Synoptic evaluation of carbon cycling in the Beaufort Sea during summer: contrasting river inputs, ecosystem metabolism and air–sea CO2 fluxes
International audience The accelerated decline in Arctic sea ice and an ongoing trend toward more energetic atmospheric and oceanic forcings are modifying carbon cycling in the Arctic Ocean. A critical issue is to understand how net community production (NCP; the balance between gross primary produc...
Published in: | Biogeosciences |
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Main Authors: | , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2014
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-01307716 https://hal.sorbonne-universite.fr/hal-01307716/document https://hal.sorbonne-universite.fr/hal-01307716/file/bg-11-2827-2014.pdf https://doi.org/10.5194/bg-11-2827-2014 |
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ftuniversailles:oai:HAL:hal-01307716v1 |
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record_format |
openpolar |
institution |
Open Polar |
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Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
op_collection_id |
ftuniversailles |
language |
English |
topic |
[SDV.EE]Life Sciences [q-bio]/Ecology environment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDV.EE]Life Sciences [q-bio]/Ecology environment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Forest, A Coupel, P Else, B Nahavandian, S Lansard, B Raimbault, Patrick Papakyriakou, T Gratton, Y Fortier, L Tremblay, J.-É Babin, M Synoptic evaluation of carbon cycling in the Beaufort Sea during summer: contrasting river inputs, ecosystem metabolism and air–sea CO2 fluxes |
topic_facet |
[SDV.EE]Life Sciences [q-bio]/Ecology environment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The accelerated decline in Arctic sea ice and an ongoing trend toward more energetic atmospheric and oceanic forcings are modifying carbon cycling in the Arctic Ocean. A critical issue is to understand how net community production (NCP; the balance between gross primary production and community respiration) responds to changes and modulates air–sea CO2 fluxes. Using data collected as part of the ArcticNet–Malina 2009 expedition in the southeastern Beaufort Sea (Arctic Ocean), we synthesize information on sea ice, wind, river, water column properties, metabolism of the planktonic food web, organic carbon fluxes and pools, as well as air–sea CO2 exchange, with the aim of documenting the ecosystem response to environmental changes. Data were analyzed to develop a non-steady-state carbon budget and an assessment of NCP against air–sea CO2 fluxes. During the field campaign, the mean wind field was a mild upwelling-favorable wind (∼ 5 km h−1) from the NE. A decaying ice cover (< 80 % concentration) was observed beyond the shelf, the latter being fully exposed to the atmosphere. We detected some areas where the surface mixed layer was net autotrophic owing to high rates of primary production (PP), but the ecosystem was overall net heterotrophic. The region acted nonetheless as a sink for atmospheric CO2, with an uptake rate of −2.0 ± 3.3 mmol C m −2 d −1 (mean ± standard deviation associated with spatial variability). We attribute this discrepancy to (1) elevated PP rates (> 600 mg C m −2 d −1) over the shelf prior to our survey, (2) freshwater dilution by river runoff and ice melt, and (3) the presence of cold surface waters offshore. Only the Mackenzie River delta and localized shelf areas directly affected by upwelling were identified as substantial sources of CO2 to the atmosphere (> 10 mmol C m−2 d−1). Daily PP rates were generally < 100 mg C m−2 d−1 and cumu-lated to a total PP of ∼ 437.6 × 10 3 t C for the region over a 35-day period. This amount was about twice the organic ... |
author2 |
Université Laval Québec (ULaval) University of Manitoba Winnipeg Centre Eau Terre Environnement Québec (INRS - ETE) Institut National de la Recherche Scientifique Québec (INRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Océan et Interfaces (OCEANIS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-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) |
format |
Article in Journal/Newspaper |
author |
Forest, A Coupel, P Else, B Nahavandian, S Lansard, B Raimbault, Patrick Papakyriakou, T Gratton, Y Fortier, L Tremblay, J.-É Babin, M |
author_facet |
Forest, A Coupel, P Else, B Nahavandian, S Lansard, B Raimbault, Patrick Papakyriakou, T Gratton, Y Fortier, L Tremblay, J.-É Babin, M |
author_sort |
Forest, A |
title |
Synoptic evaluation of carbon cycling in the Beaufort Sea during summer: contrasting river inputs, ecosystem metabolism and air–sea CO2 fluxes |
title_short |
Synoptic evaluation of carbon cycling in the Beaufort Sea during summer: contrasting river inputs, ecosystem metabolism and air–sea CO2 fluxes |
title_full |
Synoptic evaluation of carbon cycling in the Beaufort Sea during summer: contrasting river inputs, ecosystem metabolism and air–sea CO2 fluxes |
title_fullStr |
Synoptic evaluation of carbon cycling in the Beaufort Sea during summer: contrasting river inputs, ecosystem metabolism and air–sea CO2 fluxes |
title_full_unstemmed |
