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| Titel |
Measuring air–sea gas-exchange velocities in a large-scale annular wind–wave tank |
| VerfasserIn |
E. Mesarchaki, C. Kräuter, K. E. Krall, M. Bopp, F. Helleis, J. Williams, B. Jähne |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 11, no. 1 ; Nr. 11, no. 1 (2015-01-28), S.121-138 |
| Datensatznummer |
250117130
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| Publikation (Nr.) |
 copernicus.org/os-11-121-2015.pdf |
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| Zusammenfassung |
| In this study we present gas-exchange measurements conducted in a large-scale
wind–wave tank. Fourteen chemical species spanning a wide range of solubility
(dimensionless solubility, α = 0.4 to 5470) and diffusivity
(Schmidt number in water, Scw = 594 to 1194) were examined under
various turbulent (u10 = 0.73 to 13.2 m s−1)
conditions. Additional experiments were performed under different surfactant
modulated (two different concentration levels of Triton X-100) surface
states. This paper details the complete methodology, experimental procedure
and instrumentation used to derive the total transfer velocity for all
examined tracers. The results presented here demonstrate the efficacy of the
proposed method, and the derived gas-exchange velocities are shown to be
comparable to previous investigations. The gas transfer behaviour is
exemplified by contrasting two species at the two solubility extremes, namely
nitrous oxide (N2O) and methanol (CH3OH). Interestingly, a strong
transfer velocity reduction (up to a factor of 3) was observed for the
relatively insoluble N2O under a surfactant covered water surface. In
contrast, the surfactant effect for CH3OH, the high solubility tracer,
was significantly weaker. |
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