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1961~2004年海河流域夏季逐时降水变化趋势

, PP. 256-266

Keywords: 逐时降水资料,降水过程,日变率,东亚夏季风,海河流域

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Abstract:

?利用海河流域21个气象站1961~2004年夏季逐时降水资料,分析海河流域夏季极端小时降水、降水过程雨强的长期变化趋势.结论如下:海河流域夏季总降水量和总降水小时数以及长、短历时降水量均呈减少趋势,但短历时降水量占总降水量的比重呈增加趋势.短历时降水过程平均雨强和峰值雨强均呈增加趋势,到达峰值雨强的时刻略有提前,可能与这一地区地表气温上升,而对流层中上层气温下降,引起上下层热力差异加剧有关.长历时降水量与东亚夏季风指数的相关系数达到0.63.尽管近40年长历时降水量显著减少,但长历时降水过程平均雨强和峰值雨强,以及≥10mm/h的极端小时降水在流域的东西部呈相反的变化趋势,即东部呈减少趋势,西部呈增加趋势.这一差异可能与流域东西部显著的地形差异有关.

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