摘要
利用ＭＭ５模式分别模拟了台风、中纬度西风槽对台风远距离槽前降水的影响。试验结果表明，（１）台风的强度影响了台风东侧东南急流向中纬度槽前的水汽输送。低层水汽输送，造成中纬度暴雨区强水汽辐合和不稳定能量积聚，故槽前降雨的强度与其南方台风东侧的水汽输送有着相当密切的关系。（２）中纬度西风槽提供了有利于台风远距离降水的大尺度背景场。西风槽的存在，有利于垂直运动的发展和维持，有利于降雨的产生和发展。模拟结果表明，槽的加强和减弱将会相应地造成中纬度暴雨区的加强和减弱。
With non-hydrostatic meso-scale model MMS, the impacts of typhoon and westerly trough on the rainfall occurring in front of westerly trough far from the typhoon are analyzed in this paper. The results show that typhoon intensity can have influence on the water vapor transport to mid-latitude area by the southeasterly jet on the east of the typhoon. Low--level water vapor transport may result in strong water vapor convergence and unstable energy accumulation in the mid-latitude rainfall area. Consequently, the rainfall intensity in front of the westerly trough has close relationship with the water vapor transport to the east of the typhoon. Additionally, westerly trough provides a large-scale background that can benefit the occurring of mid-latitude rainfall. The westerly trough can contribute to the development and maintaining of vertical motion and thus benefit the occurring and intensification of the heavy rains. Furthermore, the simulation results also show that the intensity of westerly trough can affect the intensity of the heavy rainfalls of the mid--latitude area.
出处
《大气科学》
CSCD
北大核心
2000年第5期669-675,共7页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金!49775264
关键词
暴雨
中低纬度环流系统
相互作用
模拟
westerly trough, typhoon
enhancement of typhoon-caused heavy rain
