Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean
Sea-to-air and diapycnal fluxes of nitrous oxide (N2O) into the mixed layer were determined during three cruises to the upwelling region off Mauritania. Sea-to-air fluxes as well as diapycnal fluxes were elevated close to the shelf break, but elevated sea-to-air fluxes reached further offshore as a...
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Copernicus Publications (EGU)
2012
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ftoceanrep:oai:oceanrep.geomar.de:13966 2023-05-15T17:33:38+02:00 Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean Kock, Annette Schafstall, Jens Dengler, Marcus Brandt, Peter Bange, Hermann W. 2012 text https://oceanrep.geomar.de/id/eprint/13966/ https://oceanrep.geomar.de/id/eprint/13966/1/bg-9-957-2012.pdf http://www.biogeosciences.net/9/957/2012/bg-9-957-2012.html https://doi.org/10.5194/bg-9-957-2012 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/13966/1/bg-9-957-2012.pdf Kock, A. , Schafstall, J., Dengler, M. , Brandt, P. and Bange, H. W. (2012) Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean. Open Access Biogeosciences (BG), 9 . pp. 957-964. DOI 10.5194/bg-9-957-2012 <https://doi.org/10.5194/bg-9-957-2012>. doi:10.5194/bg-9-957-2012 info:eu-repo/semantics/openAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.5194/bg-9-957-2012 2023-04-07T15:03:20Z Sea-to-air and diapycnal fluxes of nitrous oxide (N2O) into the mixed layer were determined during three cruises to the upwelling region off Mauritania. Sea-to-air fluxes as well as diapycnal fluxes were elevated close to the shelf break, but elevated sea-to-air fluxes reached further offshore as a result of the offshore transport of upwelled water masses. To calculate a mixed layer budget for N2O we compared the regionally averaged sea-to-air and diapycnal fluxes and estimated the potential contribution of other processes, such as vertical advection and biological N2O production in the mixed layer. Using common parameterizations for the gas transfer velocity, the comparison of the average sea-toair and diapycnal N2O fluxes indicated that the mean sea-toair flux is about three to four times larger than the diapycnal flux. Neither vertical and horizontal advection nor biological production were found sufficient to close the mixed layer budget. Instead, the sea-to-air flux, calculated using a parameterization that takes into account the attenuating effect of surfactants on gas exchange, is in the same range as the diapycnal flux. From our observations we conclude that common parameterizations for the gas transfer velocity likely overestimate the air-sea gas exchange within highly productive upwelling zones. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Biogeosciences 9 3 957 964 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Sea-to-air and diapycnal fluxes of nitrous oxide (N2O) into the mixed layer were determined during three cruises to the upwelling region off Mauritania. Sea-to-air fluxes as well as diapycnal fluxes were elevated close to the shelf break, but elevated sea-to-air fluxes reached further offshore as a result of the offshore transport of upwelled water masses. To calculate a mixed layer budget for N2O we compared the regionally averaged sea-to-air and diapycnal fluxes and estimated the potential contribution of other processes, such as vertical advection and biological N2O production in the mixed layer. Using common parameterizations for the gas transfer velocity, the comparison of the average sea-toair and diapycnal N2O fluxes indicated that the mean sea-toair flux is about three to four times larger than the diapycnal flux. Neither vertical and horizontal advection nor biological production were found sufficient to close the mixed layer budget. Instead, the sea-to-air flux, calculated using a parameterization that takes into account the attenuating effect of surfactants on gas exchange, is in the same range as the diapycnal flux. From our observations we conclude that common parameterizations for the gas transfer velocity likely overestimate the air-sea gas exchange within highly productive upwelling zones. |
format |
Article in Journal/Newspaper |
author |
Kock, Annette Schafstall, Jens Dengler, Marcus Brandt, Peter Bange, Hermann W. |
spellingShingle |
Kock, Annette Schafstall, Jens Dengler, Marcus Brandt, Peter Bange, Hermann W. Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean |
author_facet |
Kock, Annette Schafstall, Jens Dengler, Marcus Brandt, Peter Bange, Hermann W. |
author_sort |
Kock, Annette |
title |
Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean |
title_short |
Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean |
title_full |
Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean |
title_fullStr |
Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean |
title_full_unstemmed |
Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean |
title_sort |
sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical north atlantic ocean |
publisher |
Copernicus Publications (EGU) |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/13966/ https://oceanrep.geomar.de/id/eprint/13966/1/bg-9-957-2012.pdf http://www.biogeosciences.net/9/957/2012/bg-9-957-2012.html https://doi.org/10.5194/bg-9-957-2012 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/13966/1/bg-9-957-2012.pdf Kock, A. , Schafstall, J., Dengler, M. , Brandt, P. and Bange, H. W. (2012) Sea-to-air and diapycnalnitrous oxide fluxes in the eastern tropical North Atlantic Ocean. Open Access Biogeosciences (BG), 9 . pp. 957-964. DOI 10.5194/bg-9-957-2012 <https://doi.org/10.5194/bg-9-957-2012>. doi:10.5194/bg-9-957-2012 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-9-957-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
3 |
container_start_page |
957 |
op_container_end_page |
964 |
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1766132206899560448 |