【作者】 狄利华； 姚学祥； 解以扬； 寿绍文；

【Author】 DI Li-hua~(1,2) YAO Xue-xiang~2 XIE Yi-yang~2 SHOU Shao-wen~1 LV Jiang-jin~2 MENG Dong-mei~2 (1.School of Atmospheric Sciences,NUIST,Nanjing 210044,China; 2.Tianjin Municipal Meteorological Bureau,Tianjin 300074,China)

【机构】 衢州市气象局； 天津市气象局； 南京信息工程大学大气科学学院；

【摘要】 利用地面和高空的实况观测资料、NCEP 再分析资料以及 FY-2C 卫星云图资料,并通过中尺度 Barnes 滤波和物理量诊断分析,对台风“麦莎”变性过程进行研究。采用非静力平衡的中尺度模式 MM5(V3．7)对“麦莎”北上变性,影响京津地区降水的全过程进行了60h 模拟。结果表明：“麦莎”登陆北上过程中,两北侧冷空气先随着“麦莎”环流由北向南旋转,尔后冷空气又从台风低压中心的偏南侧向北侵入,逐步侵入“麦莎”暖心结构；且在垂直方向上,对流层中高层不断有系统性的冷空气倾斜向下补充,冷空气从对流层低层侵入台风环流,最终使“麦莎”变性。在接近华北地区时,“爱莎”云系发生分裂,偏西侧云系的出现和发展与低层850hPa 流场上中尺度辐合线的产生密切相关,其中冷空气的作用显著。更多还原

【Abstract】 By employing the actual observations of upper air and surface,NCEP reanalysis data and FY-2C satellite cloud image,by using the methods of mesoscale Barnes filtering and physical diagnosis,typhoon MATSA is analyzed.Using the Penn State-NCAR nonhydrostatic mesoscale model(MM5),the evolution of MATSA after landfall and the process of Tianjin and Beijing’s precipitation is simulated for 6Oh.The results show that during the process of MATSA making the landfall and going northward,cold air of northwest rotates along with MATSA circulation from north to south first,and then goes northward from the south of the center of typhoon low,intrudes into the warm center of MATSA by degrees,also in the vertical direction,there is supplement of the systematic cold air from middle and high level of the troposphere,the cold air intrudes into the typhoon circumfluence from the lower level of the troposphere,inducing extratropical transition at last.The cloud system of MATSA divide into west part and east one,when close to North China,and the appearance of the west cloud is connected with the emergence of mesoscale convergence line at 850hPa stream field closely,while the role of cold air is important.更多还原