Bourgeois, S., Kedra, M., Leynaert, A.,
Devred, E., Babin, M., and Morata, N.: Effects of increase glacier discharge
on phytoplankton bloom dynamics and pelagic geochemistry in a high Arctic
fjord, Progr. Oceanogr., 159, 195–210, https://doi.org/10.1016/j.pocean.2017.07.005,
2017.
Cape, M. R., Straneo, F., Beaird, N., Bundy, R. M., and Charette, M. A.:
Nutrient release to oceans from buoyancy-driven upwelling at Greenland
tidewater glaciers, Nat. Geosci., 12, 34–39,
https://doi.org/10.1038/S41561-018-0268-4, 2019.
Carpenter, E. J., Harvey, H. R., Brian, F., and Capone, D. G.: Biogeochemical
tracers of the marine cyanobacterium Trichodesmium, Deep-Sea Res. Pt. I, 44, 27–38, https://doi.org/10.1016/S0967-0637(96)00091-X, 1997.
Carroll, D., Sutherland, D. A., Shroyer, E. L., Nash, J. D., Catania, G. A.,
and Stearns, L. A.: Modeling turbulent subglacial meltwater plumes:
Implications for fjord-scale buoyancy-driven circulation, J. Phys.
Oceanogr., 45, 2169–2185, https://doi.org/10.1175/JPO-D-15-0033.1, 2015.
Carroll, D., Sutherland, D. A., Hudson, B., Moon, T., Catania, G. A.,
Shroyer, E. L., Nash, J. D., Bartholomaus, T. C., Felikson, D., Stearns, L.
A., Noël, B. P. Y., and van den Broeke, M. R.: The impact of glacier
geometry on meltwater plume structure and submarine melt in Greenland
fjords, Geophys. Res. Lett., 43, 9739–9748, https://doi.org/10.1002/2016GL070170,
2016.
Casciotti, K. L. and Buchwald, C.: Insights on the marine microbial nitrogen
cycle from isotopic approaches to nitrification, Front. Microbiol., 3, p. 356,
https://doi.org/10.3389/FMICB.2012.00356, 2012.
Casciotti, K. L., Sigman, D. M., Hastings, M. G., Böhlke, J. K., and
Hilkert, A.: Measurement of the oxygen isotopic composition of nitrate in
seawater and freshwater using the denitrifier method, Anal. Chem., 74,
4905–4912, https://doi.org/10.1021/AC020113W, 2002.
Cokelet, E. D., Tervalon, N., and Bellingham, J. G.: Hydrography of the West
Spitsbergen Current, Svalbard Branch: Autumn, J. Geophys. Res, 113, 1006,
https://doi.org/10.1029/2007JC004150, 2008.
Cottier, F., Tverberg, V., Inall, M., Svendsen, H., Nilsen, F., and
Griffiths, C.: Water mass modification in an Arctic fjord through
cross-shelf exchange: The seasonal hydrography of Kongsfjorden, Svalbard, J.
Geophys. Res.-Ocean., 110, 1–18, https://doi.org/10.1029/2004JC002757, 2005.
Cottier, F. R., Nilsen, F., Enall, M. E., Gerland, S., Tverberg, V., and
Svendsen, H.: Wintertime warming of an Arctic shelf in response to
large-scale atmospheric circulation, Geophys. Res. Lett., 34,
https://doi.org/10.1029/2007GL029948, 2007.
Cottier, F. R., Nilsen, F., Skogseth, R., Tverberg, V., Skardhamar, J., and
Svendsen, H.: Arctic fjords: a review of the oceanographic environment and
dominant physical processes, Geol. Soc. Lond. Spec. Publ., 344, 35–50,
https://doi.org/10.1144/SP344.4, 2010.
Cowan, E. A.: Meltwater and tidal currents: Controls on circulation in a
small glacial fjord, Estuar. Coast. Shelf Sci., 34, 381–392,
https://doi.org/10.1016/S0272-7714(05)80077-0, 1992.
Cowton, T., Slater, D., Sole, A., Goldberg, D., and Nienow, P.: Modeling the
impact of glacial runoff on fjord circulation and submarine melt rate using
a new subgrid-scale parameterization for glacial plumes, J. Geophys. Res.-Ocean., 120, 796–812, https://doi.org/10.1002/2014JC010324, 2015.
Dähnke, K. and Thamdrup, B.: Nitrogen isotope dynamics and fractionation
during sedimentary denitrification in Boknis Eck, Baltic Sea,
Biogeosciences, 10, 3079–3088, https://doi.org/10.5194/bg-10-3079-2013, 2013.
D'Angelo, A., Giglio, F., Miserocchi, S., Sanchez-Vidal, A., Aliani, S.,
Tesi, T., Viola, A., Mazzola, M., and Langone, L.: Multi-year particle fluxes
in Kongsfjorden, Svalbard, Biogeosciences, 15, 5343–5363,
https://doi.org/10.5194/bg-15-5343-2018, 2018.
Darlington, E. F.: Meltwater delivery from the tidewater glacier Kronebreen
to Kongsfjorden, Svalbard; insights from in-situ and remote-sensing analyses
of sediment plumes, Doctoral dissertation, Loughborough University, https://hdl.handle.net/2134/19399 (last access: 20 December 2022), 2015.
David, T. D. and Krishnan, K. P.: Recent variability in the Atlantic water
intrusion and water masses in Kongsfjorden, an Arctic fjord, Polar Sci., 11,
30–41, https://doi.org/10.1016/J.POLAR.2016.11.004, 2017.
