Reduced winter runoff in a mountainous permafrost region in the northern Tibetan Plateau

Tanguang Gao, Tingjun Zhang, Lin Cao, Shichang Kang, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

The degradation of mountain permafrost under climate warming may alter the runoff regime of high mountainous catchments. In this study, we evaluated the influence of permafrost on the hydrological regime using hydrological signals in the Yeniugou Basin located in a mountainous permafrost region in the Qilian Mountains of the northern Tibetan Plateau (TP). The effect of permafrost degradation on the hydrological response was assessed based on 28 years of runoff and meteorological data. The results indicated that the investigated region exhibited a large increase in annual surface ground temperature from 1979 to 2006, with almost unchanged precipitation and evaporation potential. The winter runoff levels exhibited a significant decreasing linear trend, whereas the annual runoff and runoff in other seasons did not show any distinct linear trends. According to a comprehensive analysis of the relationships between winter runoff and meteorological factors, the ratio of maximum (Qmax) and minimum (Qmin) discharge, the recession coefficient and baseflow separation, and the reduced winter runoff were significantly correlated with thawing of permafrost. However, due to a time-lag response of climate forcing to permafrost thawing, some of these changes are undetectable over a short period. This study provides preliminary data on cold region hydrology and its response to climate change.

Original languageEnglish
Pages (from-to)36-43
Number of pages8
JournalCold Regions Science and Technology
Volume126
DOIs
Publication statusPublished - 1 Jun 2016
Externally publishedYes

Keywords

  • Climate change
  • Hydrological regime
  • Permafrost degradation
  • Runoff
  • Tibetan Plateau

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • General Earth and Planetary Sciences

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