EC-thin资料在低槽冷锋类降水过程人工增雨潜力区识别中的应用

选取8次冀中南地区低槽冷锋类降水过程，基于实况资料、微波辐射计资料、毫米波测云仪资料，利用EC-thin模式资料，分析研究EC-thin资料在人工增雨潜力区识别中的应用。结果表明：低槽冷锋类降水过程的共同特征为中高层30°—50°N、100°—120°E低槽东移，地面冷锋以西北路径或偏西路径南下影响冀中南地区；无论平原还是山区，低云量、气柱总含水量、大气可降水量、850 hPa比湿总体上呈现随降雨量增大而增大的趋势；当冀中南地区受低槽冷锋类天气系统影响时，在平原地区，当低云量、气柱总含水量、大气可降水量、850 hPa比湿预报平均值分别为6成、31 kg·m^-2、37 kg·m^-2、6 g·kg^-1以上时可进行人工增雨作业；在山区，当低云量、气柱总含水量、大气可降水量、850 hPa比湿预报平均值分别为5成、21 kg·m^-2、29 kg·m^-2、4 g·kg^-1以上时可进行人工增雨作业；此外最佳人工增雨阶段为各物理量值达到最大并开始减小阶段。

The application of EC-thin data in the identification of the potential area of artificial precipitation enhancement in the low trough cold front precipitation process

Based on eight precipitation processes of low trough cold front in central-south Hebei,the actual observational data,microwave radiometer data,millimeter-wave cloud instrument data,and the EC-thin model data were used to investigate the application of EC-thin data in the identification of potential area of the artificial precipitation enhancement(APE).Results show that the common features of low trough cold front precipitation process are that the low trough moves eastward between middle and high level(30°-50°N,100°-120°E)and the surface cold front affects central-south Hebei province along the path of northwest or west.No matter whether it is at plain or in mountainous area,low cloud cover(LC),total moisture content of gas column(TMC),atmospheric precipitation(AP)and specific humidity of 850 hPa(SH)generally increase with the increase of rainfall.When the centralsouth Hebei region is affected by the low trough cold front weather system,at the plain area,APE can be carried out when LC,TMC,AP,and the forecasted SH are above 60%,31 kg·m^-2,37 kg·m^-2,and 6 g·kg^-1,respectively.Whereas,in mountainous areas,APE can be carried out when LC,TMC,AP,and the forecasted SH are above50%,21 kg·m^-2,29 kg·m^-2,and 4 g·kg^-1,respectively.In addition,the optimum APE stage is the moment at which the physical values start to decrease from the maximum.