基于RS92探空资料的云垂直结构判定及其分布研究

Determination of Cloud Vertical Structure and Analysis of Its Distribution based on RS92 Radiosonde Data

基于已有的云垂直结构判断方法,结合高垂直分辨探空资料,对相对湿度阈值法进行相应改进,并利用德比尔特地区2007年全年的RS92探空资料,对该地区的云垂直结构进行判定,同时对该地区云出现频率及云垂直结构参数的分布特征进行统计分析。结果表明:利用改进相对湿度阈值法来分析高分辨探空资料的云垂直结构是可行的;该地区的云层,以单层云和双层云为主,且单层云出现频率呈"冬高夏低"分布,双层云则与其相反;其所有云平均云底高、云顶高、云厚度、顶层云顶高的出现频率,随高度的增加而减小。

Based on the being method of cloud vertical structure determination,combined with high-vertical-resolution radiosonde data,we modify the method of relative humidity threshold.And we determine the cloud vertical structure using the RS92 radiosonde data in De Bilt region in 2007,and analyze the occurrence frequency and the vertical distribution characteristic of cloud.The result shows that it is feasible to analyze the high-resolution radiosonde data of cloud vertical structure using the improved relative humidity threshold method.There are mainly single-layered and two-layered cloud in this region,and the occurrence frequency of signal-layered cloud shows the characteristic of ＂higher in summer and lower in winter＂,the double-layered cloud is the opposite.The occurrence frequency of the mean cloud base height,cloud top height,cloud thickness and the highest cloud top height for all cloud increases with the height.