通辽市一次暴雪天气过程诊断分析

应用常规气象观测资料、多普勒雷达数据和高时空分辨率的地面自动气象站资料,对2013年3月23日发生在通辽市的暴雪天气进行诊断分析,结果表明:强烈发展的高空槽是触发暴雪的动力机制;低空急流与地面西南气流在低层积聚大量水汽辐合,为暴雪的发生提供了重要的水汽条件;涡度和散度、能量与比湿等与暴雪关系密切;自动气象站逐时风场中"逆切变"的存在与强降雪发生时间和影响区域有较好的对应;雷达产品特征对暴雪有明显的指示作用。

Diagnostic Analysis of a Snowstorm Weather Process in Tongliao City

Based on convention meteorological observation data, Doppler radar data and ground automatic stations data with high temporal and spatial resolution, the snowstorm weather process occurred in Tongliao on March 23, 2013 was analyzed. The results showed that strongly developed upper trough provided the motive force mechanism for the formation of the snowstorm. The low-level jet converged with abundant moisture which was gathered by surface southwest flow in the lower layer provided the important water vapor conditions for the occurrence of the snowstorm. Vorticity, divergence, energy and specific humidity were closely related to the occurrence of the snowstorm. There were good correspondence between backwards shear of hourly wind field from ground automatic weather stations and occurrence time and affect regional of the snowstorm. Meanwhile, radar products feature had obvious indicative function on the occurrence and development of the Snowstorm.