Physics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3101101g&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 31, CiteID L01101
Physics
Atmospheric Composition And Structure: Cloud Physics And Chemistry, Meteorology And Atmospheric Dynamics: Convective Processes, Meteorology And Atmospheric Dynamics: Mesoscale Meteorology, Meteorology And Atmospheric Dynamics: Remote Sensing, Meteorology And Atmospheric Dynamics: Tropical Meteorology
Scientific paper
Large uncertainties still remain about the mechanisms of genesis and interaction of clouds in a large scale environment. Through a semi-empirical dynamical model using hourly data from TOGA-COARE IOP (130E-180E and 15S-15N, 01.11.91-28.02.92), we show that the convective activity leading to clouds is a self-regulating, threshold process embedded in a large-scale environment. The convective activity is prescribed through a of hourly fractional cloud cover while the environmental forcings are defined in terms large-scale moist state defined in terms of the average brightness temperature. A prognostic model is then developed for cloud cover as the dynamical variable. To validate the model we integrate it with a given initial condition from observed data. The model reproduces the observed spatio-temporal structure of the cloud with a remarkable degree of success. We identify and quantify two thresholds for large-scale forcing for genesis and intensity of high clouds.
Goswami Pallab
Liberti G. L.
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