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| Titel |
Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed |
| VerfasserIn |
T. G. Bell, W. De Bruyn, S. D. Miller, B. Ward, K. H. Christensen, E. S. Saltzman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 21 ; Nr. 13, no. 21 (2013-11-13), S.11073-11087 |
| Datensatznummer |
250085811
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| Publikation (Nr.) |
 copernicus.org/acp-13-11073-2013.pdf |
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| Zusammenfassung |
| Shipboard measurements of eddy covariance dimethylsulfide (DMS) air–sea fluxes and seawater
concentration were carried out in the North Atlantic bloom region in
June/July 2011. Gas transfer coefficients (k660) show a linear
dependence on mean horizontal wind speed at wind speeds up to 11 m s−1.
At higher wind speeds the relationship between k660 and wind speed
weakens. At high winds, measured DMS fluxes were lower than predicted based
on the linear relationship between wind speed and interfacial stress
extrapolated from low to intermediate wind speeds. In contrast, the transfer
coefficient for sensible heat did not exhibit this effect. The apparent
suppression of air–sea gas flux at higher wind speeds appears to be related
to sea state, as determined from shipboard wave measurements. These
observations are consistent with the idea that long waves suppress
near-surface water-side turbulence, and decrease interfacial gas transfer. This
effect may be more easily observed for DMS than for less soluble gases, such
as CO2, because the air–sea exchange of DMS is controlled by
interfacial rather than bubble-mediated gas transfer under high wind speed
conditions. |
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