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地理学报  2008 

祁连山区气候变化的区域差异特征及突变分析

DOI: 10.11821/xb200803004, PP. 257-269

Keywords: 年际变化趋势,气候突变,祁连山区

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Abstract:

利用8个气象站的气温和降水资料,运用一元回归分析法和5年趋势滑动,进行了气候变化的趋势分析,结果表明祁连山区在20世纪80年代中后期气温持续升高,90年代以后明显变暖,其中秋、冬季升温幅度较大;60年代降水量最少,之后逐渐增多,80年代达到最多,90年代又减少,2000年以来又明显增多;气温变化在空间上表现为南北差异,以黑河干流为界,中东部升温幅度从南到北呈增大趋势,而中西部从南到北呈减小趋势;降水变化的空间差异也明显,东部表现为东西差异,降水量增加幅度从东到西呈减小趋势,而中、西部表现为南北差异,降水量增加幅度从南到北呈减小趋势。在此基础上,利用滑动T检验法、Cramer法、Mann-Kendall法进行气候突变分析,结果表明祁连山区气温突变比降水突变明显,不同方法检验的结果比较一致;春、夏季气温在1997年发生突变,而秋、冬季在1985年左右发生突变。

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