2000-2013年木孜塔格冰鳞川冰川粒雪线高度变化研究  

The variations of firn line altitude on the Binglinchuan Glacier,Ulugh Muztagh during 2000-2013

作　　者：陈安安[1,2] 陈伟 吴红波[1,2] 张伟[1,2] 吴玉伟 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]新疆阿尔金山国家级自然保护区管理局,新疆库尔勒841000

出　　处：《冰川冻土》2014年第5期1069-1078,共10页Journal of Glaciology and Geocryology

基　　金：全球变化研究国家重大科学研究计划项目(2010CB951404);中国科学院战略性先导科技专项(B类)(XDB03030204);国家自然科学基金项目(41190084);中国科学院寒区旱区环境与工程研究所人才基金项目(Y351111001)资助

摘　　要：以祁连山七一冰川为例,基于Landsat TM/ETM+数据建立了通过单波段(近红外波段)阈值法提取雪线的方法,并结合观测数据进行了验证.将此方法应用到2000-2013年木孜塔格冰鳞川冰川粒雪线高度变化的估算中,结合茫崖气象站暖季气温(9、7、8月份的平均气温)和6-8月降水量数据,探索粒雪线高度与气温、降水量之间的关系.结果表明:单波段阈值法可较为准确地估计冰川的雪线位置,2000-2013年冰鳞川冰川粒雪线高度呈波动变化,在2006年达到最大值(海拔5 678 m).气温升高是冰鳞川冰川粒雪线高度变化的主导因素,气温上升1℃可导致粒雪线高度升高约83 m.Taking the Qiyi Glacier in the Qilian Mountain as an example,a new method of single-band threshold（ near-infrared band） was used for snow line extraction based on Landsat TM /ETM ＋ data. The rationalization of the method was tested by comparing it with the observation data. This method was then applied to estimate the firn line altitude（ FLA） in the Binglinchuan Glacier during 2000-2013. Warm season air temperature and precipitation from July to August at Mang＇ai Station is used to explore the response of FLA to temperature and precipitation. It is found that snow line can be derived accurately by single-band threshold. The FLA of the Binglinchuan Glacier had fluctuated from 2000 to 2013, w ith the maximum of 5 678 m in 2006.Temperature increasing w as the main dominant factor governing the variation of FLA. Air temperature increasing 1 ℃ will result in firn line altitude rising 83 m.

关 键 词：遥感 粒雪线高度 气象因子 七一冰川 冰鳞川冰川 

分 类 号：P343.6[天文地球—水文科学]