Further Analysis and Parameterization of Cloud MicrophysicalProcesses

云物理学中的“暖雨”是指在没有冰晶的情况下，云中降水的发展。云滴主要是通过合并形成的。在自然界中观测到的液滴尺寸谱既有双峰分布，也有三峰分布。布朗教授通过模拟液滴碰撞时的聚结和破裂过程，成功地解释了这种分布的原因。在此资助下，Brown教授将进一步考虑蒸发和初始液滴尺寸光谱在光谱演变中的影响。由于对流云模型经常不能明确地考虑复杂的合并和碰撞引起的破裂，因此Brown教授的工作变得更加重要。

"Warm rain" in cloud physics refers to the development of precipitation in clouds in the absence of ice crystals. Cloud droplets grown primarily through coalescence. The droplet size spectra observed in nature have shown both bi-modal and tri-modal distributions. Professor Brown has successfully explained the cause of such distributions by modeling both coalescence and the breakup process when droplets collide. Under this grant Professor Brown will further consider the effects of evaporation and the initial droplet size spectra in the evolution of the spectra. Since convective cloud models frequently cannot explicitly take into consideration the complex coalescence and collision-induced breakup, a refined parameterization, hence professor Brown's work, becomes even more important.