摘要
利用我国CINRAD/SA多普勒雷达资料与中尺度模式ARPS的资料分析系统ADAS,对初始场进行调整,然后利用高分辨率的中尺度模式WRF对2003年7月4—5日的暴雨过程进行了数值模拟,在模拟结果可信的前提下,对暴雨过程中的中尺度对流系统(MCS)的结构及演变过程进行了分析。表明:多普勒雷达资料有助于提高暴雨模拟的精确度,利用其对中尺度系统进行高分辨率数值模拟,可以进一步认识中尺度系统的细致结构及演变情况;在中-β对流系统发展的过程中,大尺度环境场的有利条件可以对其发展起到促进作用,但具有中尺度特征的水汽条件、上升运动等因素也会起到关键的作用;中-β对流系统中可以同时有一支或多支的上升气流支出现,与降水有密切关系;2003年7月4—5日的两个中-β对流系统在发展过程中有从低空向高空移动的现象,即在发展初期,系统的中心位于低空,而在其旺盛时期则移至高空。
CINRAD/SA Doppler radar data and ARPS data analysis system（ADAS） were used to adjust the initial field. Then the adjusted initial field was used as initial field for the mesoscale model WRF（The Weather Research and Forecasting Model） to simulate a rainstorm process which occurred on 4--5 July 2003. Then the creditable simulated results were used for analysis of mesoscale convective systems. The analysis results show that Doppler radar data are helpful for the accuracy of simulated heavy rainfall and in turn the high resolution simulation is helpful for the analysis of the structure and evolvement of mesoscale systems. Large scale background is helpful for the -β convective system, but vapor and ascending movement have strong impact on the development of mesoscale systems. The - β convective system has one or more branches of ascending movement, which is related with the rainfall. Two - β convective systems developed during the process of rainfall and the centres of the systems were moving from low to high level during their development.
出处
《热带气象学报》
CSCD
北大核心
2009年第4期427-434,共8页
Journal of Tropical Meteorology
基金
国家自然科学基金项目(40405008
40620120437)
国家重点基础研究发展规划项目(2004CB418301)共同资助
关键词
雷达资料同化
数值模拟
中尺度对流系统
演变过程
radar data assimilation
numerical simulation
mesoscale convective system
process of evolvement
