The ability of subtropical stratus low cloud cover to moderate or amplify the tropical response to climate forcing such as increased CO 2 is considered. Cloud radiative forcing over the subtropics is parameterized using an empirical relation between stratus cloud cover and the difference in potential temperature between 700 mb (a level that is above the trade inversion) and the surface. This relation includes the empirical negative correlation between SST and low cloud cover and is potentially a positive feedback to climate forcing.
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R. L. Miller (1997) studied this question.
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