Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability
International audience Artificially enhanced vertical mixing has been suggested as a means by which to fertilize the biological pump with subsurface nutrients and thus increase the oceanic CO 2 sink. We use an ocean general circulation and biogeo-chemistry model (OGCBM) to examine the impact of arti...
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ftinsu:oai:HAL:hal-01109181v1 2024-04-28T08:39:38+00:00 Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability Dutreuil, Sébastien Bopp, L Tagliabue, A Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) 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) Department of Earth Ocean and Ecological Sciences Liverpool University of Liverpool 2009 https://hal.science/hal-01109181 https://hal.science/hal-01109181/document https://hal.science/hal-01109181/file/Dutreuil%20Bopp%20Tagliabue%20-%20Biogeosciences%2009%20-%20impact.pdf https://doi.org/10.5194/bg-6-901-2009 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-6-901-2009 hal-01109181 https://hal.science/hal-01109181 https://hal.science/hal-01109181/document https://hal.science/hal-01109181/file/Dutreuil%20Bopp%20Tagliabue%20-%20Biogeosciences%2009%20-%20impact.pdf doi:10.5194/bg-6-901-2009 info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.science/hal-01109181 Biogeosciences, 2009, 6, pp.901 - 912. ⟨10.5194/bg-6-901-2009⟩ http://www.biogeosciences.net/6/901/2009/bg-6-901-2009.html geoengineering ocean pipes [SDE.IE]Environmental Sciences/Environmental Engineering [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2009 ftinsu https://doi.org/10.5194/bg-6-901-2009 2024-04-05T00:50:19Z International audience Artificially enhanced vertical mixing has been suggested as a means by which to fertilize the biological pump with subsurface nutrients and thus increase the oceanic CO 2 sink. We use an ocean general circulation and biogeo-chemistry model (OGCBM) to examine the impact of arti-ficially enhanced vertical mixing on biological productivity and atmospheric CO 2 , as well as the climatically significant gases nitrous oxide (N 2 O) and dimethyl sulphide (DMS) dur-ing simulations between 2000 and 2020. Overall, we find a large increase in the amount of organic carbon exported from surface waters, but an overall increase in atmospheric CO 2 concentrations by 2020. We quantified the individual effect of changes in dissolved inorganic carbon (DIC), alka-linity and biological production on the change in pCO 2 at characteristic sites and found the increased vertical supply of carbon rich subsurface water to be primarily responsible for the enhanced CO 2 outgassing, although increased alkalinity and, to a lesser degree, biological production can compensate in some regions. While ocean-atmosphere fluxes of DMS do increase slightly, which might reduce radiative forcing, the oceanic N 2 O source also expands. Our study has impli-cations for understanding how natural variability in vertical mixing in different ocean regions (such as that observed re-cently in the Southern Ocean) can impact the ocean CO 2 sink via changes in DIC, alkalinity and carbon export. Article in Journal/Newspaper Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Biogeosciences 6 5 901 912 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
geoengineering ocean pipes [SDE.IE]Environmental Sciences/Environmental Engineering [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
geoengineering ocean pipes [SDE.IE]Environmental Sciences/Environmental Engineering [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Dutreuil, Sébastien Bopp, L Tagliabue, A Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
topic_facet |
geoengineering ocean pipes [SDE.IE]Environmental Sciences/Environmental Engineering [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Artificially enhanced vertical mixing has been suggested as a means by which to fertilize the biological pump with subsurface nutrients and thus increase the oceanic CO 2 sink. We use an ocean general circulation and biogeo-chemistry model (OGCBM) to examine the impact of arti-ficially enhanced vertical mixing on biological productivity and atmospheric CO 2 , as well as the climatically significant gases nitrous oxide (N 2 O) and dimethyl sulphide (DMS) dur-ing simulations between 2000 and 2020. Overall, we find a large increase in the amount of organic carbon exported from surface waters, but an overall increase in atmospheric CO 2 concentrations by 2020. We quantified the individual effect of changes in dissolved inorganic carbon (DIC), alka-linity and biological production on the change in pCO 2 at characteristic sites and found the increased vertical supply of carbon rich subsurface water to be primarily responsible for the enhanced CO 2 outgassing, although increased alkalinity and, to a lesser degree, biological production can compensate in some regions. While ocean-atmosphere fluxes of DMS do increase slightly, which might reduce radiative forcing, the oceanic N 2 O source also expands. Our study has impli-cations for understanding how natural variability in vertical mixing in different ocean regions (such as that observed re-cently in the Southern Ocean) can impact the ocean CO 2 sink via changes in DIC, alkalinity and carbon export. |
author2 |
Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) 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) Department of Earth Ocean and Ecological Sciences Liverpool University of Liverpool |
format |
Article in Journal/Newspaper |
author |
Dutreuil, Sébastien Bopp, L Tagliabue, A |
author_facet |
Dutreuil, Sébastien Bopp, L Tagliabue, A |
author_sort |
Dutreuil, Sébastien |
title |
Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
title_short |
Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
title_full |
Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
title_fullStr |
Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
title_full_unstemmed |
Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
title_sort |
impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-01109181 https://hal.science/hal-01109181/document https://hal.science/hal-01109181/file/Dutreuil%20Bopp%20Tagliabue%20-%20Biogeosciences%2009%20-%20impact.pdf https://doi.org/10.5194/bg-6-901-2009 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.science/hal-01109181 Biogeosciences, 2009, 6, pp.901 - 912. ⟨10.5194/bg-6-901-2009⟩ http://www.biogeosciences.net/6/901/2009/bg-6-901-2009.html |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-6-901-2009 hal-01109181 https://hal.science/hal-01109181 https://hal.science/hal-01109181/document https://hal.science/hal-01109181/file/Dutreuil%20Bopp%20Tagliabue%20-%20Biogeosciences%2009%20-%20impact.pdf doi:10.5194/bg-6-901-2009 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-6-901-2009 |
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Biogeosciences |
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6 |
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5 |
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901 |
op_container_end_page |
912 |
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