全球区域同化预报系统的使用及其数值模拟

Application And Numeric Simulation Of Global Regional Assimilation Prediction System (GRAPES)

介绍了中国气象科学研究院数值预报中心自主开发的GRAPESV2.1数值模式运行步骤,并利用该模式对2005年5月1日06～07时在江西南昌市区出现的30mm/h强降水过程,进行了数值模拟和诊断分析。结果发现,北方干冷空气南下,到达30°N附近后,与南方暖湿空气在南昌市区上空低层形成交汇,促使暖湿空气沿着锋面迅速抬升凝结,触发不稳定能量的释放,是造成南昌强降水产生的主要原因;GRAPES模式能很好地模拟出高低空环流形势场特征和主要天气系统,能提供较准确的高分辨率诊断分析资料。

The running steps about GRAPESV2.1 developed by the Chinese academy of meteorological sciences are presented, and numeric simulation and diagnostic analysis for a heavy precipitation process 30mm per hour from 06 to 07 on May 21, 2005 in Nanchang in Jiangxi is implemented. The result shows as follows： the dry and cold air come from north, and converged with warm and wet air from south in the low level of upper air in Nanchang city, and urged the warm and wet air rising and coagulating quickly, and resulted in the release of unstable energy, it was the primary reason for the heave rainfall in Nanchang city. The simulation that GRAPES mode can be very good produces the height circulation situation characteristic once and main weather system, can offer more accurate high-resolution to diagnose that analyse the materials.