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高原气象  2008 

夏季梅雨期一次强江淮气旋位涡反演分析

, PP. 158-169

Keywords: 梅雨,江淮气旋,位涡扰动,位涡反演

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Abstract:

:在位涡框架下,利用位涡反演方法对2003年夏季梅雨期间沿梅雨锋东移的一次强江淮气旋发展过程进行了诊断分析。结果表明:高层强迫对低层气旋环流强度的贡献主要是通过增强中低层气旋上游的北风和下游的南风,促使气旋上下游高压脊发展,为气旋发展提供了一种有利的背景场,并在低层气旋达到成熟阶段以后增强其气旋性涡度。中低层的扰动自始至终都对低层气旋环流的发展起着十分重要的作用,它主要是通过先增强低层气旋中心东侧的南风促使气旋发展,并对高层气旋形成也起了一定的作用。底层热力异常对低层气旋环流的发展一直起反作用,阻碍其增强。进一步分析干湿空气的作用表明,不论是对低层气旋中心的位势高度降低或地面气压减压还是对低层气旋环流强度的增强,都是中低层饱和湿空气起主要作用。

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