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冰川冻土  2011 

1960-2009年塔里木河流域降水时空演化特征及原因分析

, PP. 1268-1273

Keywords: 降水,时空演化,水汽输送,局地水循环,海陆间水循环

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Abstract:

利用1960-2009年新疆塔里木河流域(TRB)26个气象站的日降水资料以及美国NCEP/NCAR的逐月再分析资料(2.5°×2.5°),对塔里木河流域降水的时空分布特征及其原因进行了分析.结果表明塔里木河流域降水总体上呈现由东南向西北逐渐增加的分布形态,但不同季节之间以及降水量多年和少年之间存在差异,这与水汽输送通道及其季节性变化有关;不同区域降水的年际变化较为一致,但在1987-2003全球变暖最为明显的十多年间,山区降水和整个流域垂直方向的水汽输送存在较一致的明显的上升趋势,而平原降水和该地区水平方向水汽净输入量存在较一致的但不太明显的下降趋势,山区和平原的降水差异可能是由于山区和平原的降水对局地水循环和海陆间水循环的依赖程度不同所致.

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