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Open ocean gas transfer velocity derived from long‐term direct measurements of the CO 2 flux
Author(s) -
Prytherch John,
Yelland Margaret J.,
Pascal Robin W.,
Moat Bengamin I.,
Skjelvan Ingunn,
Srokosz Meric A.
Publication year - 2010
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2010gl045597
Subject(s) - eddy covariance , flux (metallurgy) , wind speed , gas analyzer , environmental science , atmospheric sciences , trace gas , meteorology , physics , materials science , chemistry , ecology , ecosystem , environmental chemistry , metallurgy , biology
Air‐sea open ocean CO 2 flux measurements have been made using the Eddy Covariance (EC) technique onboard the weathership Polarfront in the North Atlantic between September 2006 and December 2009. Flux measurements were made using an autonomous system ‘AutoFlux’. CO 2 mass density was measured with an open‐path infrared gas analyzer. Following quality control procedures, 3938 20‐minute flux measurements were made at mean wind speeds up to 19.6 m/s, significantly higher wind speeds than previously published results. The uncertainty in the determination of gas transfer velocities is large, but the mean relationship to wind speed allows a new parameterisation of the gas transfer velocity to be determined. A cubic dependence of gas transfer on wind speed is found, suggesting a significant influence of bubble‐mediated exchange on gas transfer.