Journal of Geographical Sciences

, Volume 18, Issue 1, pp 3–16 | Cite as

Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966–2004

  • Fengqing JiangEmail author
  • Ruji Hu
  • Zhen Li


Annual freezing and thawing index of 7 meteorological stations along the Qing-hai-Xizang Railway were calculated based on daily maximum and minimum temperature records for 1966–2004. Trends of annual freezing and thawing index were analyzed using the Mann-Kendall test and a simple linear regression method. The results show that: 1) The mean annual freezing indices range from 95 to 2300°C·d and the mean annual thawing indices range from 630 to 3250°C·d. The mean annual freezing index of the 7 stations exhibited decreasing trends with decreasing rate of −16.6—−59.1°C·d /10a. The mean annual thawing index of these 7 stations showed increasing trends with the related decreasing rate is 19.83–45.6°C·d /10a. 2) The MK trend test indicated the significant decreasing trends (significant at < 0.05 significant level) in the annual freezing index for most stations except for Golmud. The significant increasing trends can be observed in the annual thawing index for 4 stations except Golmud and Tuotuohe. Golmud was the only station with no trends in both annual freezing and annual thawing index.


freezing and thawing index global warming trends Qinghai-Xizang Railway 


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Copyright information

© Science in China Press 2008

Authors and Affiliations

  1. 1.Xinjiang Institute of Ecology and GeographyCASUrumqiChina

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