气旋冷暖区暴雨对比分析

Comparison of Heavy Rain in Cool/Warm-section of Cyclone

利用常规资料及MM5的模拟分析结果,对山东两次气旋影响产生不同暴雨落区的天气过程进行了对比分析。研究了气旋冷区和暖区暴雨的高低空系统配置、相当位温的水平及垂直分布、垂直运动及散度的垂直分布。结果表明:冷区暴雨具有明显后倾结构和较强斜压锋区,暴雨出现在850hPaθe暖湿舌后部密集区,其垂直运动沿锋面大范围抬升,动力条件更强;而暖区暴雨高低空系统重合,暴雨出现在850hPaθe暖湿舌里。这些特征可为暴雨落区预报提供参考。

Using meteorological data and MM5 numerical simulation, the characteristics are analyzed for two heavy rain events caused by cyclone in Shandong Province. The upper-and low-layer system, horizontal and vertical distribution of equivalent potential temperature, vertical motion, and divergence are studied for the two heavy rains. The results show that in cool section heavy rain occurred behind the warm and moist tongue of 850hPa, it has apparent back slantwise structure, strongly baroclinic frontal zone, and stronger dynamic conditions; but in warm section heavy rain occurred in the warm and moist tongue of 850hPa. It provides an excellent reference for forecasting heavy rain.