一次华南强飑线过程的数值模拟分析  

Numerical Simulation and Analysis on a Strong Squall Line in South China

作　　者：陈业国 农孟松 黄海洪 沈桐立[2] 

机构地区：[1]广西壮族自治区气象台,南宁530022 [2]南京信息工程大学

出　　处：《气象》2009年第9期29-37,131,共10页Meteorological Monthly

基　　金：广西自然科学基金项目"桂科攻0632006-1D";"桂科攻0816006-9";广西气象局气象科学研究项目"桂气科200709"联合资助

摘　　要：采用高分辨率中尺度数值模式WRF对2007年4月17日华南强飑线过程进行数值模拟,并利用数值模拟结果对强飑线过程进行诊断分析,探讨其触发和维持机制。结果表明,低层中尺度辐合线及切变线是本次飑线过程主要的触发系统和重要的维持机制之一,干侵入和对流性不稳定以及低空辐合高空辐散对飑线的发展和维持有着重要的作用。此外,WRF模式能成功地模拟出本次飑线过程的β中尺度结构特征,表明该模式对强对流天气系统有一定的模拟能力。Using the high-resolution mesoscale model WRF, a strong squall line process on April 17, 2007 in South China was simulated. The numerical simulation results were used to make the diagnostic analysis on the strong squall line process, and to explore its trigger and maintenance mechanism. The results show that low level mesoscale convergence line and shear line are one of the main trigger systems of this squall line process and one of the important maintenance mechanisms. And also the dry invasion and convective instability, and convergence and divergence from bottom to top play an important role in the development and maintenance of the squall line. In addition, meso-β scale structure characteristics of the strong squall line process are successfully simulated, indicating that the WRF model has a certain simulation capability of strong convective weather systems.

关 键 词：飑线 Β中尺度 数值模拟 诊断分析 

分 类 号：P458[天文地球—大气科学及气象学] TP391.7[自动化与计算机技术—计算机应用技术]