1999年6月下旬长江中下游梅雨锋低涡扰动的结构研究  

A Simulation Study of Structure of Mesovortexes along Meiyu Front during 22～30 June l999

作　　者：高坤[1] 徐亚梅[1] 

机构地区：[1]浙江大学地球科学系,杭州310028

出　　处：《大气科学》2001年第6期740-756,共17页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展规划项目G1998040907;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继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。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.

关 键 词：梅雨锋 低涡 中尺度数值模拟 四维同化 四维结构 1999年 冷空气 水汽 

分 类 号：P426.62[天文地球—大气科学及气象学]