一次暴雨天气中云微物理属性的垂直分布特征

Vertical Distribution Characteristic of Microphysical Properties in Clouds during Rainstorm Weather

通过云微观物理属性垂直结构的分析,对了解降水形成机制和提高人工增水效率具有重要意义。以2007年7月9日至10日天山山脉一次暴雨过程为例,利用CloudSat卫星2B-CWC-RO数据集提供的冰粒子等效半径(IER)、水粒子等效半径(LER)、冰水含量(IWC)、液态水含量(LWC),对暴雨过程中云微观物理属性的分析表明,在暴雨过程中IER、LER、IWC、LWC的平均值分别为29.5 μm、13.9 μm、74.3 mg/m3、138.8 mg/m3。四个微物理量在低值段出现频率最高,中值段和高值段出现频率较少。在垂直高度上四个微物理量随高度呈单峰分布,在云层上部8~10 km出现较多,出现频率占整个云层的1/3。

It is significant for understanding of precipitation formation mechanism and increasing the effi-ciency of artificially enhancing precipitation by analyzing the cloud microphysical properties in vertical structure. Taking the rainstorm from July 9th to 10th in 2007 over Tianshan Mountain as an example, by use of the data of ice particle equivalent radius (IER), water particle equivalent ra-dius (LER), ice water content (IWC), and liquid water content (LWC) obtained from CloudSat satellite, 2B-CLDCLASS dataset and 2B-CWC-RVOD dataset, through the analysis of cloud microphysical properties, it shows that the average values of IER, LER, IWC, LWC are respectively 29.5 μm, 13.9 μm, 74.3 mg/m3, 138.8 mg/m3. The occurrence frequency of the low value section of these four microphysical parameters is higher while that of the moderate and high are lower. These four mi-crophysical parameters show single-peak distribution in vertical height and its occurrence fre-quency is much higher in 8~10 km above the cloud that accounts for 1/3 of all.