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OALib Journal期刊
ISSN: 2333-9721
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河西走廊57年来气温和降水时空变化特征
DOI: 10.11821/xb201211005, PP. 1482-1492
Keywords: 气候变化,趋势,突变,河西走廊
Abstract:
采用滑动平均、线性回归等趋势分析方法以及Mann-Kendall、Pettitt和累积距平三种突变检验方法对河西走廊地区1955-2011年的气温和降水两个指标进行研究,从而揭示该地区气候变化的事实及趋势。研究显示河西走廊地区的气温在过去57年呈显著上升趋势,升温率是IPCC第四次报告中近50年变暖率的两倍,达0.27℃/10a,并且在1986年发生增温突变;四季气温中,冬季气温升高对年气温上升贡献最大。河西走廊年降水量在研究时段内呈显著增加趋势,降水增率为3.95mm/10a,但各个流域增加趋势并不显著;雨季降水量呈不显著的增加趋势,其年际变化与年降水量一致,雨季降水增量对年降水量增加贡献率大;河西走廊年降水量未发生突变,雨季降水量在1968年发生增加突变。河西走廊温度升高,降水量增加,总体向暖湿化发展,这种变化对该地区水资源脆弱性的影响需要进一步研究。
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