Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability
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 vertic...
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ftdoajarticles:oai:doaj.org/article:acb1c675adc94fbdba709a6aabb7d03e 2023-05-15T18:25:38+02:00 Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability S. Dutreuil L. Bopp A. Tagliabue 2009-05-01T00:00:00Z https://doaj.org/article/acb1c675adc94fbdba709a6aabb7d03e EN eng Copernicus Publications http://www.biogeosciences.net/6/901/2009/bg-6-901-2009.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/acb1c675adc94fbdba709a6aabb7d03e Biogeosciences, Vol 6, Iss 5, Pp 901-912 (2009) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2009 ftdoajarticles 2022-12-30T22:10:01Z 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 p CO 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 Directory of Open Access Journals: DOAJ Articles Southern Ocean |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 S. Dutreuil L. Bopp A. Tagliabue Impact of enhanced vertical mixing on marine biogeochemistry: lessons for geo-engineering and natural variability |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
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 p CO 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. |
format |
Article in Journal/Newspaper |
author |
S. Dutreuil L. Bopp A. Tagliabue |
author_facet |
S. Dutreuil L. Bopp A. Tagliabue |
author_sort |
S. Dutreuil |
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 |
Copernicus Publications |
publishDate |
2009 |
url |
https://doaj.org/article/acb1c675adc94fbdba709a6aabb7d03e |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Biogeosciences, Vol 6, Iss 5, Pp 901-912 (2009) |
op_relation |
http://www.biogeosciences.net/6/901/2009/bg-6-901-2009.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/acb1c675adc94fbdba709a6aabb7d03e |
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1766207206286426112 |