Debyser, M. C. F., Pichevin, L., Tuerena, R. E., Dodd, P. A., Doncila, A., and Ganeshram, R. S.: Tracing the role of Arctic shelf processes in Si and N cycling and export through the Fram Strait: Insights from combined silicon and nitrate isotopes, Biogeosciences, 19, 5499–5520, https://doi.org/10.5194/bg-19-5499-2022, 2022.
De Rovere, F., Langone, L., Schroeder, K., Miserocchi, S., Giglio, F.,
Aliani, S., and Chiggiato, J.: Water masses variability in inner Kongsfjorden
(Svalbard) during 2010–2020, Front. Mar. Sci., 9,
https://doi.org/10.3389/fmars.2022.741075, 2022.
DiFiore, P. J., Sigman, D. M., and Dunbar, R. B.: Upper ocean nitrogen fluxes
in the Polar Antarctic Zone: Constraints from the nitrogen and oxygen
isotopes of nitrate, Geochem. Geophy. Geosy., 10, Q11016,
https://doi.org/10.1029/2009GC002468, 2009.
Dugdale, R. C. and Wilkerson, F. P.: Sources and fates of silicon in the
ocean: The role of diatoms in the climate and glacial cycles, Sci. Mar.,
65, 141–152, https://doi.org/10.3989/SCIMAR.2001.65S2141, 2001.
Dugdale, R. C., Wilkerson, F. P., and Minas, H. J.: The role of a silicate
pump in driving new production, Deep-Sea Res. Pt. I,
42, 697–719, https://doi.org/10.1016/0967-0637(95)00015-X, 1995.
Dürr, H. H., Laruelle, G. G., van Kempen, C. M., Slomp, C. P., Meybeck,
M., and Middelkoop, H.: Worldwide Typology of nearshore coastal systems:
Defining the estuarine filter of river inputs to the Oceans, Estuar. Coast.,
34, 441–458, https://doi.org/10.1007/S12237-011-9381-Y/TABLES/5, 2011.
Egge, J. K.: Are diatoms poor competitors at low phosphate concentrations?,
J. Mar. Syst., 16, 191–198, https://doi.org/10.1016/S0924-7963(97)00113-9, 1998.
Elverhøi, A., Lønne, Ø., and Seland, R..: Glaciomarine
sedimentation in a modern fjord environment, Spitsbergen, Polar Res., 1,
127–149, https://doi.org/10.3402/POLAR.V1I2.6978, 1983.
Eriksen, E., Gjøsæter, H., Prozorkevich, D., Shamray, E., Dolgov, A.,
Skern-Mauritzen, M., Stiansen, J. E., Kovalev, Y., and Sunnanå, K.: From
single species surveys towards monitoring of the Barents Sea ecosystem,
Prog. Oceanogr., 166, 4–14, https://doi.org/10.1016/J.POCEAN.2017.09.007, 2018.
Everett, A., Kohler, J., Sundfjord, A., Kovacs, K. M., Torsvik, T.,
Pramanik, A., Boehme, L., and Lydersen, C.: Subglacial discharge plume
behaviour revealed by CTD-instrumented ringed seals, Sci. Rep., 8, 13467,
https://doi.org/10.1038/s41598-018-31875-8, 2018
Geyer, W. R. and Ralston, D. K.: The dynamics of strongly stratified
estuaries, Treat. Estuar. Coast. Sci., 2, 37–51,
https://doi.org/10.1016/B978-0-12-374711-2.00206-0, 2011.
Granger, J., Sigman, D. M., Gagnon, J., Tremblay, J. E., and Mucci, A.: On
the properties of the Arctic halocline and deep water masses of the Canada
Basin from nitrate isotope ratios, J. Geophys. Res.-Ocean., 123,
5443–5458, https://doi.org/10.1029/2018JC014110, 2018.
Gruber, N. and Sarmiento, J. L.: Global patterns of marine nitrogen fixation
and denitrification, Global Biogeochem. Cy., 11, 235–266, https://doi.org/10.1029/97GB00077, 1997.
Halbach, L., Vihtakari, M., Duarte, P., Everett, A., Granskog, M. A., Hop,
H., Kauko, H. M., Kristiansen, S., Myhre, P. I., Pavlov, A. K., Pramanik,
A., Tatarek, A., Torsvik, T., Wiktor, J. M., Wold, A., Wulff, A., Steen, H.,
and Assmy, P.: Tidewater glaciers and bedrock characteristics control the
phytoplankton growth environment in a fjord in the Arctic, Front. Mar. Sci.,
6, p. 254, https://doi.org/10.3389/FMARS.2019.00254/BIBTEX, 2019.
Hawkings, J. R., Wadham, J. L., Tranter, M., Lawson, E., Sole, A., Cowton,
T., Tedstone, A. J., Bartholomew, I., Nienow, P., Chandler, D., and Telling,
J.: The effect of warming climate on nutrient and solute export from the
Greenland Ice Sheet, Geochem. Perspect. Lett., 1, 94–104,
https://doi.org/10.7185/GEOCHEMLET.1510, 2015.
Hayashi, K., Tanabe, Y., Ono, K., Loonen, M. J. J. E., Asano, M., Fujitani,
H., Tokida, T., Uchida, M., and Hayatsu, M.: Seabird-affected taluses are
denitrification hotspots and potential N2O emitters in the High Arctic,
Sci. Rep., 8, 1–11, https://doi.org/10.1038/s41598-018-35669-w, 2018.
