黄河流域近50a极端降水指数的时空变化
Keywords: 时空变化,极端降水指数,黄河流域?
Abstract:
?根据黄河流域80个气象站1957—2008年的逐日降水资料,利用rclimdex软件选用了10个极端降水指数,采用mann-kendall趋势检验法和线性回归分析法,研究了极端降水指数在年和季节尺度上的时空变化特征。结果表明:极端降水指数中除了rx5day呈显著下降趋势、sdii呈上升趋势外,其他8个指数均呈非显著下降趋势;从极端气候指数的四季变化来看,rx1day和rx5day在夏、秋季的空间分布相似,且数值大于春、冬季的;黄河流域降水量呈逐年减小趋势,极端降水指数的变化趋势不明显,但存在时空差异。
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