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 biogeochemistry model (OGCBM) to examine the impact of artif...
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ftccsdartic:oai:HAL:hal-04113607v1 2023-06-18T03:43:12+02:00 Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability Dutreuil, S. Bopp, L. Tagliabue, A. École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL) 2009 https://hal.science/hal-04113607 https://doi.org/10.5194/bg-6-901-200910.5194/bgd-6-1-2009 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-6-901-200910.5194/bgd-6-1-2009 hal-04113607 https://hal.science/hal-04113607 BIBCODE: 2009BGeo.6.901D doi:10.5194/bg-6-901-200910.5194/bgd-6-1-2009 Biogeosciences https://hal.science/hal-04113607 Biogeosciences, 2009, 6, pp.901-912. ⟨10.5194/bg-6-901-200910.5194/bgd-6-1-2009⟩ Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.5194/bg-6-901-200910.5194/bgd-6-1-2009 2023-06-03T23:50:44Z 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 biogeochemistry model (OGCBM) to examine the impact of artificially 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) during 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), alkalinity 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 implications for understanding how natural variability in vertical mixing in different ocean regions (such as that observed recently 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
Earth Science [SDU]Sciences of the Universe [physics] Dutreuil, S. Bopp, L. Tagliabue, A. Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
topic_facet |
Earth Science [SDU]Sciences of the Universe [physics] |
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 biogeochemistry model (OGCBM) to examine the impact of artificially 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) during 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), alkalinity 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 implications for understanding how natural variability in vertical mixing in different ocean regions (such as that observed recently in the Southern Ocean) can impact the ocean CO 2 sink via changes in DIC, alkalinity and carbon export. |
author2 |
École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
Dutreuil, S. Bopp, L. Tagliabue, A. |
author_facet |
Dutreuil, S. Bopp, L. Tagliabue, A. |
author_sort |
Dutreuil, S. |
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-04113607 https://doi.org/10.5194/bg-6-901-200910.5194/bgd-6-1-2009 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Biogeosciences https://hal.science/hal-04113607 Biogeosciences, 2009, 6, pp.901-912. ⟨10.5194/bg-6-901-200910.5194/bgd-6-1-2009⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-6-901-200910.5194/bgd-6-1-2009 hal-04113607 https://hal.science/hal-04113607 BIBCODE: 2009BGeo.6.901D doi:10.5194/bg-6-901-200910.5194/bgd-6-1-2009 |
op_doi |
https://doi.org/10.5194/bg-6-901-200910.5194/bgd-6-1-2009 |
_version_ |
1769009487993110528 |