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近20年中国阿尔泰山区冰川湖泊对区域气候变化响应的时空特征

1. 1. 新疆大学绿洲生态教育部重点实验室,乌鲁木齐 830046
2. 新疆大学智慧城市与环境建模普通高校重点实验室,乌鲁木齐 830046
• 收稿日期:2014-08-27 修回日期:2014-11-02 出版日期:2015-02-10 发布日期:2015-03-17
• 作者简介:

作者简介：陈晨（1989- ）,男,甘肃平凉人,硕士,主要从事资源环境遥感研究。E-mail:gis_chen@126.com

• 基金资助:
教育部创新团队项目（IRT1180）;水利部公益性行业科研专项经费项目（201301103）

The response of glacial lakes in the Altay Mountains of China to climate change during 1992-2013

Chen CHEN1,2(), Jianghua ZHENG1,2(), Yongqiang LIU1,2, Zhonglin XU1,2

1. 1. Key Laboratory of Oasis Ecology Ministry of Education, Xinjiang University, Urumqi 830046, China
2. Key Laborary of City Intellectualizing and Environment Modelling, Xinjiang University, Urumqi 830046, China
• Received:2014-08-27 Revised:2014-11-02 Online:2015-02-10 Published:2015-03-17

Abstract:

Glacial lakes of the Altay Mountains in China during the past 20 years were interpreted and classified based on the remote sensing images of Landsat TM(1992)/ETM+(2002)/OLI(2013) respectively, with properties including basin, altitude and slope gained from SRTM DEM by spatial overlay analysis in GIS. The features of temporal-spatial distribution and variation of glacial lakes during 1992-2013 and factors which impacted the evolution of glacial lakes in this area were discussed. The results indicate that: (1) there were 1147 glacial lakes in the Altay Mountains of China in 2013, with a total area of 101.628 km2, and both the number and area of glacial lakes increased during the past two decades. (2) The responses of ice-scour lakes and moraine-dammed lakes to climate change were totally different. (3) With temperature rising, the peak of profit and loss of ice-scour lakes reached a higher altitude, and the variation of moraine-dammed lakes became more unstable. (4) Westerly circulation had a significant influence on the glacial lakes, the precipitation on the west-facing slope was sufficient, therefore the west-facing ice-scour lakes varied little, while the west-facing moraine-dammed lakes kept expanding as the profit constantly overmatched the loss. (5) Owing to the lower elevation, glacial lakes in this region were sensitive to climate change than other alpine-plateau areas in western China over the past two decades, both surplus and deficit of water were of high quantity, resulting in few net increment after lake water balance. (6) The magnitude of temperature rise and precipitation reduction during 1992-2002 were larger compared with the period 2002-2013, and the quantity of water surplus and deficit of glacial lakes in spatial units of each size was greater compared with the 2002-2013 period. There is a positive correlation between water surplus and deficit of glacial lakes and the range of temperature rise and precipitation reduction.