Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode
Stratospheric ozone depletion and emission of greenhouse gases lead to a trend of the southern annular mode (SAM) toward its high-index polarity. The positive phase of the SAM is characterized by stronger than usual westerly winds that induce changes in the physical carbon transport. Changes in the...
Published in: | Global Biogeochemical Cycles |
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Language: | English |
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AGU (American Geophysical Union)
2013
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Online Access: | https://oceanrep.geomar.de/id/eprint/32251/ https://oceanrep.geomar.de/id/eprint/32251/1/gbc20110.pdf https://doi.org/10.1002/2013GB004600 |
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ftoceanrep:oai:oceanrep.geomar.de:32251 2023-05-15T18:25:05+02:00 Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode Hauck, Judith Völker, Christoph Wang, Tingting Hoppema, Mario Losch, Martin Wolf-Gladrow, Dieter A. 2013 text https://oceanrep.geomar.de/id/eprint/32251/ https://oceanrep.geomar.de/id/eprint/32251/1/gbc20110.pdf https://doi.org/10.1002/2013GB004600 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/32251/1/gbc20110.pdf Hauck, J., Völker, C., Wang, T., Hoppema, M., Losch, M. and Wolf-Gladrow, D. A. (2013) Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode. Open Access Global Biogeochemical Cycles, 27 (4). pp. 1236-1245. DOI 10.1002/2013GB004600 <https://doi.org/10.1002/2013GB004600>. doi:10.1002/2013GB004600 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1002/2013GB004600 2023-04-07T15:25:13Z Stratospheric ozone depletion and emission of greenhouse gases lead to a trend of the southern annular mode (SAM) toward its high-index polarity. The positive phase of the SAM is characterized by stronger than usual westerly winds that induce changes in the physical carbon transport. Changes in the natural carbon budget of the upper 100 m of the Southern Ocean in response to a positive SAM phase are explored with a coupled ecosystem-general circulation model and regression analysis. Previously overlooked processes that are important for the upper ocean carbon budget during a positive SAM period are identified, namely, export production and downward transport of carbon north of the polar front (PF) as large as the upwelling in the south. The limiting micronutrient iron is brought into the surface layer by upwelling and stimulates phytoplankton growth and export production but only in summer. This leads to a drawdown of carbon and less summertime outgassing (or more uptake) of natural CO2. In winter, biological mechanisms are inactive, and the surface ocean equilibrates with the atmosphere by releasing CO2. In the annual mean, the upper ocean region south of the PF loses more carbon by additional export production than by the release of CO2 into the atmosphere, highlighting the role of the biological carbon pump in response to a positive SAM event. Article in Journal/Newspaper Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Southern Ocean Global Biogeochemical Cycles 27 4 1236 1245 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Stratospheric ozone depletion and emission of greenhouse gases lead to a trend of the southern annular mode (SAM) toward its high-index polarity. The positive phase of the SAM is characterized by stronger than usual westerly winds that induce changes in the physical carbon transport. Changes in the natural carbon budget of the upper 100 m of the Southern Ocean in response to a positive SAM phase are explored with a coupled ecosystem-general circulation model and regression analysis. Previously overlooked processes that are important for the upper ocean carbon budget during a positive SAM period are identified, namely, export production and downward transport of carbon north of the polar front (PF) as large as the upwelling in the south. The limiting micronutrient iron is brought into the surface layer by upwelling and stimulates phytoplankton growth and export production but only in summer. This leads to a drawdown of carbon and less summertime outgassing (or more uptake) of natural CO2. In winter, biological mechanisms are inactive, and the surface ocean equilibrates with the atmosphere by releasing CO2. In the annual mean, the upper ocean region south of the PF loses more carbon by additional export production than by the release of CO2 into the atmosphere, highlighting the role of the biological carbon pump in response to a positive SAM event. |
format |
Article in Journal/Newspaper |
author |
Hauck, Judith Völker, Christoph Wang, Tingting Hoppema, Mario Losch, Martin Wolf-Gladrow, Dieter A. |
spellingShingle |
Hauck, Judith Völker, Christoph Wang, Tingting Hoppema, Mario Losch, Martin Wolf-Gladrow, Dieter A. Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode |
author_facet |
Hauck, Judith Völker, Christoph Wang, Tingting Hoppema, Mario Losch, Martin Wolf-Gladrow, Dieter A. |
author_sort |
Hauck, Judith |
title |
Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode |
title_short |
Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode |
title_full |
Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode |
title_fullStr |
Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode |
title_full_unstemmed |
Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode |
title_sort |
seasonally different carbon flux changes in the southern ocean in response to the southern annular mode |
publisher |
AGU (American Geophysical Union) |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/32251/ https://oceanrep.geomar.de/id/eprint/32251/1/gbc20110.pdf https://doi.org/10.1002/2013GB004600 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/32251/1/gbc20110.pdf Hauck, J., Völker, C., Wang, T., Hoppema, M., Losch, M. and Wolf-Gladrow, D. A. (2013) Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode. Open Access Global Biogeochemical Cycles, 27 (4). pp. 1236-1245. DOI 10.1002/2013GB004600 <https://doi.org/10.1002/2013GB004600>. doi:10.1002/2013GB004600 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2013GB004600 |
container_title |
Global Biogeochemical Cycles |
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27 |
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4 |
container_start_page |
1236 |
op_container_end_page |
1245 |
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1766206280256454656 |