Heaton, T. H. E., Wynn, P., and Tye, A. M.: Low 15N
Hegseth, E. N., Assmy, P., Wiktor, J. M., Wiktor, J., Kristiansen, S., Leu,
E., Tverberg, V., Gabrielsen, T. M., Skogseth, R., and Cottier, F.:
Phytoplankton seasonal dynamics in Kongsfjorden, Svalbard and the adjacent shelf, in: The Ecosystem of Kongsfjorden, Svalbard, eds Haakon Hop and Christian Wiencke, Cham, Springer, 173–227, https://doi.org/10.1007/978-3-319-46425-1_6,
Chap. 3 – Pelagic Production, Phytoplankton and Zooplankton,
2019.
Hodal, H., Falk-Petersen, S., Hop, H., Kristiansen, S., and Reigstad, M.:
Spring bloom dynamics in Kongsfjorden, Svalbard: Nutrients, phytoplankton,
protozoans and primary production, Polar Biol., 35, 191–203,
2012.
Hodson, A. J., Mumford, P. N., Kohler, J., and Wynn, P. M.: The High Arctic
glacial ecosystem: new insights from nutrient budgets, Biogeochemistry,
72, 233–256, https://doi.org/10.1007/S10533-004-0362-0, 2005.
Holmes, R. M., McClelland, J. W., Peterson, B. J., Tank, S. E., Bulygina,
E., Eglinton, T. I., Gordeev, V. V., Gurtovaya, T. Y., Raymond, P. A.,
Repeta, D. J., Staples, R., Striegl, R. G., Zhulidov, A. V., and Zimov, S.
A.: Seasonal and annual fluxes of nutrients and organic matter from large
rivers to the Arctic Ocean and surrounding seas, Estuar. Coast.,
35, 369–382, 2012.
Hop, H. and Wiencke, C.: Editorial: The ecosystem of Kongsfjorden, Svalbard.
Advances in Polar Ecology 2, Springer, Cham,
https://doi.org/10.1007/978-3-319-46425-1_1, 2019
Hop, H., Assmy, P., Wold, A., Sundfjord, A., Daase, M., Duarte, P.,
Kwasniewski, S., Gluchowska, M., Wiktor, J. M., Tatarek, A., Wiktor, J.,
Kristiansen, S., Fransson, A., Chierici, M., and Vihtakari, M.: Pelagic
ecosystem characteristics across the Atlantic Water Boundary Current from
Rijpfjorden, Svalbard, to the Arctic ocean during summer (2010–2014), Front.
Mar. Sci., 6, 181, https://doi.org/10.3389/fmars.2019.00181, 2019.
Hopwood, M. J., Carroll, D., Dunse, T., Hodson, A., Holding, J. M., Iriarte,
J. L., Ribeiro, S., Achterberg, E. P., Cantoni, C., Carlson, D. F.,
Chierici, M., Clarke, J. S., Cozzi, S., Fransson, A., Juul-Pedersen, T.,
Winding, M. H. S., and Meire, L.: Review article: How does glacier discharge
affect marine biogeochemistry and primary production in the Arctic?,
The Cryosphere, 14, 1347–1383, https://doi.org/10.5194/tc-14-1347-2020, 2020.
How, P., Benn, D. I., Hulton, N. R. J., Hubbard, B., Luckman, A., Sevestre,
H., Pelt, W. J. J. V., Lindbäck, K., Kohler, J., and Boot, W.: Rapidly
changing subglacial hydrological pathways at a tidewater glacier revealed
through simultaneous observations of water pressure, supraglacial lakes,
meltwater plumes and surface velocities, The Cryosphere, 11, 2691–2710,
https://doi.org/10.5194/tc-11-2691-2017, 2017.
Howe, J. A., Harland, R., Cottier, F. R., Brand, T., Willis, K. J., Berge,
J. R., Grøsfjeld, K., and Eriksson, A.: Dinoflagellate cysts as proxies
for palaeoceanographic conditions in Arctic fjords, Geol. Soc. Spec. Publ.,
344, 61–74, https://doi.org/10.1144/SP344.6, 2010.
Ilicak, M., Drange, H., Wang, Q., Gerdes, R., Aksenov, Y., Bailey, D.,
Bentsen, M., Biastoch, A., Bozec, A., Böning, C., Cassou, C.,
Chassignet, E., Coward, A. C., Curry, B., Danabasoglu, G., Danilov, S.,
Fernandez, E., Fogli, P. G., Fujii, Y., Griffies, S. M., Iovino, D., Jahn,
A., Jung, T., Large, W. G., Lee, C., Lique, C., Lu, J., Masina, S., George
Nurser, A. J., Roth, C., Salas y Mélia, D., Samuels, B. L., Spence, P.,
Tsujino, H., Valcke, S., Voldoire, A., Wang, X., and Yeager, S. G.: An
assessment of the Arctic Ocean in a suite of interannual CORE-II
simulations. Part III: Hydrography and fluxes, Ocean Model., 100, 141–161,
https://doi.org/10.1016/J.OCEMOD.2016.02.004, 2016.
Ingvaldsen, R., Reitan, M. B., Svendsen, H., and Asplin, L.: The upper layer
circulation in Kongsfjorden and Krossfjorden – A complex fjord system on the
west coast of Spitsbergen (scientific paper), Memoirs of National Institute of Polar Research, Special Issue, 54, 393–407, 2001.
Jakobsson, M., Mayer, L., Coakley, B., Dowdeswell, J. A., Forbes, S.,
Fridman, B., Hodnesdal, H., Noormets, R., Pedersen, R., Rebesco, M.,
Schenke, H. W., Zarayskaya, Y., Accettella, D., Armstrong, A., Anderson, R.
