1966-2004年青藏铁路沿线年冻结与融化指数的变化趋势 |
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引用本文: | 姜逢清,胡汝骥,李珍.1966-2004年青藏铁路沿线年冻结与融化指数的变化趋势[J].地理学报(英文版),2008,18(1):3-16. |
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作者姓名: | 姜逢清 胡汝骥 李珍 |
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作者单位: | Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China |
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基金项目: | Knowledge Innovation Program of Xinjiang Institute of Ecology and Geography, CAS, No.0571041 |
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摘 要: | 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℃·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.
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关 键 词: | 青藏铁路 冻结 融化指数 变化趋势 全球变暖 |
收稿时间: | 8/6/2007 12:00:00 AM |
修稿时间: | 2007-09-25 |
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