单 位：
兰州大学资源环境学院;冰川与生态地理研究所
摘 要：
近年来全球气候变暖,我国山地冰川发生剧烈变化。针对天山东部地区冰川变化对天山山脉乃至我国西部地区冰川变化具有明显指示作用,利用1990年、2001年和2011年三个时段Landsat TM、ETM+遥感影像数据,运用比值阈值法结合目视解译分别提取了博格达山脉、巴里坤山脉和哈尔里克山脉的冰川边界,并在GIS技术支持下分析了该区冰川变化情况。研究表明:天山东部地区冰川面积整体退缩幅度较大,近21a间冰川总体退缩了26.80%,其中博格达山脉、巴里坤山脉、哈尔里克山脉分别退缩33.58%,25.67%,16.08%。该地区冰川主要分布在西北、北和东北三个坡向,但东坡的冰川退缩速率最大为30.68%,研究区冰川面积主要分布在海拔为3 600~4 600m处,而在3 300~3 400m处的冰川退缩最快。研究认为气温上升、降水量小幅度上升甚至下降是引起天山东部地区冰川退缩的主要原因。此外,地形条件也是影响冰川退缩的重要因素。
译 名：
Response of Glacier Retreat to Climate in Eastern Tianshan from 1990 to 2011
作 者：
LI Jia;YANG Tai-bao;HE Yi;TIAN Hong-zhen;College of Earth and Environmental Sciences,Institute of Glaciers and Ecology;
关键词：
eastern Tianshan;;RS and GIS;;glacier change
摘 要：
In the background of warming in recent decades,mountain glaciers in China had also changed dramatically.Glacier changes in the eastern part of Tianshan have obvious indication to glacier changes on the Tianshan Mountains and the China′s western region.The Bogurda,Balikun and Hal Rick mountains were selected as the regions to search a method for delineating glacier extent by Landsat TM,ETM+images of1990,2001and 2011.The changes of glaciers were analyzed under the support of the geographic information system technology.The results indicate that glacier whole range is larger in eastern Tianshan.The total areas have reduced by 26.80%in the past 21years.However,Bogurda,Balikun,Hal Rick mountains have retreated 33.58%,25.67%,16.08%,respectively.The glaciers mainly distributed in the northwestern slope,northern slope and northeastern slope,but retreat rate of eastern slope was the largest,reaching to30.68%.Glaciers in the study area mainly distributed at the altitude of 3 600~4 600m,glacier retreat in the3 300~3 400mwas the fastest.The results from the studies show that rising temperatures and fluctuation rainfall are the main causes of glacier retreat in eastern Tianshan.In addition,topographic condition is a key factor for glacier changes as well.
