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气象:2007,33(11):49-57
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0604号强热带风暴碧利斯对云南的影响及维持机制
(1.云南省气象台,昆明 650034;2.云南省气象局;3.云南省雷电中心)
The Maintaining Mechanism of 0604 Severe Tropical Storm Bilis and It’s Influence on Yunnan Province
(1.Yunnan Meteorological Observatory, Kunming 650034;2.Monitoring Network Department, Yunnan Meteorological Bureau;3.Thunder Center of Yunnan Province)
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投稿时间:2007-03-12    修订日期:2007-09-13
中文摘要: 应用MICAPS资料及FY-2C卫星云图,通过天气分析与诊断分析,探讨了0604号强热带风暴碧 利斯路径西偏南的原因,对造成云南的暴雨过程进行了分析并研究了这次登陆强热带风暴长 久维持不消的物理机制。结果表明:黄海副高南落加强西伸与大陆高压合并加强,高压南侧 东北风的牵引作用,是“碧利斯”路径西偏南的主要原因;“碧利斯”造成的云南强降水落 区分布在热带低压倒槽前东北风急流区内水汽辐合中心区域,并且与700hPa湿〖WTHX〗Q〖W TBZ〗矢量辐合区对应较好,热带低压影响期间,大气曾具有湿中性垂直运动结构
Abstract:MICAPS data was used to research the reasons of the path’s deflecting south we stwards of 0604 severe tropical storm by synoptic and diagnosis analysis, and by the analysis on the storm rainfall caused by the severe tropical storm in Yunna n Province. The physical mechanism of the maintenance of the tropical storm’s s trength after landfall is also discussed. The result indi cates that the main reason of the path’s deflecting south westwards of Bilis w as the leading of northeast wind at the south of high which was formed by the me rging of continental high and the Huanghai subtropical high after its moving sou thwards and strengthening eastwards. Heavy precipitation caused by Bilis happene d at the center of water vapor convergence area which located in the northeast j et region on the front of inverted trough of tropical depression, and the locati on of the precipitation is corresponding better to the wet Q vector convergence area. During the period when the influence of tropical depression existed, the a tmosphere had wet neutral vertical moving structure and the situation was benefi cial for the growth of storm rainfall system. The interaction between Bilis and severe southwest jet for a long time after the landfall of Bilis was the main re ason for its maintenance. With the fading of southwest jet, the precipitation fi nished completely. The southwest monsoon cloud’s getting into the tropical depr ession strengthened the input of water vapor and energy, which was another impor tant reason that maintained the tropical depression and caused the heavy precipi tation. The South Asia high strengthened during active period of the tropical de pression, and the strengthening of divergence field on the upper level, the exis tence of lower level convergence and upper level divergence, and the maintenance of vertical positive vorticity which was related with southwest jet were benefi cial for the maintaining of the tropical depression and the movement tendency of the tropical depression to upper severe divergence area after its landfall.
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鲁亚斌,普贵明,解明恩,张腾飞,2007.0604号强热带风暴碧利斯对云南的影响及维持机制[J].气象,33(11):49-57.
Lu Yabin,Pu Guiming,Xie Mingen,Zhang Tengfei,2007.The Maintaining Mechanism of 0604 Severe Tropical Storm Bilis and It’s Influence on Yunnan Province[J].Meteor Mon,33(11):49-57.