In this paper,the characteristics of the twice cold wave during the spring on March 12 to March 14 in 2011 and April 22 to April 24 in2012 in Hexi Corridor region were compared and analyzed from the aspects of the evolution of circulation patterns that occurred in cold weather process and variation of various physical quantities such as vorticity,vertical speed,temperature advection,etc. The following conclusions were drawn in major :These two typical cold wave weather processes both occurred in spring and ...
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