M., Bienhoff, P., Camerlenghi, A., Church, I., Edwards, M., Gardner, J. V.,
Hall, J. K., Hell, B., Hestvik, O., Kristoffersen, Y., Marcussen, C.,
Mohammad, R., Mosher, D., Nghiem, S. V., Pedrosa, M. T., Travaglini, P. G.,
and Weatherall, P.: The International Bathymetric Chart of the Arctic Ocean
(IBCAO) Version 3.0, Geophys. Res. Lett., 39, 12609,
https://doi.org/10.1029/2012GL052219, 2012.
Kanna, N., Sugiyama, S., Ohashi, Y., Sakakibara, D., Fukamachi, Y., and
Nomura, D.: Upwelling of macronutrients and dissolved inorganic carbon by a
subglacial freshwater driven plume in Bowdoin Fjord, Northwestern Greenland,
J. Geophys. Res.-Biogeo., 123, 1666–1682,
https://doi.org/10.1029/2017JG004248, 2018.
Kehrl, L. M., Hawley, R. L., Powell, R. D., and Brigham-Grette, J.:
Glacimarine sedimentation processes at Kronebreen and Kongsvegen, Svalbard,
J. Glaciol., 57, 841–847, https://doi.org/10.3189/002214311798043708, 2011.
Kendall, C.: Tracing nitrogen sources and cycling in catchments, Isot.
Tracers Catchment Hydrol., chap. 16 – Tracing Nitrogen Sources and Cycling, in: Catchments, edited by: Kendall, C. and Mcdonnell, J. J.,
Isotope Tracers in Catchment Hydrology,
Elsevier, ISBN: 9780444815460,
519–576, https://doi.org/10.1016/B978-0-444-81546-0.50023-9,
1998.
Kohler, J., James, T. D., Murray, T., Nuth, C., Brandt, O., Barrand, N. E.,
Aas, H. F., and Luckman, A.: Acceleration in thinning rate on western
Svalbard glaciers, Geophys. Res. Lett., 34, 18, https://doi.org/10.1029/2007GL030681,
2007.
Krause, J. W., Duarte, C. M., Marquez, I. A., Assmy, P.,
Fernández-Méndez, M., Wiedmann, I., Wassmann, P., Kristiansen, S.,
and Agustí, S.: Biogenic silica production and diatom dynamics in the
Svalbard region during spring, Biogeosciences, 15, 6503–6517,
https://doi.org/10.5194/bg-15-6503-2018, 2018.
Krause, J. W., Schulz, I. K., Rowe, K. A., Dobbins, W., Winding, M. H. S.,
Sejr, M. K., Duarte, C. M., and Agustí, S.: Silicic acid limitation
drives bloom termination and potential carbon sequestration in an Arctic
bloom, Sci. Rep., 9, 1–11, https://doi.org/10.1038/s41598-019-44587-4,
2019.
Krisch, S., Browning, T. J., Graeve, M., Ludwichowski, K.-U., Lodeiro, P.,
Hopwood, M. J., Roig, S., Yong, J.-C., Kanzow, T., and Achterberg, E. P.: The
influence of Arctic Fe and Atlantic fixed N on summertime primary production
in Fram Strait, North Greenland Sea, Sci. Rep., 10, 15230, https://doi.org/10.1038/s41598-020-72100-9, 2020.
Kulk, G., van de Poll, W. H., and Buma, A. G. J.: Photophysiology of nitrate
limited phytoplankton communities in Kongsfjorden, Spitsbergen, Limnol.
Oceanogr., 63, 2606–2617, https://doi.org/10.1002/LNO.10963, 2018.
Kumar, V., Tiwari, M., and Rengarajan, R.: Warming in the Arctic captured by
productivity variability at an Arctic fjord over the past two centuries,
PLoS One, 13, e0201456, https://doi.org/10.1371/JOURNAL.PONE.0201456, 2018.
Leifer, I., Chen, F. R., McClimans, T., Muller Karger, F., and Yurganov, L.: Satellite ice extent, sea surface temperature, and atmospheric methane trends in the Barents and Kara seas, The Cryosphere Discuss. [preprint], https://doi.org/10.5194/tc-2018-75, in review, 2018.
Li, W. K. W., McLaughlin, F. A., Lovejoy, C., and Carmack, E. C.: Smallest
algae thrive as the Arctic Ocean freshens, Science, 326, p. 539,
https://doi.org/10.1126/science.1179798/suppl_file/li.som.pdf, 2009.
McGovern, M., Pavlov, A. K., Deininger, A., Granskog, M. A., Leu, E.,
Søreide, J. E., and Poste, A. E.: Terrestrial inputs drive seasonality in
organic matter and nutrient biogeochemistry in a high Arctic fjord system
(Isfjorden, Svalbard), Front. Mar. Sci., 7, 542563,
https://doi.org/10.3389/FMARS.2020.542563/BIBTEX, 2020.
McIlvin, M. R. and Casciotti, K. L.: Technical updates to the bacterial
method for nitrate isotopic analyses, Anal. Chem., 83, 1850–1856,
https://doi.org/10.1021/AC1028984, 2011.
Meire, L., Mortensen, J., Meire, P., Juul-Pedersen, T., Sejr, M. K.,
Rysgaard, S., Nygaard, R., Huybrechts, P., and Meysman, F. J. R.:
Marine-terminating glaciers sustain high productivity in Greenland fjords,
Glob. Change Biol., 23, 5344–5357, https://doi.org/10.1111/GCB.13801, 2017.
