台风莫拉克的偏振参量演变分析  

Evolution of Polarimetric Parameters in Typhoon 'Morakot'

作　　者：沈瑾[1] 楚荣忠[1] 赵果[1] 吴宗元[1] 

机构地区：[1]中国科学院寒旱区陆面过程与气候变化重点实验室,中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《高原气象》2011年第3期809-816,共8页Plateau Meteorology

基　　金：公益性行业(气象)科研专项“热带西太平洋观测试验与我国高影响天气可预报性研究”子课题“X波段双偏振多普勒雷达及地面降水加密观测与分析”资助

摘　　要：2009年8月6～10日X波段双线偏振多普勒雷达对200908号台风"莫拉克"(Morakot)进行了观测,根据台风的移动路径和进入雷达观测区域的台风不同部位,分为台风螺旋雨带、台风眼壁和台风后雨带3个部位,针对这3个部位的偏振参量及粒子信息进行了比较分析。结果表明,浅对流普遍存在于台风各个部位;台风各部位均有过冷水和湿雪存在,台风后雨带中还有少量霰粒子和冰雹粒子;且台风融化层特征明显,各部位均存在高ZDR、低ρHV(0)层带和小范围的高KDP层;台风眼区的粒径较其他两个部位粒径偏小;通过偏振参量统计发现ZH、ZDR和ρHV(0)垂直分布特征明显,不同部位差异较大,KDP在不同部位统计特征差异较小。The information of typhoon ＇Morakot＇（200908） were observed by the X-band dual polarization Doppler radar on August 6~10,2009.According to the moving path of the typhoon and different parts of the typhoon access to radar observation area,the observations of typhoon are divided into three parts,namely the spiral rain band region,the eye wall of typhoon and post-typhoon rain band.The changes of polarimetric parameters and spatial distributions of the dominant water particles during all parts of the typhoon are analyzed.The results show that the shallow convection exists in every part of the typhoon.Cold water and wet snow exist in every part of the typhoon and there also has a small amount of graupel and hail particles in post-typhoon rain band.The characteristics of melting layer of typhoon are obvious on the high ZDR,low ρHV（0） layers and high KDP layer exists in all parts of typhoon.The particle size in the eye wall of typhoon is smaller than the other two parts.The statistic results of polarimetric parameter show that the vertical distribution of ZH,ZDR and ρHV（0） are significantly different in three parts,however,the distribution of KDP has not obvious change in the different parts.

关 键 词：莫拉克台风 偏振参量 粒子分类 融化层 

分 类 号：P444[天文地球—大气科学及气象学]