地理学报(英文版)
地理學報(英文版)
지이학보(영문판)
JOURNAL OF GEOGRAPHICAL SCIENCES
2008年
1期
3-16
,共14页
姜逢清%胡汝骥%李珍
薑逢清%鬍汝驥%李珍
강봉청%호여기%리진
freezing and thawing index%global warming%trends%Qinghai-Xizang Railway
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 indidecreasing 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.