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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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喜马拉雅山北坡卡鲁雄曲径流与气候变化
DOI: 10.11821/xb200611003, PP. 1141-1148
Keywords: 水情,气候变化,Mann-Kendall检验,卡鲁雄曲,西藏
Abstract:
以冰川融水补给为主的喜马拉雅山北坡的卡鲁雄曲流域,近20年平均气温以0.34oC/10a的趋势上升,高于西藏年均温0.26oC/10a的增长率,更是明显高于全国和全球气温的增长率,且极端最高温都出现在20世纪90年代。后10年气温(1994~2003年)比前十年(1983~1993年)升高0.5oC,径流量增加了26%；不同月份径流增加强度不同,10~2月增加了44%,7~9月增加了27%,3~6月增加了24%。径流对气候变化的响应最灵敏(一年中有8个月的增加趋势通过了α=0.05的显著性检验),尤其是秋冬季的径流(增加趋势超过α=0.01的显著性检验)。受冰川消融和季风影响,不同时期的径流有不同的影响因素,但存在共性,即气温对径流起着积极主导作用,而降水对径流的影响具有不确定性,即正负双面效应。
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