中文摘要：

冰川积雪是寒区水资源的重要组成部分,在全球气候变暖背景下,进行寒区冰雪消融特性研究和融水量估算具有重要意义。以青藏高原纳木错流域为研究对象,采用2004—2013年MODIS数据对纳木错流域冰雪消融时空变异规律进行研究。结果表明：纳木错流域冰雪覆盖率年变化曲线呈＂双峰型＂,7—8月冰雪消融最为剧烈,而2月和11月是季节性积雪的主要积累阶段;冰雪覆盖量在空间分布上差异明显,地势较高、坡度较陡、阴坡比例较大的流域东南侧年均冰雪覆盖率较大,而流域西北侧与之相反。为进一步探讨气温变化对冰雪消融的影响,选取研究区内典型冰川融水补给区域——曲嘎切流域2013年8月实测数据,建立气温与冰雪融水径流间函数关系,模拟结果显示两者呈指数相关（R2=0.7105）,表明气候变暖、温度上升将引起寒区冰雪消融量的急剧增加。

英文摘要：

Glacier and snow is an important part of water resourcesat high altitudes,and the meltwater is the main driving force of frozen soil erosion,therefore identifying themelting characteristics and ablation calculation is of significance in alpine region. In this paper,Nam Co basin as the study area,we hope to get the temporal and spatial changes in this place by collecting weather,terrain,RS and MODIS data from 2004 to 2013,using GIS,ENVI and MRT processing software. We found： the annual variation curve of glacier and snow coverage in Nam Co basin was ＂ double-peak mode＂. The most intense ablation period was July and August,while the February and November was the main accumulation stage of seasonal snow; glacier and snow coverage had significant differences in spatial distribution,as the southeast basin with a higher ground,steeper slope,and larger proportion shady,it is larger than the northwest part,but the northwest side has larger changes in snow cover during an annual coverage is smaller. In addition,the typical watershed in glacierized area of the Nam Co basin,Qugaqie catchment,was selected to establish the relationship between air temperature and meltwater runoff with the measured data in August,2013. The simulation result showed that daily discharge in ablation period had a good correlation with temperature.