where N(a) is the scatterer size distribution with lower and upper radius limits a, and a2, respectively. Rensch and Long (30) have taken the Laws-Parsons rain particle distribution and calculated )3ex and pa as functions of the rainfall rate, R (mm/h). For the present study, we have employed the Marshall-Palmer distribution given by N(D) = Noexp(-AD) , (9) where D is the drop diameter (mm), N(D) dD is the number of drops per unit volume in the size increment from D to D + dD (m 3 mm '), and A is a parameter which depends upon the type and intensity of precipitation (mm-1). Three separate distributions, taken from the work of Joss et al. (45) and representative of different types of precipitation, were used in the numerical calculations. Fig. 8. Calculated (this work, 30) and measured (29) extinction and absorption coefficients for rain.
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