The fate of riverine nutrients on Arctic shelves
International audience Present and future levels of primary production(PP) in the Arctic Ocean (AO) depend on nutrient inputsto the photic zone via vertical mixing, upwelling and externalsources. In this regard, the importance of horizontalriver supply relative to oceanic processes is poorly constra...
Published in: | Biogeosciences |
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Main Authors: | , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Online Access: | https://hal.archives-ouvertes.fr/hal-01089953 https://hal.archives-ouvertes.fr/hal-01089953v2/document https://hal.archives-ouvertes.fr/hal-01089953v2/file/bg-10-3661-2013.pdf https://doi.org/10.5194/bg-10-3661-2013 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
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English |
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[SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Le Fouest, V. Babin, M. Tremblay, J.-É. The fate of riverine nutrients on Arctic shelves |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Present and future levels of primary production(PP) in the Arctic Ocean (AO) depend on nutrient inputsto the photic zone via vertical mixing, upwelling and externalsources. In this regard, the importance of horizontalriver supply relative to oceanic processes is poorly constrainedat the pan-Arctic scale. We compiled extensive historical(1954–2012) data on discharge and nutrient concentrationsto estimate fluxes of nitrate, soluble reactive phosphate(SRP), silicate, dissolved organic carbon (DOC), dissolvedorganic nitrogen (DON), particulate organic nitrogen(PON) and particulate organic carbon (POC) from 9 largeArctic rivers and assess their potential impact on the biogeochemistryof shelf waters. Several key points can be emphasizedfrom this analysis. The contribution of riverine nitrateto new PP (PPnew) is very small at the regional scale (<1%to 6.7 %) and negligible at the pan-Arctic scale (<0.83 %), inagreement with recent studies. By consuming all this nitrate,oceanic phytoplankton would be able to use only 14.3%and 8.7–24.5% of the river supply of silicate at the pan-Arctic and regional scales, respectively. Corresponding figuresfor SRP are 28.9% and 18.6–46 %. On the Beaufort andBering shelves, riverine SRP cannot fulfil phytoplankton requirements.On a seasonal basis, the removal of riverine nitrate,silicate and SRP would be the highest in spring andnot in summer when AO shelf waters are nitrogen-limited.Riverine DON is potentially an important nitrogen source forthe planktonic ecosystem in summer, when ammonium suppliedthrough the photoammonification of refractory DON(3.9×109 mol N) may exceed the combined riverine supplyof nitrate and ammonium (3.4×109 mol N). Nevertheless,overall nitrogen limitation of AO phytoplankton is expectedto persist even when projected increases of riverine DONand nitrate supply are taken into account. This analysis underscoresthe need to better contrast oceanic nutrient supplyprocesses with the composition and fate of changing riverinenutrient ... |
author2 |
LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Laval Québec (ULaval) |
format |
Article in Journal/Newspaper |
author |
Le Fouest, V. Babin, M. Tremblay, J.-É. |
author_facet |
Le Fouest, V. Babin, M. Tremblay, J.-É. |
author_sort |
Le Fouest, V. |
title |
The fate of riverine nutrients on Arctic shelves |
title_short |
The fate of riverine nutrients on Arctic shelves |
title_full |
The fate of riverine nutrients on Arctic shelves |
title_fullStr |
The fate of riverine nutrients on Arctic shelves |
title_full_unstemmed |
The fate of riverine nutrients on Arctic shelves |
title_sort |
fate of riverine nutrients on arctic shelves |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.archives-ouvertes.fr/hal-01089953 https://hal.archives-ouvertes.fr/hal-01089953v2/document https://hal.archives-ouvertes.fr/hal-01089953v2/file/bg-10-3661-2013.pdf https://doi.org/10.5194/bg-10-3661-2013 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Phytoplankton |
