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大气科学  2005 

MM5中新显式云物理方案的建立和数值模拟

DOI: 10.3878/j.issn.1006-9895.2005.04.12

Keywords: MM5,双参数谱演变方案,云凝结核,微物理结构

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Abstract:

在MM5动力框架内,在其中Reisner2方案基础上采用双变参数方案,增加了云水、雨水、雪和霰的数浓度预报方程.云中凝结核CCN的数浓度采用超几何函数表示;云水向雨水的自动转换过程考虑了云滴谱的特征和发展变化对该过程的影响,而不是采用原方案给定阈值的方法描述该过程;对连续碰并方程不再将粒子落速差作为常量提出积分号外,而是直接作为粒子直径函数在积分号内求解,这样处理可以回避使用粒子群的平均落速带来的误差;增加了霰和雪、霰和冰晶的碰并微物理过程.粒子引入Г分布谱函数,对微物理过程采用了与之

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