应用拉格朗日方法研究四川盆地暴雨的水汽来源  

STUDY ON THE MOISTURE SOURCE OF RAINSTORMS IN SICHUAN BASIN BY THE LAGRANGIAN METHOD

作　　者：岳俊[1] 李国平[1] 

机构地区：[1]成都信息工程大学大气科学学院,四川成都610225

出　　处：《热带气象学报》2016年第2期256-264,共9页Journal of Tropical Meteorology

基　　金：国家自然科学基金(91337215;41175045);国家重点基础研究发展计划(973计划)项目(2012CB417202);公益性行业(气象)科研专项经费项目(GYHY201206042;GYHY201006014)共同资助

摘　　要：基于拉格朗日方法的轨迹追踪模式HYSPLIT v4.9可用来追踪水汽的来源以及运行轨迹。结合应用拉格朗日方法与欧拉方法,通过分析四川盆地2013年6月29日—7月2日、7月7—11日和7月15—19日三次暴雨过程来研究孟加拉湾地区的水汽通道对四川盆地暴雨的影响。分析结果表明:影响这三次暴雨过程的水汽通道均有多条,但其中最为主要的均为来自孟加拉湾的水汽通道。孟加拉湾水汽输送在低空环流系统的作用下,一部分是直接越过云贵高原输送到四川盆地,另一部分是绕过云贵高原在南海地区与南海水汽以及越赤道水汽在西太副高外围东南气流的作用下一并输送到四川盆地;其中在南亚季风强大的西南气流作用下,孟加拉湾大气河中的水汽主要越过云贵高原输送向四川盆地。同时分析对比了孟加拉湾水汽输送通道与大气河(At—mospheric River)之间的异同点,发现孟加拉湾水汽输送通道与大气河之间存在着一定的相似性。The HYSPLIT v4.9 is a method which is superior in tracing the source and running track of water vapor. Based on Lagrange and Euler methods, this paper analyzed the impact of the water vapor from the Bay of Bengal on three rainstorm processes that happened in Sichuan basin respectively on 29 June to 2 July, 7 to 11 July and 15 to 19 July in 2013. The results are shown as follows： There are many channels that provide water vapor for the three processes but the channel over the Bay of Bengal is the main one. Under the force of low-level circulation field, the water vapor of Bay of Bengal flows to the Sichuan basin through two ways, one running across the Yunnan-Guizhou Plateau and the other going around it and joins with the water vapor from the southern sea and the southeast flow from the periphery of a west Pacific high. Under the influence of South Asian monsoon, the water vapor that reaches the Sichuan basin is mainly through the Yunnan-Guizhou Plateau. Moreover, this paper compared the similarities and differences of Bay of Bengal Channels and a so-cafled atmospheric river, with the outcome revealing that there are some connections between these two concepts.

关 键 词：拉格朗日方法 轨迹追踪 孟加拉湾 水汽输送通道 盆地暴雨 大气河 

分 类 号：P458.121[天文地球—大气科学及气象学]