摘要
利用常规气象资料和赤峰多普勒雷达资料，从环流背景、中尺度分析、温度对数压力蚓和雷达产品演变特征对2011年7月5日赤峰地区一次冰雹天气过程进行分析。结果表明：此次冰雹过程属高空冷涡型降雹，冰雹落区位于冷涡东南象限，距离冷涡中心大约7个纬度，发生在冷涡天气系统的对流多发区域。在冷涡形成过程中，干冷空气的不断南侵，高空槽在中低空逐渐前倾，在前倾槽和地面冷锋之间形成上干冷下暖湿的环境场，促使不稳定能最的不断积累。200hPa高空急流的发展促使低层切变线和地面系统的发展，触发了不稳定能量释放引发雹暴的生成。850hPa风场条件和湿度条件对出现冰雹非常有利。多普勒雷达资料表明，强对流属于超级单体风暴。可以分析出：发展旺盛时有中气旋，回波顶高在11kin以上，风暴底层有钩状回波和弱回波区，对应中高层回波悬垂，强回波达到55dBz以上且强回波垂直跨度在2～9km之间。垂直累积液态水最大值达到52kg．m-2。等特征，是典型的雹暴。
Using the convention meteorological data and Doppler radar data, a hail weather process on July 5th, 2011 in Chifeng was analyzed through Circulation background, mesoscale analysis, T-lnP diagram and radar echo characteristics. The results showed that this hail process was caused by high altitude cold vortex, and the drop area was in the southeast quadrant of cold vortex, about 7 latitude from the center of the cold vortex, where was high occurrence area of multi-convection. During the formation process of the cold vortex, the cold and dry air invaded south constantly, and the upper trough was forwarded in the low altitude gradually, therefore, the environment field between forward trough and surface cold front was cold and dry in the upper air mass while warm and humid in the lower place, which promoted instable energy to accumulate continually. The upper jet in 200hPa promoted the development of the shear line and ground system which triggers the release of instable energy and thus a hailstorm was formed. The wind and humidity conditions in 850hPa were very favorable for the hail. The data of Doppler radar showed that this strong convection was a supercell storm, and there was mesocyclone when the storm developed strongly, and the top of echo was over 1 lkm, and hook echo and weak echo were in the underlying of the storm, corresponds to the echo overhang in the middle and high level. The strong echo was more than 55dbz and the vertical span was between 2km and 9km, and the maximum of the VIL reached 52kg. m-2, these characteristics indicated that this was a typical hailstorm.
出处
《内蒙古气象》
2015年第3期7-10,共4页
Meteorology Journal of Inner Mongolia
