Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring
Here we test the hypothesis that winds have an important role in determining the rate of exchange of CO 2 between the atmosphere and ocean through wind stirring over the Southern Ocean. This is tested with a sensitivity study using an ad hoc parameterization of wind stirring in an ocean carbon cycle...
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ftcopernicus:oai:publications.copernicus.org:bg21597 2023-05-15T18:24:21+02:00 Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring Rodgers, K. B. Aumont, O. Mikaloff Fletcher, S. E. Plancherel, Y. Bopp, L. de Boyer Montégut, C. Iudicone, D. Keeling, R. F. Madec, G. Wanninkhof, R. 2018-09-27 application/pdf https://doi.org/10.5194/bg-11-4077-2014 https://www.biogeosciences.net/11/4077/2014/ eng eng doi:10.5194/bg-11-4077-2014 https://www.biogeosciences.net/11/4077/2014/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-11-4077-2014 2019-12-24T09:54:19Z Here we test the hypothesis that winds have an important role in determining the rate of exchange of CO 2 between the atmosphere and ocean through wind stirring over the Southern Ocean. This is tested with a sensitivity study using an ad hoc parameterization of wind stirring in an ocean carbon cycle model, where the objective is to identify the way in which perturbations to the vertical density structure of the planetary boundary in the ocean impacts the carbon cycle and ocean biogeochemistry. Wind stirring leads to reduced uptake of CO 2 by the Southern Ocean over the period 2000–2006, with a relative reduction with wind stirring on the order of 0.9 Pg C yr −1 over the region south of 45° S. This impacts not only the mean carbon uptake, but also the phasing of the seasonal cycle of carbon and other ocean biogeochemical tracers. Enhanced wind stirring delays the seasonal onset of stratification, and this has large impacts on both entrainment and the biological pump. It is also found that there is a strong reduction on the order of 25–30% in the concentrations of NO 3 exported in Subantarctic Mode Water (SAMW) to wind stirring. This finds expression not only locally over the Southern Ocean, but also over larger scales through the impact on advected nutrients. In summary, the large sensitivity identified with the ad hoc wind stirring parameterization offers support for the importance of wind stirring for global ocean biogeochemistry through its impact over the Southern Ocean. Text Southern Ocean Copernicus Publications: E-Journals Southern Ocean Biogeosciences 11 15 4077 4098 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Here we test the hypothesis that winds have an important role in determining the rate of exchange of CO 2 between the atmosphere and ocean through wind stirring over the Southern Ocean. This is tested with a sensitivity study using an ad hoc parameterization of wind stirring in an ocean carbon cycle model, where the objective is to identify the way in which perturbations to the vertical density structure of the planetary boundary in the ocean impacts the carbon cycle and ocean biogeochemistry. Wind stirring leads to reduced uptake of CO 2 by the Southern Ocean over the period 2000–2006, with a relative reduction with wind stirring on the order of 0.9 Pg C yr −1 over the region south of 45° S. This impacts not only the mean carbon uptake, but also the phasing of the seasonal cycle of carbon and other ocean biogeochemical tracers. Enhanced wind stirring delays the seasonal onset of stratification, and this has large impacts on both entrainment and the biological pump. It is also found that there is a strong reduction on the order of 25–30% in the concentrations of NO 3 exported in Subantarctic Mode Water (SAMW) to wind stirring. This finds expression not only locally over the Southern Ocean, but also over larger scales through the impact on advected nutrients. In summary, the large sensitivity identified with the ad hoc wind stirring parameterization offers support for the importance of wind stirring for global ocean biogeochemistry through its impact over the Southern Ocean. |
format |
Text |
author |
Rodgers, K. B. Aumont, O. Mikaloff Fletcher, S. E. Plancherel, Y. Bopp, L. de Boyer Montégut, C. Iudicone, D. Keeling, R. F. Madec, G. Wanninkhof, R. |
spellingShingle |
Rodgers, K. B. Aumont, O. Mikaloff Fletcher, S. E. Plancherel, Y. Bopp, L. de Boyer Montégut, C. Iudicone, D. Keeling, R. F. Madec, G. Wanninkhof, R. Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring |
author_facet |
Rodgers, K. B. Aumont, O. Mikaloff Fletcher, S. E. Plancherel, Y. Bopp, L. de Boyer Montégut, C. Iudicone, D. Keeling, R. F. Madec, G. Wanninkhof, R. |
author_sort |
Rodgers, K. B. |
title |
Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring |
title_short |
Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring |
title_full |
Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring |
title_fullStr |
Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring |
title_full_unstemmed |
Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring |
title_sort |
strong sensitivity of southern ocean carbon uptake and nutrient cycling to wind stirring |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-11-4077-2014 https://www.biogeosciences.net/11/4077/2014/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-11-4077-2014 https://www.biogeosciences.net/11/4077/2014/ |
op_doi |
https://doi.org/10.5194/bg-11-4077-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
15 |
container_start_page |
4077 |
op_container_end_page |
4098 |
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1766204794365542400 |