一次春季强寒潮天气过程分析

A Weather Process Analysis of Strong Cold Wave in Spring

利用常规的高空实况资料、物理量场和NCAP再分析资料等,对昌吉州一次强寒潮天气进行分析,结果表明:强降温、强降水和大风天气是本次天气过程的主要特征;高空影响系统为西西伯利亚低涡;造成强降温的主要原因是高空冷平流和地面冷高压的入侵;大风形成的动力原因在于高空动量下传和强的气压梯度力。

Using conventional high live data, physical quantity field, NCAP reanalysis data and so on, a strong cold wave weather in Changji was analyzed. The results showed that strong cooling, heavy preci-pitation and strong wind are main features of this weather process. West Siberia low vortex is the upper level effect system. Upper level cold advection and the invasion of surface cold high pressure are main causes of the strong cooling. Downward transport of momentum from high level and strong pressure gradient force are dynamic reasons for the formation of the strong wind.