Tests of a convective cloud model with soundings during the TCM-90 field experiment.
Elsberry, Russell L.
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A new proposed scheme for representing cumulus convection in a large-scale numerical model has been tested using the dataset collected during the Tropical Cyclone Motion (TCM-90) field experiment. This new scheme incorporated some modifications by K. Emanuel, which are based on recent observations of convective clouds, and showed much of the vertical transport of convective clouds was accomplished by subcloud-scale drafts rather than by the clouds themselves. These small-scale drafts were idealized and regarded as the fundamental agents of the convective transport. The input to the idealized model of subcloud-scale updrafts and downdrafts is the one-dimensional arrays of temperature and mixing ratio as a function of pressure, and the output is the tendency of potential temperature and the tendency of mixing ratio as well as the rate of convective precipitation.
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