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| Titel |
Sea-to-air and diapycnal nitrous oxide fluxes in the eastern tropical North Atlantic Ocean |
| VerfasserIn |
A. Kock, J. Schafstall, M. Dengler, P. Brandt, H. W. Bange |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 3 ; Nr. 9, no. 3 (2012-03-07), S.957-964 |
| Datensatznummer |
250006836
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| Publikation (Nr.) |
 copernicus.org/bg-9-957-2012.pdf |
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| Zusammenfassung |
| 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-to-air and
diapycnal N2O fluxes indicated that the mean sea-to-air 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. |
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