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1999年6月下旬长江中下游梅雨锋低涡扰动的结构研究
引用本文:高坤,徐亚梅.1999年6月下旬长江中下游梅雨锋低涡扰动的结构研究[J].大气科学,2001,25(6):740-756.
作者姓名:高坤  徐亚梅
作者单位:浙江大学地球科学系,杭州 310028
基金项目:国家重点基础研究发展规划项目G1998040907和国家自然科学基金资助项目40075009共同资助
摘    要:1999年6月下旬在长江中下游发生长达10天之久的连续性暴雨,作者对其进行了全程中尺度四维同化数值模拟,利用时空高分辨的模式输出,对梅雨锋上与强降水密切相关的5个低涡的活动特点和四维结构进行了综合分析:识别和追踪每个低涡的活动路径,分析其主要特征的垂直结构、水平分布和时间演变,并通过轨迹和气块物理属性个别变化的计算,揭示构成低涡的三股气流,分析低涡区水汽及冷空气来源和湿斜压锋区的形成.

关 键 词:梅雨锋    低涡    中尺度数值模拟    四维同化    四维结构

A Simulation Study of Structure of Mesovortexes along Meiyu Front during 22~ 30 June 1999
Gao Kun and Xu Yamei.A Simulation Study of Structure of Mesovortexes along Meiyu Front during 22~ 30 June 1999[J].Chinese Journal of Atmospheric Sciences,2001,25(6):740-756.
Authors:Gao Kun and Xu Yamei
Abstract:A simulation of the heavy rainfall process along Meiyu front during 22~ 30 June l999 is conducted using the NCAR/ PSU mesoscale model with a four-dimensional data assimilation. It re- produces reasonably well five mesovortexes along the Meiyu front responsible for intensive precipita- tion. The model output of high temporal and spatial resolution is used to analyze the evolution and four-dimensional structure of the vortexes. The movements of the vortexes are traced. The vertical structure, horizontal distribution and time variation of thermodynamic features of the vortexes are in- vestigated. The airflow structure, the origin of moisture and cold air and the formation of moisture baroclinic front in the vortexes are examined by the analyses of trajectory and thermodynamic proper- ties along trajectories.
Keywords:vortex  Meiyu front  mesoscale simulation  four-dimensional data assimilation  four-dimensional structure
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