福建“98.6”中尺度强降水红外云图特征量统计分析  

A STATISTICAL ANALYSIS OF THE CHARACTERISTIC VALUES OF IR. CLOUD IMAGE DURING MESOSCALE HEAVY PRECIPITATION IN JUNE 1998 IN FUJIAN

作　　者：林祥明[1] 林长城[1] 张长安[1] 谢怡芳[2] 

机构地区：[1]福建省气象科学研究所,福建福州350001 [2]福建省气象局,福建福州350001

出　　处：《热带气象学报》2002年第3期253-261,共9页Journal of Tropical Meteorology

基　　金：福建省气象局气象科学技术研究课题(1998)

摘　　要：对福建省“98.6 中尺度强降水红外云图特征量进行统计分析。结果表明,福建省6月份中尺度对流云团出现强降水(某站小时雨量≥8 mm)机率达到70 %,云顶温度TBB平均值为-58 ℃,冷层(TBB≤-44 ℃)云温面积占有率TBZ为42 %,可以利用冷层云温面积占有率绝对增量ΔTBZ及云温档次号TBBi 作为影响因子估测地面降水。The characteristic values derived from IR. cloud image during mesoscale heavy precipitation taking place in June 1998 in Fujian province were analyzed by using statistical method. The results indicate that the frequency of heavy precipitation in mesoscale connective system in June in Fujian is 70 %, and hourly rainfall amount at a single station was equal to or more than 8mm; and the average value of cloud top temperature(TBB) was -58 ℃; and the value of ratio (TBZ) of amount of pixels in which TBB is below -44 ℃ was 42 % to total. These characteristic values (e.g.TBB, TBZ, ΔTBZ) may be used as forecasting factors to estimate surface rainfall amount .

关 键 词：福建 红外云图 特征量 强降水 统计分析 中尺度 对流云团 云顶温度 温度梯度 

分 类 号：P458.121[天文地球—大气科学及气象学]