Synoptic evaluation of carbon cycling in the Beaufort Sea during summer: contrasting river inputs, ecosystem metabolism and air–sea CO2 fluxes |
title_sort |
synoptic evaluation of carbon cycling in the beaufort sea during summer: contrasting river inputs, ecosystem metabolism and air–sea co2 fluxes |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.sorbonne-universite.fr/hal-01307716 https://hal.sorbonne-universite.fr/hal-01307716/document https://hal.sorbonne-universite.fr/hal-01307716/file/bg-11-2827-2014.pdf https://doi.org/10.5194/bg-11-2827-2014 |
genre |
Arctic Arctic Ocean ArcticNet Beaufort Sea Mackenzie river Sea ice |
genre_facet |
Arctic Arctic Ocean ArcticNet Beaufort Sea Mackenzie river Sea ice |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.sorbonne-universite.fr/hal-01307716 Biogeosciences, 2014, 11 (10), pp.2827-2856. ⟨10.5194/bg-11-2827-2014⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-11-2827-2014 hal-01307716 https://hal.sorbonne-universite.fr/hal-01307716 https://hal.sorbonne-universite.fr/hal-01307716/document https://hal.sorbonne-universite.fr/hal-01307716/file/bg-11-2827-2014.pdf doi:10.5194/bg-11-2827-2014 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-11-2827-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
10 |
container_start_page |
2827 |
op_container_end_page |
2856 |
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1797577851001634816 |
spelling |
ftuniversailles:oai:HAL:hal-01307716v1 2024-04-28T08:09:31+00:00 Synoptic evaluation of carbon cycling in the Beaufort Sea during summer: contrasting river inputs, ecosystem metabolism and air–sea CO2 fluxes Forest, A Coupel, P Else, B Nahavandian, S Lansard, B Raimbault, Patrick Papakyriakou, T Gratton, Y Fortier, L Tremblay, J.-É Babin, M Université Laval Québec (ULaval) University of Manitoba Winnipeg Centre Eau Terre Environnement Québec (INRS - ETE) Institut National de la Recherche Scientifique Québec (INRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Océan et Interfaces (OCEANIS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-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) 2014 https://hal.sorbonne-universite.fr/hal-01307716 https://hal.sorbonne-universite.fr/hal-01307716/document https://hal.sorbonne-universite.fr/hal-01307716/file/bg-11-2827-2014.pdf https://doi.org/10.5194/bg-11-2827-2014 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-11-2827-2014 hal-01307716 https://hal.sorbonne-universite.fr/hal-01307716 https://hal.sorbonne-universite.fr/hal-01307716/document https://hal.sorbonne-universite.fr/hal-01307716/file/bg-11-2827-2014.pdf doi:10.5194/bg-11-2827-2014 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.sorbonne-universite.fr/hal-01307716 Biogeosciences, 2014, 11 (10), pp.2827-2856. ⟨10.5194/bg-11-2827-2014⟩ [SDV.EE]Life Sciences [q-bio]/Ecology environment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2014 ftuniversailles https://doi.org/10.5194/bg-11-2827-2014 2024-04-04T17:39:21Z International audience The accelerated decline in Arctic sea ice and an ongoing trend toward more energetic atmospheric and oceanic forcings are modifying carbon cycling in the Arctic Ocean. A critical issue is to understand how net community production (NCP; the balance between gross primary production and community respiration) responds to changes and modulates air–sea CO2 fluxes. Using data collected as part of the ArcticNet–Malina 2009 expedition in the southeastern Beaufort Sea (Arctic Ocean), we synthesize information on sea ice, wind, river, water column properties, metabolism of the planktonic food web, organic carbon fluxes and pools, as well as air–sea CO2 exchange, with the aim of documenting the ecosystem response to environmental changes. Data were analyzed to develop a non-steady-state carbon budget and an assessment of NCP against air–sea CO2 fluxes. During the field campaign, the mean wind field was a mild upwelling-favorable wind (∼ 5 km h−1) from the NE. A decaying ice cover (< 80 % concentration) was observed beyond the shelf, the latter being fully exposed to the atmosphere. We detected some areas where the surface mixed layer was net autotrophic owing to high rates of primary production (PP), but the ecosystem was overall net heterotrophic. The region acted nonetheless as a sink for atmospheric CO2, with an uptake rate of −2.0 ± 3.3 mmol C m −2 d −1 (mean ± standard deviation associated with spatial variability). We attribute this discrepancy to (1) elevated PP rates (> 600 mg C m −2 d −1) over the shelf prior to our survey, (2) freshwater dilution by river runoff and ice melt, and (3) the presence of cold surface waters offshore. Only the Mackenzie River delta and localized shelf areas directly affected by upwelling were identified as substantial sources of CO2 to the atmosphere (> 10 mmol C m−2 d−1). Daily PP rates were generally < 100 mg C m−2 d−1 and cumu-lated to a total PP of ∼ 437.6 × 10 3 t C for the region over a 35-day period. This amount was about twice the organic ... Article in Journal/Newspaper Arctic Arctic Ocean ArcticNet Beaufort Sea Mackenzie river Sea ice Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Biogeosciences 11 10 2827 2856 |