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冰川冻土  1997 

试论温室效应对我国西部河川径流的影响

, PP. 10-16

Keywords: 温室效应,河川径流,影响

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Abstract:

大气中日益增多的温室气体使我国西部地区的气候在近三四十年来出现了干暖化趋势,导致河川径流量明显减少.据统计,从50年代后半期到80年代,新疆地区的河川径流量减少了6.4%;西藏东南部的3条大河从60年代到80年代则平均减少了13.2%,其减少量远大于新疆.这主要是因为气温升高使冰雪融水增加,新疆的河流受到冰雪融水的补偿.虽然西藏东南部的河流也有冰川存在,甚至冰川覆盖面积远大于新疆一些内陆河流域,但那里有更加丰沛的降水对河川径流的变化起着主导作用,使冰雪融水的作用相形见拙.

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