基于通道差异及云指数法的西藏雷暴卫星云图特征分析  

Characteristic Analysis on Satellite Image of Thunderstorm in Tibet Based on Different Channel and Cloud Index Methods

作　　者：朱克云[1] 张杰[2] 任景轩[1,3] 张琪[1] 孙荣[1] 

机构地区：[1]成都信息工程学院大气科学学院 [2]成都军区空军气象中心 [3]中国人民解放军77171部队

出　　处：《高原气象》2011年第6期1633-1639,共7页Plateau Meteorology

基　　金：公益性行业(气象)科研专项(GYHY200906006);西藏气象局重点研究项目(2009)共同资助

摘　　要：利用2006-2008年间我国风云-2C(FY-2C)卫星资料和西藏39个测站的雷暴观测资料,采用通道差异及云指数法对西藏地区雷暴在FY-2C云图上的特征进行了分析。结果表明,西藏不同地区雷暴在FY-2C卫星不同通道云图上存在差异。总体而言,雷暴发生时,雷暴云的红外云顶亮温值一般介于-63～-13℃之间,较东南沿海地区雷暴云顶亮温偏高。水汽亮温值大多数在-32℃左右,次中心在-48℃以下。红外分裂窗通道亮温差主要在-5～5℃之间。总雷暴与拉萨、日喀则和那曲站雷暴的红外水汽通道亮温差分布特征一致,峰值位于0℃附近且呈准正态分布,而隆子、当雄、安多和索县站的亮温差峰值主要位于亮温差较小的正值区。雷暴FYCDI云指数和FYC_TS云指数高值区间均在零值附近,与前者比较,后者具有反映夜间雷暴云团特征的优势。Based on the FY-2C satellite,China and thunderstorm data from 2006 to 2008,thunderstorm characteristics in Tibet Plateau were analyzed by channel difference and cloud index methods.The researched results show that thunderstorms have different characteristics in different regions in Tibet.But as a whole,the IR1 TBB often happen from-63 ℃ to-13 ℃,and is higher than that in southeast of China.The IR3 bright temperature has a high frequency around-32 ℃.As the TBB difference between IR1 and IR2,most of them are from-5 ℃ to 5 ℃.The TBB difference between IR1 and IR3 has a quasi-normal distribution at Lhasa,Shigatse,Naqu and Tibet region,but the differences are little and positive at the other regions.The value of FYCDI and FYC_TS are close to zero,and the latter has a superiority in indicating the characteristic of thunderstorm at nighttime.

关 键 词：西藏 雷暴 中国FY-2C卫星 通道差异 卫星云指数 

分 类 号：P405[天文地球—大气科学及气象学]