genre_facet |
Arctic Arctic Ocean Phytoplankton |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-01089953 Biogeosciences, European Geosciences Union, 2013, 10 (6), pp.3661 - 3677. ⟨10.5194/bg-10-3661-2013⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-3661-2013 hal-01089953 https://hal.archives-ouvertes.fr/hal-01089953 https://hal.archives-ouvertes.fr/hal-01089953v2/document https://hal.archives-ouvertes.fr/hal-01089953v2/file/bg-10-3661-2013.pdf doi:10.5194/bg-10-3661-2013 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-10-3661-2013 |
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Biogeosciences |
container_volume |
10 |
container_issue |
6 |
container_start_page |
3661 |
op_container_end_page |
3677 |
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1766321268010778624 |
spelling |
ftccsdartic:oai:HAL:hal-01089953v2 2023-05-15T14:50:14+02:00 The fate of riverine nutrients on Arctic shelves Le Fouest, V. Babin, M. Tremblay, J.-É. LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Laval Québec (ULaval) 2013 https://hal.archives-ouvertes.fr/hal-01089953 https://hal.archives-ouvertes.fr/hal-01089953v2/document https://hal.archives-ouvertes.fr/hal-01089953v2/file/bg-10-3661-2013.pdf https://doi.org/10.5194/bg-10-3661-2013 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-3661-2013 hal-01089953 https://hal.archives-ouvertes.fr/hal-01089953 https://hal.archives-ouvertes.fr/hal-01089953v2/document https://hal.archives-ouvertes.fr/hal-01089953v2/file/bg-10-3661-2013.pdf doi:10.5194/bg-10-3661-2013 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-01089953 Biogeosciences, European Geosciences Union, 2013, 10 (6), pp.3661 - 3677. ⟨10.5194/bg-10-3661-2013⟩ [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.5194/bg-10-3661-2013 2021-12-05T01:53:45Z International audience Present and future levels of primary production(PP) in the Arctic Ocean (AO) depend on nutrient inputsto the photic zone via vertical mixing, upwelling and externalsources. In this regard, the importance of horizontalriver supply relative to oceanic processes is poorly constrainedat the pan-Arctic scale. We compiled extensive historical(1954–2012) data on discharge and nutrient concentrationsto estimate fluxes of nitrate, soluble reactive phosphate(SRP), silicate, dissolved organic carbon (DOC), dissolvedorganic nitrogen (DON), particulate organic nitrogen(PON) and particulate organic carbon (POC) from 9 largeArctic rivers and assess their potential impact on the biogeochemistryof shelf waters. Several key points can be emphasizedfrom this analysis. The contribution of riverine nitrateto new PP (PPnew) is very small at the regional scale (<1%to 6.7 %) and negligible at the pan-Arctic scale (<0.83 %), inagreement with recent studies. By consuming all this nitrate,oceanic phytoplankton would be able to use only 14.3%and 8.7–24.5% of the river supply of silicate at the pan-Arctic and regional scales, respectively. Corresponding figuresfor SRP are 28.9% and 18.6–46 %. On the Beaufort andBering shelves, riverine SRP cannot fulfil phytoplankton requirements.On a seasonal basis, the removal of riverine nitrate,silicate and SRP would be the highest in spring andnot in summer when AO shelf waters are nitrogen-limited.Riverine DON is potentially an important nitrogen source forthe planktonic ecosystem in summer, when ammonium suppliedthrough the photoammonification of refractory DON(3.9×109 mol N) may exceed the combined riverine supplyof nitrate and ammonium (3.4×109 mol N). Nevertheless,overall nitrogen limitation of AO phytoplankton is expectedto persist even when projected increases of riverine DONand nitrate supply are taken into account. This analysis underscoresthe need to better contrast oceanic nutrient supplyprocesses with the composition and fate of changing riverinenutrient ... Article in Journal/Newspaper Arctic Arctic Ocean Phytoplankton Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Arctic Ocean Biogeosciences 10 6 3661 3677 |