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Bubble‐Mediated Gas Transfer and Gas Transfer Suppression of DMS and CO 2
Author(s) -
Zavarsky A.,
GoddijnMurphy L.,
Steinhoff T.,
Marandino C. A.
Publication year - 2018
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2017jd028071
Subject(s) - eddy covariance , bubble , atmospheric sciences , carbon dioxide , reynolds number , trace gas , mechanics , flux (metallurgy) , environmental science , meteorology , chemistry , turbulence , physics , biology , ecology , organic chemistry , ecosystem
Direct dimethyl sulfide (DMS) flux measurements using eddy covariance have shown a suppression of gas transfer at medium to high wind speed. However, not all eddy covariance measurements show evidence of this suppression. Processes, such as wave‐wind interaction and surfactants, have been postulated to cause this suppression. We measured DMS and carbon dioxide eddy covariance fluxes during the Asian summer monsoon in the western tropical Indian Ocean (July and August 2014). Both fluxes and their respective gas transfer velocities show signs of a gas transfer suppression above 10 m/s. Using a wind‐wave interaction, we describe a flow separation process that could be responsible for a suppression of gas transfer. As a result we provide a Reynolds number‐based parameterization, which states the likelihood of a gas transfer suppression for this cruise and previously published gas transfer data. Additionally, we compute the difference in the gas transfer velocities of DMS and CO 2 to estimate the bubble‐mediated gas transfer using a hybrid model with three whitecap parameterizations.