摘要
本文从1976,1990,1999的Landsat及2003年ASTER系列数字遥感影像上提取了喜马拉雅山脉西段纳木那尼峰地区的4期冰川空间分布数据,在Arc/Info中综合各期数据,建立研究区1976—2003年冰川变化图谱,定量分析了纳木那尼峰地区冰川的空间变化。图谱这种数据集成的方法明显优于直接将各期影像分类结果进行比较的传统研究方法。研究结果表明,纳木那尼峰地区的冰川以广泛退缩为主,但北部也有少量前进冰川存在。自1976年到2003年,冰川面积从84.41km2减少到77.29km2,各时段分别以平均0.17km/a,0.19km/a和0.77km/a的速度在退缩,冰川退缩明显加速。冰川退缩面积占研究区总面积的8.4%,明显比高亚洲冰川平均退缩比例(7%)大,表明西喜马拉雅山脉的冰川退缩比较严重。
This paper provides an alternative method of comprehensive research on glacier variation using multi-source and multi-temporal data. This work quantifies glacier variations of the Mt. Naimona＇ Nyi area by integrating glacier spatial data from ASTER and the Landsat series of satellite imagery at four different times： 1976, 1990, 1999, and 2003. Comparison of the results from individual images with those from the Tupu method indicates that the Tupu approach provides a better result in the research. Glacier variations were mapped and analyzed; discrepancies between images could be detected and removed from the integrated Grid data using remap tables in Arc/Info GRID module both graphically and numerically. Our results show that glaciers in the region both retreated and advanced during the last 28 years; however, retreat dominates and increases with time. The variation of glaciers in the western Himalayan region is dramatic compared with other regions in high Asia. From 1976 to 2003, glacier area decreased from 84.41km^2 to 77.29km^2. By the sequential images, it shows that glacier areas shrank by 0. 17km^2 a^-1, 0. 19km^2 a^-1 , and 0. 77 km^2 a^-1 , on average, during the periods 1976-1990, 1990-1999, and 1999-2003, respectively, suggesting that glacier retreat has accelerated. The retreat was most likely due to the negative glacial mass balance and was affected by rising temperature and decreasing precipitation in the region over the Tibetan Plateau.
出处
《遥感学报》
EI
CSCD
北大核心
2007年第4期511-520,共10页
NATIONAL REMOTE SENSING BULLETIN
基金
国家自然科学基金项目(编号:40601056
40121101
40401042
40201005)
国家重点基础研究发展计划项目(编号:2005CB422004)
中国科学院"百人计划"项目
中国科学院创新项目(编号:KZCX3-SW-339)
中国科学院地理科学与资源研究所知识创新工程自然科学基金延伸支持领域前沿项目(编号:CXIOG-A04-03)
关键词
冰川变化
GIS
RS
图谱
基本单元
纳木那尼峰
glacier variation
GIS （ Geographical Information System）
RS
Tupu
the integrated unit
Mt. Naimona＇ Nyi
