摘要
利用常规探测资料、NCEP10?10再分析资料、结合江苏省自动气象站观测资料、追踪南京多普勒天气雷达观测资料、垂直风廓线产品以及FY2C红外卫星云图分析发现:在这次暴雨过程中,对流不稳定能量、700hPaθse高能舌的形成和锋区的分布是揭示强雷雨活动的重要特征。在θse的剖面图上,θse高能舌跃过500hPa,是判断盛夏季节强雷雨结束的重要信号。新对流与MCS结合会触发新的MCS迅速发展增强。相对于对流层的平均风而言,新的对流在MCS的上风方发展,MCS将逐渐东移。利用多普勒雷达垂直风廓线产品能很好地追踪冷空气的活动。另外,当自动气象站地面风场产生扰动形成气旋性波动时,雨团将会在气旋性区域内发展并作相应的移动,这对短时临近落区预报有指示意义。
Based on the conventional meteorological observation, NCEP reanalyzed, automatic weather station, Doppler radar, VWP, and the infrared satellite data, a heavy rainfall was analyzed in the west of Jiangsu on July 20, 2006. The Results indicated that the high-energy tongue, the fronts of unstable convective energy and θse at 700hPa level were the important features in this strong thunderstorm. Seasonal strong thunderstorm was going to be finished when the highenergy tongue of θ se had leapt 500hPa. New MCS is triggered by the combination of new convection and MCS. New MCS will move towards its developing position compared with the average wind direction in the troposphere.It was better to pursue mobile air by VWP. In the other hand, if the wind directions in automatic weather station was bended tend to be cyclonic curve, the rain mass would develop and move accordingly in the cyclonic area. It was significant to the short time forecast.
出处
《中国西部科技》
2008年第3期12-15,20,共5页
Science and Technology of West China
关键词
强雷雨
新对流
移向
strong thunderstorm
new MCS
move
