【摘要】 利用常规的探空和地面资料以及NCEP/NCAR全球再分析资料,对9711号台风温妮和0509号台风麦莎的变性过程和影响河北暴雨过程的湿位涡场进行了诊断分析。结果表明:温妮变性再加强过程是一个温带气旋强烈发展的过程,主要与高层湿位涡扰动下传、热带气旋低压环流两者之间的相互作用有关。而麦莎变性过程中,没有高层湿位涡扰动下传和热带气旋低压环流之间的相互作用过程,无再加强过程。对流层中低层MPV1<0、MPV2>0区域对应暴雨区,对此类暴雨具有较好的指示意义;对流层高层高值湿位涡下传,有利于位势不稳定能量的储存和释放,使降水增幅。更多还原

【Abstract】 With conventional meteorological data as well as NCEP/NCAR reanalysis data,the processes of the typhoon 9711 and the typhoon Matsa(0509)are diagnosed and compared.The result indicates that the re-strengthening of the typhoon 9711 after its denaturing was due to intense development of a frontal cyclone,which was incarnated by downwards moving of the upper level potiential voticity,the tropical low pressure circulation and the low-level front.But in the process of the denaturing of the typhoon Matsa,there was no low-level front,and the atmospheric slanting piezotropy was weaker.So the mutual influence of downwards moving of the upper level potiential voticity,the tropical low-pressure circulation and the low-level front did not exist.MPV1<0 and MPV2>0 were characteristic storm rainfall area,which is a good denotation of this kind of rainstorm.Downwards moving of the upper level potiential voticity is advantageous to releasing of the unstable energy,and causing the increasing precipitation.更多还原