0604号台风“碧利斯”持久不消及造成云南暴雨成因分析  

Analysis on long subsistence of Typhoon 0604 "Bilis" and the formation of Yunnan rainstorm

作　　者：尤红[1] 王曼[2] 曹中和 赵娜 

机构地区：[1]云南大学大气科学系,云南昆明650091 [2]云南省气象科学研究所,云南昆明650034 [3]云南省玉溪市气象局,云南玉溪653100

出　　处：《台湾海峡》2008年第2期256-261,共6页Journal of Oceanography In Taiwan Strait

基　　金：云南省气象局2006年青年研究基金资助项目

摘　　要：利用常规观测资料和NCEP 1°×1°6h再分析资料对0604号台风"碧利斯"登陆后持久不消及其造成云南暴雨的成因进行分析.其结果表明:两高间强而宽广的辐合带和西南急流增强使台风低压在陆上连续5d不消,副高、西南急流在低压区形成的最大风速中心位置决定台风低压移动方向.此次云南台风暴雨是在台风减弱低压主导作用下,激发强不稳定能量释放、产生强对流,形成利于垂直运动深厚发展伴有强抽吸作用的暴雨动力结构,孟加拉湾水汽源源不断向云南上空输送,经低层强水汽辐合抬升凝结而造成的.影响云南500hPa低压干位涡涡源中心值越大地面降水越强,850hPa干、湿位涡可提前12h预示台风减弱、移动方向的信息.Based on re-analyzed data of NCEP （ 1°×1°,4-times-a-day＇s） and the conventional meteorological data, the causes for long subsistence of typhoon 0604 ＂ Bibs＂ and for Yunnan rainstorm are diagnostically analyzed. It shows that the typhoon depression lasted for five days on land was because of a strong and wide convergence zone between two high pressures, together with the strengthening of southwesterly jet and its movement direction determined by the maximum wind speed by the subtropical high and the southwesterly jet. Yunnan rainstorm was dominated by typhoon depression with fiercely released unstable energy besides the strong convection and southwesterly jet transportation of water vapor over the Bay of Bengal to Yunnan area and convergences and coagulates with the strong low vapor while rising. The larger the value of the 500hPa low pressure dry potential vorticity which influenced Yunnan area, the heavier the rainfall would be. The 850hPa dry and wet potential vorticity might sign the typhoon weakening and its moving direction by 12 hours earlier.

关 键 词：台风低压 暴雨 位涡 副高 西南急流 云南 

分 类 号：P444[天文地球—大气科学及气象学]