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地理科学  2014 

1960~2010年西北干旱区极端降水特征研究

, PP. 1134-1138

Keywords: 西北干旱区,强降水,STARDEX

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Abstract:

基于中国西北干旱区1960~2010年70个台站逐日降水资料,采用欧盟组织(STARDEX)定义的降水极值指数,分析结果表明①研究区近51a来强降水发生频次、湿期平均长度表现出增多和增长趋势,干日数和干期平均长度表现出减少和变短趋势;②单次强水的强度在增加,表现为湿日数减少,而降水的总量却显著增加。③湿日数减少主要是0~6mm强度的降水日数减少,12~24mm强度的降水日数显著增加,后者对降水总量的增加贡献较大。④绝大部分站点强降水(>12mm)的雨日(量)都以上升趋势为主,表现为下降趋势的站点极少。

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