首页|Variations and trends of the freezing and thaw-ing index along the Qinghai-Xizang Railway for 1966-2004
Variations and trends of the freezing and thaw-ing index along the Qinghai-Xizang Railway for 1966-2004
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Annual freezing and thawing index of 7 meteorological stations along the Qinghai-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 ℃-d and the mean annual thawing indices range from 630 to 3250℃-d. The mean annual freezing index of the 7 stations exhibited decreasing trends with decreasing rate of -16.6- -59.1℃·d /10a. The mean annual thawing index of these 7 stations showed increasing trends with the related decreasing rate is 19.83-45.6℃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 indexglobal wanningtrendsqinghai-xizang railway
JIANG Fengqing、HU Ruji, LI Zhen
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Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China
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