复杂地形对西南低涡生成和移动影响的数值试验分析  

Numerical Experiments Analysis of Impact of Complex Terrain on Generation and Move of Southwest Vortex

作　　者：母灵[1,2] 李国平[1] 

机构地区：[1]成都信息工程学院大气科学学院 [2]中国人民解放军96427部队

出　　处：《成都信息工程学院学报》2013年第3期241-248,共8页Journal of Chengdu University of Information Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB417202);公益性行业(气象)科研专项资助项目(GYHY201206042)

摘　　要：为探讨四川盆地周边复杂地形对西南低涡发生发展以及移动的影响,利用NCEP 1°×1°再分析资料和中尺度非静力平衡模式WRF V3.4.1,对2010年7月16日至18日发生在四川盆地的一次西南低涡暴雨过程进行了再现模拟(控制试验)以及降低盆地周边不同地形高度的3组敏感性试验。结果表明,控制试验模拟出的西南低涡位置和强度与实况基本吻合。秦岭、大巴山山脉对西南低涡的形成不具有决定性影响,但对西南低涡的维持和发展具有非常重要的作用;横断山脉、云贵高原对西南低涡的生成位置、强度以及移动路径均很重要;青藏高原大地形对偏东气流的阻挡而产生的绕流有利于西南低涡的生成,对西南低涡的移动也有重要影响。除西南低涡以外,四川盆地周边地形所产生的一些局地小低涡的现象也值得关注。This objective of this study is to explore the influence of the complex terrain surrounding Sichuan basin on the generation, development and move of southwest vortex, a rainstorm process which occurred during July 16th to 18th, 2010 in Sichuan Basin was caused by a southwest vortex was simulated, on the basis of the NCEP 1° x 1° re- analysis data and mesoscale nonhydrostatic model WRF V3.4.1. Control experiment and three sensitivity experi- ments with different terrain heights were conducted. Simulated result of control experiment consisted of the real situ- ation basically. The results of sensitivity experiments show that the impact of Tsinling and Ta-pa Mountains on southwest vortex formation is insignificant, but it seems very important when it comes to the maintenance and devel- opment of the southwest vortex; and Transverse Mountain Range and Yunnan-Kweichow Plateau would mean a lot to the generation position, intensity and path of southwest vortex. Flow around plateau would form when easterly stream was blocked by the Tibetan Plateau and would have a positive impact on the generation of southwest vortex. What＇s more this kind of flow would play an important role in moving of southwest vortex. Besides the southwest vortex, some small local vortices occurred in or around Sichuan Basin are deserved to be noticed.

关 键 词：气象学 西南低涡 地形 生成 移动 数值试验 

分 类 号：P466[天文地球—大气科学及气象学]