大气科学学报2012，Vol.35Issue(3)：350-363,14.
云滴数浓度影响混合型层状云降水的数值模拟
Numerical simulation of impact of cloud droplet number concentration on precipitation from mixed stratiform and convective clouds
摘要
Abstract
The Morrison＇s double-moment microphysics scheme is incorporated into the mesoscale mod- el WRF V2. 2 to simulate the weather process of snow and rain from 00：00 UTC 25 to 12：00 UTC 29 January 2008 in the southem China. Based on the correct simulation of the weather evolvement, the sen-sitivity experiments are used to research the impact of cloud droplet number concentration on accumula-ted precipitation in the microphysics schemes, showing that the impact is complicated and nonlinear. The microphysics properties in the weather process are analyzed in detail. The evolution of each hydromete-or class is analyzed to find out the effect of cloud droplet number concentration increase on the warm cloud and cold cloud precipitation processes. Results indicate that the higher cloud droplet number con-centration is, the higher cloud water mixing ratio is, and the smaller cloud droplet size is. In addition, the response of rain droplet to cloud droplet number concentration is opposite to the response of cloud drop-let. The higher cloud droplet number concentration is, the lower rain droplet number concentration is, and the lower rain water mixing ratio is, which leads to the warm cloud precipitation to be inhibited. Be-cause of the increase of cloud droplet number concentration, the number concentration of ice crystal and snow have no obvious change. However, the mixing ratio of ice crystal and snow becomes higher as the cloud droplet number concentration increases, so the cold cloud precipitation is enhanced. This case is simulated by using different cloud droplet number concentration, the difference of total precipitations is less than 1%. In general, the precipitation decreases when the cloud droplet number concentration in-creases. The proportion of decrease of warm cloud precipitation is much higher than that of increase of cold cloud precipitation. However, in this case, the dominant process is cold cloud precipitation. The ab-solute values of decreased and increased precipitations are similar and of the same order of magnitude. The result of their counteraction is that the value of total simulated precipitation has no obvious change when the cloud droplet concentration increases.关键词
云滴数浓度/混合型层状云/降水Key words
cloud droplet number concentration/mixed stratiform and convective clouds/precipitation分类
天文与地球科学引用本文复制引用
杨正卿,银燕,刘聪,周毓荃..云滴数浓度影响混合型层状云降水的数值模拟[J].大气科学学报,2012,35(3):350-363,14.基金项目
科技部公益性行业（气象）科研专项（GYHY（QX）200706036） （）
国家科技支撑计划课题 （）
江苏省“333人才工程”项目 （）
