呼和浩特春季连续两次降水的对比分析

The Comparative Analysis of Twice Continuous Precipitation in Spring in Hohhot

2006年5月8日和5月11—12日呼和浩特地区连续出现了两次关键性的中雨、局部大雨的天气过程。两次降水过后,连旱两个月的呼和浩特地区彻底解除了旱情。为了弄清楚间隔2d出现的两场较大降水的物理原因,利用MICAPS资料、自动站资料等对这两次过程进行了初步分析。分析表明,源源不断的大、中尺度水汽输送是这两次降水的主要原因。而大、中尺度急流间的风向辐合加强了垂直上升运动,这是形成两次降水的关键所在。另外,通过分析发现5月8日的降水为混合性降水,而5月11—12日的降水则为稳定性降水。

The weather process of twice pivotal moderate rain and local heavy rain,which relieved bimestrial drought,happened on May 8 and 11 to 12,2006.Using MICAPS data and automatic observational data,the twice precipitation process were analyzed for finding out the physical cause of the twice pivotal precipitation.The results showed that the water vapor transport from large scale and mesoscale were the main reason for twice pivotal precipitation.The wind direction convergence of large scale and mesoscale riffle strengthened vertical ascending motion,which was the key to twice pivotal precipitation.In addition,the analysis found that on May 8 the precipitation was mixed precipitation,and on May 11 to 12 the precipitation was steady precipitation.