Size Distribution of Raindrops from Layer Type Clouds in Tropics

[摘要] A preliminary study of the size distribution of raindrops from layer type precipitation in tropics has been made. The large deviations in the size distribution which have been ignored by the past workers, in their attempt to develop an emperical relationship between the dropsize and intensity of rainfall, have been examined. The large deviations from ‘Marshall-Palmer distribution’ in the observed spectral distribution of drops at the ground level are explained in terms of the modification the dropsize spectrum undergoes, in the intervening space between the level of origin of raindrops and ground due to the following factors:(a) Growth of raindrops by accretion with cloud droplets, (b) Differential rates of evaporation of raindrops of different sizes in falling from cloud to ground and(c) Coalescence between raindrops of different sizes during their fall from cloud to ground.

[学科分类] 大气科学