正斜压模演变所揭示的武汉暴雨过程

A Heavy Rainfall Event in Wuhan Explained by the Evolution of Barotropic and Baroclinic Modes

对 1998年 7月 2 1— 2 2日发生在武汉附近的大暴雨过程的大气正、斜压分量演变过程进行了研究 ,结果表明 :大气流场正压分量的演变与此次大暴雨的酝酿、发展和消亡具有内在的联系 ;正压分量在暴雨区的演变在一定程度上反映高、低空急流耦合形势 ;正、斜压平均相对模的演变与暴雨生命史相吻合。

The evolutions of barotropic and baroclinic modes in a heavy rainfall event occurred in Wuhan during 21—22 July of 1998 are explored.Results show that the evolution of barotropic component of atmospheric flow is closely related to the brewing,development and disappearance of the event.The evolution of barotropic component in rainfall area reflects the coupling pattern between the high and low-level jets to some extent.The evolutions of the mean barotropic and baroclinic modes are completely consistent with the life-time of the heavy rainfall event.