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1960-2013年秦岭—淮河南北极端降水时空变化特征及其影响因素

DOI: 10.11820/dlkxjz.2015.03.010, PP. 354-363

Keywords: 气候变化,极端降水,时空变化,秦岭—淮河南北

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Abstract:

基于秦岭—淮河南北气象站点逐日降水数据和全国0.5°×0.5°逐月降水格网数据,选取16个极端降水指数,辅以趋势分析、Mann-Kendall检验和相关分析等气候诊断方法,分析了1960-2013年秦岭—淮河南北极端降水时空变化特征,探讨了极端降水变化与ENSO事件的关系。结果表明①1960-2013年秦岭—淮河南北除长江下游降水呈增加趋势外,其他区域降水均呈下降趋势;②极端降水变化主要表现为降水日数减少,降水强度上升,突发性强降水事件增多,连续性干旱事件增多;在空间上,秦巴山地、长江下游和黄河下游以极端降水强度上升为主,关中平原、巫山山区和四川盆地以极端干旱强度上升为主;③在影响因素方面,秦岭—淮河南北极端降水与ENSO事件关系密切。在厄尔尼诺年,秦岭—淮河南北春季极端降水偏多,夏季和全年偏少;在拉尼娜年,春季极端降水偏少,秋季和全年偏多。就各个区域而言,在厄尔尼诺年,黄河下游、关中平原、秦巴山地和四川盆地极端降水呈下降趋势,淮河平原极端降水呈上升趋势,长江下游和巫山山区响应并不明显。

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