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Journal of Mountain Science

, Volume 6, Issue 3, pp 221–227 | Cite as

Distribution of borehole temperature at four high-altitude alpine glaciers in Central Asia

  • Yaping Liu
  • Shugui Hou
  • Yetang Wang
  • Linlin Song
Article

Abstract

The distribution of borehole temperature at four high-altitude alpine glaciers was investigated. The result shows that the temperature ranges from −13.4°C to −1.84°C, indicating the glaciers are cold throughout the boreholes. The negative gradient (i.e., the temperature decreasing with the increasing of depth) due to the advection of ice and climate warming, and the negative gradient moving downwards relates to climate warming, are probably responsible for the observed minimum temperature moving to lower depth in boreholes of the Gyabrag glacier and Miaoergou glacier compared to the previously investigated continental ice core borehole temperature in West China. The borehole temperature at 10 m depth ranges from −8.0°C in the Gyabrag glacier in the central Himalayas to −12.9°C in the Tsabagarav glacier in the Altai range. The borehole temperature at 10 m depth is 3∼4 degrees higher than the calculated mean annual air temperature on the surface of the glaciers and the higher 10 m depth temperature is mainly caused by the production of latent heat due to melt-water percolation and refreezing. The basal temperature is far below the melting point, indicating that the glaciers are frozen to bedrock. The very low temperature gradients near the bedrock suggest that the influence of geothermal flux and ice flow on basal temperature is very weak. The low temperature and small velocity of ice flow of glaciers are beneficial for preservation of the chemical and isotopic information in ice cores.

Keywords

Borehole temperature Glacier Central Asia Climate warming 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH 2009

Authors and Affiliations

  • Yaping Liu
    • 1
    • 2
  • Shugui Hou
    • 1
  • Yetang Wang
    • 1
  • Linlin Song
    • 1
  1. 1.State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesBeijingChina
  2. 2.Graduate University of Chinese Academy of SciencesBeijingChina

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