Recent changes in glacial area and volume on Tuanjiefeng peak region of Qilian Mountains, China

Glaciers' runoff in the Qilian Mountains serves as a critical water resource in the northern sections of the Gansu province, the northeastern sections of the Qinghai province, and the northeastern fringe of the Tibetan Plateau. Changes in the glacial area and volume around the highest peak of t...

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Bibliographic Details
Published in:PloS one 2013-08, Vol.8 (8), p.e70574
Main Authors: Xu, Junli, Liu, Shiyin, Zhang, Shiqiang, Guo, Wanqin, Wang, Jian
Format: Article
Language:English
Subjects:
Altitude
China
Climate change
Cold
Cryosphere
Digital Elevation Models
Digital imaging
Earth Sciences
Elevation
Engineering research
Glacial dynamics
Glacial runoff
Glacier thickness
Glaciers
Glaciohydrology
Global Warming
Hydrology
Ice - analysis
Ice Cover
Information systems
Laboratories
Mountain glaciers
Mountains
Precipitation
Radar
Remote sensing
Rivers
Runoff
Science
Shrinkage
Studies
Topographic mapping
Topographic maps
Topography
Water resources
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Summary:Glaciers' runoff in the Qilian Mountains serves as a critical water resource in the northern sections of the Gansu province, the northeastern sections of the Qinghai province, and the northeastern fringe of the Tibetan Plateau. Changes in the glacial area and volume around the highest peak of the Qilian Mountains, i.e., Tuanjiefeng Peak, were estimated using multi-temporal remote-sensing images and digital elevation models, and all possible sources of uncertainty were considered in detail. The total glacier area decreased by 16.1±6.34 km(2) (9.9±3.9%) during 1966 to 2010. The average annual glacier shrinkage was -0.15% a(-1) from 1966 to 1995, -0.61% a(-1) from 1995 to 2000, -0.20% a(-1) from 2000 to 2006, and -0.45% a(-1) from 2006 to 2010. A comparison of glacier surface elevations using digital elevation models derived from topographic maps in 1966 and from the Shuttle Radar Topography Mission in 1999 suggests that 65% of the grid cells has decreased, thereby indicating that the glacier thickness has declined. The average change in glacier thickness was -7.3±1.5 m (-0.21±0.04 m·a(-1)) from 1966 to 1999. Glaciers with northeastern aspects thinned by 8.3±1.4 m from 1966 to 1999, i.e., almost twice as much as those with southwestern aspects (4.3±1.3 m). The ice volume decreased by 11.72±2.38×10(8) m(3) from 1966 to 1999, which was about 17.4% more than the value calculated from the statistical relationship between glacier area and volume. The relationship between glacier area change and elevation zone indicates that glacier change is not only dominated by climate change but also affected by glacier dynamics, which are related to local topography. The varied response of a single glacier to climate change indicates that the glacier area change scheme used in some models must be improved.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0070574