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1997
Valero, FPJ, Collins WD, Pilewskie P, Bucholtz A, Flatau PJ.  1997.  Direct radiometric observations of the water vapor greenhouse effect over the equatorial Pacific ocean. Science. 275:1773-1776.   10.1126/science.275.5307.1773   AbstractWebsite

Airborne radiometric measurements were used to determine tropospheric profiles of the clear sky greenhouse effect. At sea surface temperatures (SSTs) larger than 300 kelvin, the clear sky water vapor greenhouse effect was found to increase with SST at a rate of 13 to 15 watts per square meter per kelvin. Satellite measurements of infrared radiances and SSTs indicate that almost 52 percent of the tropical oceans between 20 degrees N and 20 degrees S are affected during all seasons. Current general circulation models suggest that the increase in the clear sky water vapor greenhouse effect with SST may have climatic effects an a planetary scale.