Meslard, F., Bourrin, F., Many, G., and Kerhervé, P.: Suspended particle
dynamics and fluxes in an Arctic fjord (Kongsfjorden, Svalbard), Estuar.
Coast. Shelf Sci., 204, 212–224, https://doi.org/10.1016/J.ECSS.2018.02.020, 2018.
Monteban, D., Pedersen, J. O. P., and Nielsen, M. H.: Physical oceanographic
conditions and a sensitivity study on meltwater runoff in a West Greenland
fjord: Kangerlussuaq, Oceanologia, 62, 460–477,
https://doi.org/10.1016/J.OCEANO.2020.06.001, 2020.
Morlighem, M., Williams, C. N., Rignot, E., An, L., Arndt, J. E., Bamber, J.
L., Catania, G., Chauché, N., Dowdeswell, J. A., Dorschel, B., Fenty,
I., Hogan, K., Howat, I., Hubbard, A., Jakobsson, M., Jordan, T. M.,
Kjeldsen, K. K., Millan, R., Mayer, L., Mouginot, J., Noël, B. P. Y.,
O'Cofaigh, C., Palmer, S., Rysgaard, S., Seroussi, H., Siegert, M. J.,
Slabon, P., Straneo, F., van den Broeke, M. R., Weinrebe, W., Wood, M., and
Zinglersen, K. B.: BedMachine v3: Complete bed topography and ocean
bathymetry mapping of Greenland from multibeam echo sounding combined with
mass conservation, Geophys. Res. Lett., 44, 11051–11061,
https://doi.org/10.1002/2017GL074954, 2017.
Nuth, C., Kohler, J., König, M., von Deschwanden, A., Hagen, J. O., Kääb, A., Moholdt, G., and Pettersson, R.: Decadal changes from a multi-temporal glacier inventory of Svalbard, The Cryosphere, 7, 1603–1621, https://doi.org/10.5194/tc-7-1603-2013, 2013.
Onarheim, I. H., Smedsrud, L. H., Ingvaldsen, R. B., and Nilsen, F.: Loss of
sea ice during winter north of Svalbard, Dynam. Meteorol.
Oceanogr., 66, 23933, https://doi.org/10.3402/TELLUSA.V66.23933, 2014.
Østby, T. I., Vikhamar Schuler, T., Ove Hagen, J., Hock, R., Kohler, J.,
and Reijmer, C. H.: Diagnosing the decline in climatic mass balance of
glaciers in Svalbard over 1957–2014, The Cryosphere, 11, 191–215,
https://doi.org/10.5194/tc-11-191-2017, 2017.
Payne, C. M. and Roesler, C. S.: Characterizing the influence of Atlantic
water intrusion on water mass formation and phytoplankton distribution in
Kongsfjorden, Svalbard, Cont. Shelf Res., 191, 104005,
https://doi.org/10.1016/J.CSR.2019.104005, 2019.
Pérez-Hernández, M. D., Pickart, R. S., Pavlov, V., Våge, K.,
Ingvaldsen, R., Sundfjord, A., Renner, A. H. H., Torres, D. J., and Erofeeva,
S. Y.: The Atlantic Water boundary current north of Svalbard in late summer,
J. Geophys. Res.-Ocean., 122, 2269–2290, https://doi.org/10.1002/2016JC012486, 2017.
Piquet, A. M. T., van de Poll, W. H., Visser, R. J. W., Wiencke, C.,
Bolhuis, H., and Buma, A. G. J.: Springtime phytoplankton dynamics in Arctic
Krossfjorden and Kongsfjorden (Spitsbergen) as a function of glacier
proximity, Biogeosciences, 11, 2263–2279, https://doi.org/10.5194/bg-11-2263-2014,
2014.
Piwosz, K., Spich, K., Calkiewicz, J., Weydmann, A., Kubiszyn, A. M., and
Wiktor, J. M.: Distribution of small phytoflagellates along an Arctic fjord
transect, Environ. Microbiol., 17, 2393–2406,
https://doi.org/10.1111/1462-2920.12705, 2015.
Pohjola, V. A., Moore, J. C., Isaksson, E., Jauhiainen, T., van de Wal, R.
S. W., Martma, T., Meijer, H. A. J., Vaikmäe, R., Pohjola, V. A., Moore,
J. C., Isaksson, E., Jauhiainen, T., van de Wal, R. S. W., Martma, T.,
Meijer, H. A. J., and Vaikmäe, R.: Effect of periodic melting on
geochemical and isotopic signals in an ice core from Lomonosovfonna,
Svalbard, J. Geophys. Res.-Atmos., 107, ACL 1-1–ACL 1-14, https://doi.org/10.1029/2000JD000149, 2002.
Polyakov, I. V., Pnyushkov, A. V., Alkire, M. B., Ashik, I. M., Baumann, T.
M., Carmack, E. C., Goszczko, I., Guthrie, J., Ivanov, V. V., Kanzow, T.,
Krishfield, R., Kwok, R., Sundfjord, A., Morison, J., Rember, R., and Yulin,
A.: Greater role for Atlantic inflows on sea-ice loss in the Eurasian Basin
of the Arctic Ocean, Science, 356, 285–291, 2017.
Randelhoff, A., Reigstad, M., Chierici, M., Sundfjord, A., Ivanov, V., Cape,
M., Vernet, M., Tremblay, J.-É, Bratbak, G., and Kristiansen, S.:
Seasonality of the physical and biogeochemical hydrography in the inflow to
the Arctic Ocean through Fram Strait, Front. Mar. Sci., 5, p. 224, https://doi.org/10.3389/fmars.2018.00224, 2018
Renner, A. H. H., Sundfjord, A., Janout, M. A., Ingvaldsen, R. B.,
Beszczynska-Möller, A., Pickart, R. S., and Pérez-Hernández, M.
