飞机作业区域降水转化率特征

Characteristics of Precipitation Transfer Efficiency of Aircraft Precipitation Enhancement Areas

利用79个气象台站30年的地面水汽压资料,计算整层大气可降水量,结合各站地面降水资料,计算了四川省飞机作业区域的降水转化率,分析了降水转化率的特征及其与雨日的关系。结果表明,飞机作业各区域降水转化率都不高,降水转化率最小的区全年平均7.34%,最大的区全年平均12.29%,实际降水量占空中水汽总含量比例都很小,空中水资源开发前景广阔。降水转化率的时空分布明显不均匀,各气象台站间差异较大,季节差异明显,夏季最大,秋季次之,冬季最小。降水转化率和雨日相关系数为0.571 58。降水转化率和大到暴雨日呈线性增长关系,相关系数为0.825 02。

Based on the ground observational data from 79 meteorological stations during the 30 years,this study calculates the total precipitable water vapor and the precipitation transfer efficiency of the aircraft rainfall enhancement areas in Sichuan Province,and analyzes the characteristics of precipitation transfer efficiency as well as the relationship between it and rainy days.Results indicate that the precipitation transfer efficiency of all the aircraft rainfall enhancement areas is low with the smallest of 7.34% and the biggest of 12.29% in average.The ground rainfall amounts account for very small proportion of the entire precipitable water,thus,the cloud water resources see broad exploitation prospect.The spatial and temporal distribution of precipitation transfer efficiency is obviously uneven,and the precipitation transfer efficiency of all meteorological stations differs very large.Precipitation transfer efficiency varies with seasons obviously with the maximum in summer,and then followed by autumn and at last winter.The correlation coefficient between precipitation transfer efficiency and rainy day is 0.571 58.The precipitation transfer efficiency shows a linear increasing correlation with heavy rainy or rainstorm days with the correlation coefficient of 0.825 02.