Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1889w&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 13, p. 1889-1892
Physics
163
Atmospheric Composition And Structure: Air/Sea Constituent Fluxes, Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions, Oceanography: Physical: Air/Sea Interactions
Scientific paper
Using recent laboratory and field results we explore the possibility of a cubic relationship between gas exchange and instantaneous (or short-term) wind speed, and its impact on global air-sea fluxes. The theoretical foundation for such a dependency is based on retardation of gas transfer at low to intermediate winds by surfactants, which are ubiquitous in the world's oceans, and bubble-enhanced transfer at higher winds. The proposed cubic relationship shows a weaker dependence of gas transfer at low wind speed and a significantly stronger dependence at high wind speed than previous relationships. A long-term relationship derived from such a dependence, combined with the monthly CO2 climatology of Takahashi [1997], leads to an increase in the global annual oceanic CO2 uptake from 1.4 Gigaton Cyr-1 to 2.2 Gigaton Cyr-1. Although a cubic relationship fits within global bomb-14C oceanic uptake constraints, additional checks are warranted, particularly at high wind speeds where the enhancement is most pronounced.
McGillis Wade R.
Wanninkhof Rik
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