D.: Variability and redistribution of heat in the Atlantic Water Boundary
Current north of Svalbard, J. Geophys. Res.-Ocean., 123, 6373–6391,
https://doi.org/10.1029/2018JC013814, 2018.
Rokkan Iversen, K. and Seuthe, L.: Seasonal microbial processes in a
high-latitude fjord (Kongsfjorden, Svalbard): I. Heterotrophic bacteria,
picoplankton and nanoflagellates, Polar Biol., 34, 731–749,
https://doi.org/10.1007/S00300-010-0929-2/TABLES/6, 2011.
Rudels, B.: The formation of polar surface water, the ice export and the
exchanges through the Fram Strait, Prog. Oceanogr., 22, 205–248,
https://doi.org/10.1016/0079-6611(89)90013-X, 1989.
Rudels, B., Björk, G., Nilsson, J., Winsor, P., Lake, I., and Nohr, C.:
The interaction between waters from the Arctic Ocean and the Nordic Seas
north of Fram Strait and along the East Greenland Current: results from the
Arctic Ocean-02 Oden expedition, J. Mar. Syst., 1–2, 1–30,
https://doi.org/10.1016/J.JMARSYS.2004.06.008, 2005.
Ryabenko, E.: Stable Isotope Methods for the Study of the Nitrogen Cycle,
in: Topics in Oceanography, edited by: Zambianchi, E., London, IntechOpen, 1–40, https://doi.org/10.5772/56105, 2013.
Sarmiento, J. L., Gruber, N., Brzezinski, M. A., and Dunne, J. P.:
High-latitude controls of thermocline nutrients and low latitude biological
productivity, Nature, 427, 56–60, https://doi.org/10.1038/nature02204.1.,
2004.
Schild, K. M., Hawley, R. L., Chipman, J. W., and Benn, D. I.: Quantifying
suspended sediment concentration in subglacial sediment plumes discharging
from two Svalbard tidewater glaciers using Landsat-8 and in situ
measurements, Int. J. Rem. Sens. 38, 6865–6881,
https://doi.org/10.1080/01431161.2017.1365388, 2017.
Shi, F., Shi, X., Su, X., Fang, X., Wu, Y., Cheng, Z., and Yao, Z.: Clay
minerals in Arctic Kongsfjorden surface sediments and their implications on
provenance and paleoenvironmental change, Acta Oceanol. Sin. 37, 29–38,
https://doi.org/10.1007/S13131-018-1220-6, 2018.
Sigman, D. M. and Casciotti, K. L.: Nitrogen Isotopes in the Ocean,
Encycl. Ocean Sci., 1884–1894, Elsevier,
https://doi.org/10.1006/rwos.2001.0172, 2001.
Sigman, D. M. and Fripiat, F.: Nitrogen isotopes in the ocean, Encycl. Ocean
Sci., 3, 263–278, https://doi.org/10.1016/B978-0-12-409548-9.11605-7, 2019.
Sigman, D. M., Casciotti, K. L., Andreani, M., Barford, C., Galanter, M., and
Böhlke, J. K.: A Bacterial method for the nitrogen isotopic analysis of
nitrate in seawater and freshwater, Anal. Chem., 73, 4145–4153,
https://doi.org/10.1021/AC010088E, 2001.
Sigman, D. M., Granger, J., DiFiore, P. J., Lehmann, M. M., Ho, R., Cane, G.,
and van Geen, A.: Coupled nitrogen and oxygen isotope measurements of
nitrate along the eastern North Pacific margin, Global Biogeochem. Cy.,
19, 4, https://doi.org/10.1029/2005GB002458, 2005.
Sigman, D. M., DiFiore, P. J., Hain, M. P., Deutsch, C., and Karl, D. M.:
Sinking organic matter spreads the nitrogen isotope signal of pelagic
denitrification in the North Pacific, Geophys. Res. Lett., 36, 8,
https://doi.org/10.1029/2008GL035784, 2009a.
Sigman, D. M., DiFiore, P. J., Hain, M. P., Deutsch, C., Wang, Y., Karl, D.
M., Knapp, A. N., Lehmann, M. F., and Pantoja, S.: The dual isotopes of deep
nitrate as a constraint on the cycle and budget of oceanic fixed nitrogen,
Deep-Sea Res. Pt. I, 56, 1419–1439,
https://doi.org/10.1016/J.DSR.2009.04.007, 2009b.
Skogseth, R., Olivier, L. L. A., Nilsen, F., Flack, E., Fraser, N.,
Tverberg, V., Ledang, A. B., Vader, A., Jonassen, M. O., Søreide, J.,
Cottier, F., Berge, J., Ivanov, B. V., and Falk-Petersen, S.: Variability and
decadal trends in the Isfjorden (Svalbard) ocean climate and circulation –
An indicator for climate change in the European Arctic, Progr. Oceanogr.,
187, 102394, https://doi.org/10.1016/j.pocean.2020.102394, 2020.
Skrzypek, G., Wojtuń, B., Richter, D., Jakubas, D., Wojczulanis-Jakubas,
K., and Samecka-Cymerman, A.: Diversification of nitrogen sources in various
tundra vegetation types in the High Arctic, PLoS One, 10, e0136536,
https://doi.org/10.1371/journal.pone.0136536, 2015.
