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大气科学  2005 

2002年6月8~9日陕南大暴雨数值模拟研究

DOI: 10.3878/j.issn.1006-9895.2005.05.14

Keywords: 暴雨,数值模拟,β中尺度,位涡,地形

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Abstract:

通过对2002年6月8~9日陕南大暴雨过程进行数值模拟,模拟结果较好地复制了这次陕南大暴雨过程以及与之相联系的影响陕南地区中尺度对流系统的发生、发展过程.位涡分析结果表明,低层正值位涡扰动的存在是暴雨发生发展的重要条件.冷空气是从中层侵入西北地区东部,这样就形成了较强的对流不稳定层结,有利于对流降水的发生.大巴山使秦岭山脊、汉江河谷降水减小,使秦岭东南坡和渭河河谷下游降水增加;而秦岭使汉江河谷、秦岭南坡降水增加,使秦岭山脉本身和陕北地区降水减少,秦岭山脉对降水的影响主要是通过地形产生的垂直次级环流实现的.

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