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近50年北京地区主要灾害性天气事件变化趋势

, PP. 47-52

Keywords: 北京,灾害性天气事件,变化趋势

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Abstract:

应用1958-2008年逐日气象观测资料,对北京地区的几种主要灾害性天气事件进行了统计分析。结果表明:(1)各种灾害性天气事件的发生频率与强度均具较大的年际变化特征,高温事件的分布为双峰型结构,1990年代以来为高温多发期,年极端高温强度及连续高温日数均有增加的趋势,低温事件的变化趋势则正好相反;(2)强对流天气事件如暴雨、冰雹、雷暴日数的下降趋势不明显,但强度有减弱的迹象,大风、沙尘暴、大雾事件下降趋势明显;(3)北京年酸雨日数上升趋势明显,酸雨pH值的变化表明污染日趋严重;(4)北京气候变暖突变发生前后某些极端天气频率和强度表现出明显差异,其突变点相差1~2a间隔,表明极端事件对于气候增暖变化需要一个响应过程。

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