Slater, D. A., Straneo, F., Felikson, D., Little, C. M., Goelzer, H.,
Fettweis, X., and Holte, J.: Estimating Greenland tidewater glacier retreat
driven by submarine melting, The Cryosphere, 13, 2489–2509,
https://doi.org/10.5194/tc-13-2489-2019, 2019.
Smart, S. M., Fawcett, S. E., Thomalla, S. J., Weigand, M. A., Reason, C. J.
C., and Sigman, D. M.: Isotopic evidence for nitrification in the Antarctic
winter mixed layer, Global Biogeochem. Cy., 29, 427–445,
https://doi.org/10.1002/2014GB005013, 2015.
Smith, W. H. F. and Sandwell, D. T.: Global sea floor topography from
satellite altimetry and ship depth soundings, Science, 277,
1956–1962, https://doi.org/10.1126/SCIENCE.277.5334.1956, 1997.
Straneo, F. and Cenedese, C.: The Dynamics of Greenland's glacial fjords and
their role in climate, Ann. Rev. Mar. Sci., 7, 89–112,
https://doi.org/10.1146/ANNUREV-MARINE-010213-135133, 2015.
Straneo, F., Hamilton, G. S., Sutherland, D. A., Stearns, L. A., Davidson,
F., Hammill, M. O., Stenson, G. B., and Rosing-Asvid, A.: Rapid circulation
of warm subtropical waters in a major glacial fjord in East Greenland, Nat.
Geosci., 3, 182–186, https://doi.org/10.1038/NGEO764, 2010.
Strøm, H., Descamps, S., and Bakken, V.: Seabird Colonies by the Barents
Sea, White Sea and Kara Sea, Norwegian Polar Institute, Tromsø, Norway [data set], https://doi.org/10.21334/npolar.2008.fd4fd3aa, 2008.
Strom, S. L., Olson, M. B., Macri, E. L., and Mordy, C. W.: Cross-shelf
gradients in phytoplankton community structure, nutrient utilization, and
growth rate in the coastal Gulf of Alaska, Mar. Ecol. Prog. Ser., 328,
75–92, https://doi.org/10.3354/MEPS328075, 2006.
Svendsen, H., Beszczynska-Møller, A., Hagen, J. O., Lefauconnier, B.,
Tverberg, V., Gerland, S., Ørbæk, J. B., Bischof, K., Papucci, C.,
Zajaczkowski, M., Azzolini, R., Bruland, O., Wiencke, C., Winther, J.-G.,
and Dallmann, W.: The physical environment of Kongsfjorden–Krossfjorden, an
Arctic fjord system in Svalbard, Polar Res., 21, 133–166,
https://doi.org/10.1111/J.1751-8369.2002.TB00072.X, 2002.
Szpak, P., Longstaffe, F. J., Millaire, J. F., and White, C. D.: Stable
isotope biogeochemistry of seabird guano fertilization: results from growth
chamber studies with maize (Zea mays), PLoS One, 7, e33741,
https://doi.org/10.1371/JOURNAL.PONE.0033741, 2012.
Telling, J., Anesio, A. M., Tranter, M., Irvine-Fynn, T., Hodson, A.,
Butler, C., and Wadham, J.: Nitrogen fixation on Arctic glaciers, Svalbard,
J. Geophys. Res.-Biogeo., 116, G3, https://doi.org/10.1029/2010JG001632, 2011.
Terhaar, J., Lauerwald, R., Regnier, P., Gruber, N., and Bopp, L.: Around one
third of current Arctic Ocean primary production sustained by rivers and
coastal erosion, Nat. Commun., 12, 1–10, https://doi.org/10.1038/s41467-020-20470-z, 2021.
Tiwari, M., Nagoji, S., Kumar, V., Tripathi, S., and Behera, P.: Oxygen
isotope-salinity relation in an Arctic fjord (Kongsfjorden): Implications to
hydrographic variability, Geosci. Front., 9, 1937–1943,
https://doi.org/10.1016/J.GSF.2017.12.007, 2018.
Torsvik, T., Albretsen, J., Sundfjord, A., Kohler, J., Sandvik, A. D.,
Skarðhamar, J., Lindbäck, K., and Everett, A.: Impact of tidewater
glacier retreat on the fjord system: Modeling present and future circulation
in Kongsfjorden, Svalbard, Estuar. Coast. Shelf Sci., 220, 152–165,
https://doi.org/10.1016/J.ECSS.2019.02.005, 2019.
Trusel, L. D., Powell, R. D., Cumpston, R. M., and Brigham-Grette, J.: Modern
glacimarine processes and potential future behaviour of Kronebreen and
Kongsvegen polythermal tidewater glaciers, Kongsfjorden, Svalbard, Geol.
Soc. Spec. Publ., 344, 89–102, https://doi.org/10.1144/SP344.9, 2010.
Tuerena, R. E., Ganeshram, R. S., Geibert, W., Fallick, A. E., Dougans, J.,
Tait, A., Henley, S. F., and Woodward, E. M. S.: Nutrient cycling in the
Atlantic basin: The evolution of nitrate isotope signatures in water masses,
Global Biogeochem. Cy., 29, 1830–1844, https://doi.org/10.1002/2015GB005164,
2015.
Tuerena, R. E., Hopkins, J., Buchanan, P. J., Ganeshram, R. S., Norman, L.,
von Appen, W. J., Tagliabue, A., Doncila, A., Graeve, M., Ludwichowski, K.
