昆明静止锋下的云南强倒春寒天气分析

Analysis of Yunnan Severe Coldness in the Late Spring under Kunming Quasi-stationary Front

利用NCEP1°×1°的6小时再分析资料和常规观测资料,对2005年3月云南出现强倒春寒天气过程的环流特征和物理量场特征进行了分析,探讨了在无南支槽的配合下,由昆明静止锋和高空切变线引发的大范围降雪和降温的强倒春寒天气发生前后中低层环流的演变、热力学和动力学物理因子与倒春寒天气的关系及其形成条件,为今后预测这类天气提供参考依据。

The characteristics of circulation and physical quantity of severe coldness in the late spring in Yunnan Province under Kunming Quasi-stationary front during the spring of 2005 are analyzed based on NCEP reanalysis data. The results show that the severe coldness caused by Kunming quasi-stationary front and the upper level shear are related closely to the evolution of circulation, humidity field and vapor transfer, if there is no southern branch trough. The moisture from the northern Burma is converged and uplifted at the middle and lower levels. All these results help to give physic basis of forecast this kind of severe coldness in late spring in Yunnan.