The bulk properties of tropical cloud clusters, such as the vertical mass flux, the excess temperature, and, moisture and the liquid water content of the clouds, are determined from a combination of 1) the observed large-scale heat and moisture budqets overan are covering the cloud cluster, and 2) a model of a cumulus .ensemble which exchanges mass hecat, water vap o r an&d'liquid water with the environment through entrainnfent and detrainment. The method also !rovid6s ' understanding of how the environmental air is heated and moistened by the cumulus convection. An' estimat6 of the average cloudi cluster properties and the :heat and moisture balance of the environment, obtained from 1956 Marshall Islands data, is presented. (NASA-CR-132871) DETERMINATION OF BULK N74-12151 PROPERTIES OF TROPICAL CLOUD CLUSTERS FROM .LARGE SCALE HEAT AND MOISTURE BUDGETS, APPENDIX B (California Univ.) Uncl 33 p HC $
The large-scale budget of vorticity over the Marshall Islands area is reexamined based on wind data during the period April-July 1956. Efforts are made to obtain accurate estimates of the horizontal advection and twisting terms in the vorticity equation. The mean vertical profile of the budget residual for disturbed conditions shows a large apparent source of positive vorticity in the upper troposphere and a sink near the surface. However, this mean profile is more complicated than those previously obtained for this area. The mean vorticity budget for undisturbed cases is characterized by a large local time change which is nearly compensated by the horizontal advection of absolute vorticity.
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