1976年以来珠穆朗玛峰地区冰川变化(英文)

编号 zgly0001586266

文献类型 期刊论文

文献题名 1976年以来珠穆朗玛峰地区冰川变化(英文)

作者 聂勇  张镱锂  刘林山  张继平 

作者单位 InstituteofGeographicSciencesandNaturalResourcesResearch  CAS  GraduateUniversityofChineseAcademyofSciences 

母体文献 Journal of Geographical Sciences 

年卷期 2010年05期

年份 2010 

分类号 P343.63 

关键词 glacialchange  glacialretreat  Himalayas  Mt.Qomolangma(Everest)NationalNaturePreserve  remotesensing 

文摘内容 Glaciers are one of the most important land covers in alpine regions and especially sensitive to global climate change.Remote sensing has proved to be the best method of investigating the extent of glacial variations in remote mountainous areas.Using Landsat thematic mapping(TM) and multi-spectral-scanner(MSS) images from Mt.Qomolangma(Everest) National Nature Preserve(QNNP),central high Himalayas for 1976,1988 and 2006,we derived glacial extent for these three periods.A combination of object-oriented image interpretation methods,expert knowledge rules and field surveys were employed.Results showed that(1) the glacial area in 2006 was 2710.17 ± 0.011 km2(about 7.41% of the whole study area),and located mainly to the south and between 4700 m to 6800 m above sea level;(2) from 1976 to 2006,glaciers reduced by 501.91 ± 0.035 km2 and glacial lakes expanded by 36.88 ± 0.035 km2;the rate of glacier retreat was higher in sub-basins on the southern slopes(16.79%) of the Himalayas than on the northern slopes(14.40%);most glaciers retreated,and mainly occurred at an elevation of 4700-6400 m,and the estimated upper limit of the retreat zone is between 6600 m and 6700 m;(3) increase in temperature and decrease in precipitation over the study period are the key factors driving retreat.