Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004
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 m...
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ftchacadscienegi:oai:ir.xjlas.org:365004/10250 2023-05-15T17:57:53+02:00 Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004 Jiang Fengqing Hu Ruji Li Zhen Jiang, FQ, CAS, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China 2008 http://ir.xjlas.org/handle/365004/10250 unknown JOURNAL OF GEOGRAPHICAL SCIENCES Jiang Fengqing; Hu Ruji; Li Zhen.Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004,JOURNAL OF GEOGRAPHICAL SCIENCES,2008,18(1):40618 http://ir.xjlas.org/handle/365004/10250 Tibet Plateau Permafrost 地理学::自然地理学 期刊论文 2008 ftchacadscienegi 2022-05-26T13:04:20Z 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 degrees C.d and the mean annual thawing indices range from 630 to 3250 degrees C.d. The mean annual freezing index of the 7 stations exhibited decreasing trends with decreasing rate of -16.6- -59.1 degrees C center dot d/10a. The mean annual thawing index of these 7 stations showed increasing trends with the related decreasing rate is 19.83-45.6 degrees C center dot 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. Report permafrost Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences: EGI OpenIR Kendall ENVELOPE(-59.828,-59.828,-63.497,-63.497) |
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Open Polar |
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Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences: EGI OpenIR |
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ftchacadscienegi |
language |
unknown |
topic |
Tibet Plateau Permafrost 地理学::自然地理学 |
spellingShingle |
Tibet Plateau Permafrost 地理学::自然地理学 Jiang Fengqing Hu Ruji Li Zhen Jiang, FQ, CAS, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004 |
topic_facet |
Tibet Plateau Permafrost 地理学::自然地理学 |
description |
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 degrees C.d and the mean annual thawing indices range from 630 to 3250 degrees C.d. The mean annual freezing index of the 7 stations exhibited decreasing trends with decreasing rate of -16.6- -59.1 degrees C center dot d/10a. The mean annual thawing index of these 7 stations showed increasing trends with the related decreasing rate is 19.83-45.6 degrees C center dot 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. |
format |
Report |
author |
Jiang Fengqing Hu Ruji Li Zhen Jiang, FQ, CAS, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China |
author_facet |
Jiang Fengqing Hu Ruji Li Zhen Jiang, FQ, CAS, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China |
author_sort |
Jiang Fengqing |
title |
Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004 |
title_short |
Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004 |
title_full |
Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004 |
title_fullStr |
Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004 |
title_full_unstemmed |
Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004 |
title_sort |
variations and trends of the freezing and thawing index along the qinghai-xizang railway for 1966-2004 |
publishDate |
2008 |
url |
http://ir.xjlas.org/handle/365004/10250 |
long_lat |
ENVELOPE(-59.828,-59.828,-63.497,-63.497) |
geographic |
Kendall |
geographic_facet |
Kendall |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
JOURNAL OF GEOGRAPHICAL SCIENCES Jiang Fengqing; Hu Ruji; Li Zhen.Variations and trends of the freezing and thawing index along the Qinghai-Xizang Railway for 1966-2004,JOURNAL OF GEOGRAPHICAL SCIENCES,2008,18(1):40618 http://ir.xjlas.org/handle/365004/10250 |
_version_ |
1766166397173366784 |