U., Dodd, P. A., de la Vega, C., Salter, I., and Mahaffey, C.: An Arctic
strait of two halves: The changing dynamics of nutrient uptake and
limitation across the Fram Strait, Global Biogeochem. Cy., 35,
e2021GB006961, https://doi.org/10.1029/2021GB006961, 2021a.
Tuerena, R. E., Hopkins, J., Ganeshram, R. S., Norman, L., De La Vega, C.,
Jeffreys, R., and Mahaffey, C.: Nitrate assimilation and regeneration in the
Barents Sea: Insights from nitrate isotopes, Biogeosciences, 18,
637–653, https://doi.org/10.5194/bg-18-637-2021, 2021b.
Tverberg, V., Skogseth, R., Cottier, F., Sundfjord, A., Walczowski, W.,
Inall, M. E., Falck, E., Pavlova, O., and Nilsen, F.: The Kongsfjorden Transect: Seasonal and Inter-annual Variability in Hydrograph, in: The Ecosystem of Kongsfjorden, Svalbard, edited by: Hop, H. and Wiencke, C., Advances in Polar Ecology, Vol. 2, Springer, Cham, 49–104,
https://doi.org/10.1007/978-3-319-46425-1_3, 2019.
Vega, C. P., Björkman, M. P., Pohjola, V. A., Isaksson, E., Pettersson,
R., Martma, T., Marca, A., and Kaiser, J.: Nitrate stable isotopes and major
ions in snow and ice samples from four Svalbard sites, Polar Res., 34, 23246, https://doi.org/10.3402/polar.v34.23246,
2015.
Vonk, J. E., Tank, S. E., Bowden, W. B., Laurion, I., Vincent, W. F.,
Alekseychik, P., Amyot, M., Billet, M. F., Canário, J., Cory, R. M.,
Deshpande, B. N., Helbig, M., Jammet, M., Karlsson, J., Larouche, J.,
Macmillan, G., Rautio, M., Walter Anthony, K. M., and Wickland, K. P.:
Reviews and syntheses: Effects of permafrost thaw on Arctic aquatic
ecosystems, Biogeosciences, 12, 7129–7167, https://doi.org/10.5194/bg-12-7129-2015,
2015.
Wallace, M. I., Cottier, F. R., Berge, J., Tarling, G. A., Griffiths, C., and
Brierley, A. S.: Comparison of zooplankton vertical migration in an ice-free
and a seasonally ice-covered Arctic fjord: An insight into the influence of
sea ice cover on zooplankton behavior, Limnol. Oceanogr., 55, 831–845,
https://doi.org/10.4319/LO.2010.55.2.0831, 2010.
Wang, C., Shi, L., Gerland, S., Granskog, M. A., Renner, A. H. H., Li, Z.,
Hansen, E., and Martma, T.: Spring sea-ice evolution in Rijpfjorden
(80∘ N), Svalbard, from in situ measurements and ice mass-balance
buoy (IMB) data, Ann. Glaciol., 54, 253–260, https://doi.org/10.3189/2013AOG62A135,
2013.
Wankel, S. D., Kendall, C., and Paytan, A.: Using nitrate dual isotopic
composition (δ15N and δ18O) as a tool for
exploring sources and cycling of nitrate in an estuarine system: Elkhorn
Slough, California, J. Geophys. Res.-Biogeo., 114, 1011,
https://doi.org/10.1029/2008JG000729, 2009.
Weigand, M. A., Foriel, J., Barnett, B., Oleynik, S., and Sigman, D. M.:
Updates to instrumentation and protocols for isotopic analysis of nitrate by
the denitrifier method, Rapid Commun. Mass Spectrom., 30, 1365–1383,
https://doi.org/10.1002/rcm.7570, 2016.
Wynn, P. M., Hodson, A. J., Heaton, T. H. E., and Chenery, S. R.: Nitrate
production beneath a High Arctic glacier, Svalbard, Chem. Geol., 244,
88–102, https://doi.org/10.1016/J.CHEMGEO.2007.06.008, 2007.
Yamamoto-Kawai, M., Carmack, E., and McLaughlin, F.: Nitrogen balance and
Arctic throughflow, Nature, 443, p. 43, https://doi.org/10.1038/443043a, 2006.
Yang, Y., Ren, J., and Zhu, Z.: Distributions and Influencing Factors of
Dissolved Manganese in Kongsfjorden and Ny-Ålesund, Svalbard, ACS Earth
Sp. Chem., 6, 1259–1268, https://doi.org/10.1021/acsearthspacechem.1c00388, 2022.
Zehr, J. P. and Capone, D. G.: Changing perspectives in marine nitrogen
fixation, Science, 368, 6492, https://doi.org/10.1126/science.aay9514, 2020.
Zhu, Z. Y., Wu, Y., Liu, S. M., Wenger, F., Hu, J., Zhang, J., and Zhang, R.
F: Organic carbon flux and particulate organic matter composition in Arctic
valley glaciers: examples from the Bayelva River and adjacent Kongsfjorden,
Biogeosciences, 13, 975–987, https://doi.org/10.5194/bg-13-975-2016, 2016.
Short summary
Terrestrial sources of nitrate are important contributors to the nutrient pool in the fjords of Kongsfjorden and Rijpfjorden in Svalbard during the summer, and they sustain most of the fjord primary productivity. Ongoing tidewater glacier retreat is postulated to favour light limitation and less dynamic circulation in fjords. This is suggested to encourage the export of nutrients to the middle and outer part of the fjord system, which may enhance primary production within and in offshore areas.
Terrestrial sources of nitrate are important contributors to the nutrient pool in the fjords of...
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