Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1157l&link_type=abstract
Geophysical Research Letters, Volume 21, Issue 12, p. 1157-1160
Physics
33
Meteorology And Atmospheric Dynamics: Tropical Meteorology, Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions, Meteorology And Atmospheric Dynamics: Climatology
Scientific paper
In this paper, we investigate the relative importance of local vs remote control on cloud radiative forcing using a cumulus ensemble model. It is found that cloud and surface radiation forcings are much more sensitive to the mean vertical motion associated with large scale tropical circulation than to the local SST. When the local SST is icnreased with the mean vertical motion held constant, increased surface latent and sensivle heat flux associated with enhanced moisture recycling is found to be the primary mechanism for cooling the ocean surface. Large changes in surface shortwave fluxes are related to changes in cloudiness induced by changes in the large scale circulation. These results are consistent with a number of earlier empirical studies, which raised concerns regarding the validity of the cirrus-thermostat hypothesis (Ramanathan and Collins, 1991). It is argued that for a better understanding of cloud feedback, both local and remote controls need to be considered and that a cumulus ensemble model is a powerful tool that should be explored for such purpose.
Chou Ming-Dah
Lau Ka Ming
Sui Chung-Hsiung
Tao Wei-Kuo
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