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GEOGRAPHICAL RESEARCH >

2011 , Vol. 30 >Issue 5: 939 - 952

DOI: https://doi.org/10.11821/yj2011050018

Earth Surface Processes

Monitoring glacial variations based on remote sensing in the Luozha region, eastern Himalayas, 1980-2007

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  • 1. Shangqiu Normal University, Shangqiu 476000, Henan, China;
    2. Institute of Tibetan Plateau Research, CAS, Beijing 100085, China

Received date: 2010-07-06

  Revised date: 2010-10-28

  Online published: 2011-05-20

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Abstract

Based on the topographic maps in 1980, 1988/1990 Landsat TM, 2000 Landsat ETM+ and 2007 ALOS AVNIR-2 remote sensing data, the glacier boundaries in the Luozha region of eastern Himalayas in the four periods were manually mapped in the false-color image by on-screen digitizing. Spatial-temporal distribution chara and changes of glaciers were analyzed by means of geographical information system and remote sensing technologies. Moreover, the reasons for glacial changes were investigated with the aid of temperature and precipitation data covering that period. The results showed that: (1) From 1980 to 2007, the total glacier area decreased from 491.64 km2 to 410.87 km2. The overall loss was 80.76 km2, or 16.4% of the whole glacial area in 1980. (2) The inverse relationship between initial area and change rate indicated that small glaciers receded faster than big ones. As the number of glaciers with area less than 1 km2 was 236, accounting for 71.7% of the total number of glaciers, the glacier system of Luozha region may be very sensitive to climate change. (3) Glacier melt mainly occurred at area below 6500 m, accounting for 98.8% of the area loss of all the glaciers in the study area. (4) During 1980-2007, the glacier areas reduced on all slopes, while the larger area loss happened on the lower slopes. (5) The area reduction of glaciers facing east, southeast, south and southeast was larger than that of glaciers facing north, northeast, west and northwest during this period. (6) The retreat rate of eastern Himalayan glaciers was faster than that of central and western Himalayas, and the Himalayan glaciers retreated faster than those in the hinterland of the Tibetan Plateau. (7) Finally, rising temperature along with little change in the precipitation in the Luozha region was the main factors that caused glacier retreat.

Key words： glacier variations; remote sensing; Himalayas; Luozha region

Cite this article

LI Zhi-guo, YAO Tan-dong, YE Qing-hua, TIAN Li-de, LI Chao-liu . Monitoring glacial variations based on remote sensing in the Luozha region, eastern Himalayas, 1980-2007[J]. GEOGRAPHICAL RESEARCH, 2011 , 30(5) : 939 -952 . DOI: 10.11821/yj2011050018

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