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	Using ERA-Interim reanalysis dataset to assess the changes of ground surface freezing and thawing condition on the Qinghai-Tibet Plateau
	Qin, Yanhui; Wu, Tonghua; Li, Ren; Yu, Wenjun; Wang, Tianye; Zhu, Xiaofan; Wang, Weihua; Hu, Guojie; Tian, Liming
刊名	ENVIRONMENTAL EARTH SCIENCES
	2016-05-01
卷号	75期号:9页码:13
关键词	Permafrost Freezing and thawing conditions ERA-Interim reanalysis dataset Qinghai-Tibet Plateau
ISSN号	1866-6280
DOI	10.1007/s12665-016-5633-2
通讯作者	Wu, Tonghua(thuawu@lzb.ac.cn)
英文摘要	It is important to assess the freezing and thawing condition of ground surface for understanding the impacts of frozen ground on surface and subsurface hydrology, the surface energy and moisture balance, ecosystem conservation, and engineering construction on the Qinghai-Tibet Plateau (QTP). However, assessing the changes of ground surface freezing and thawing condition on the QTP still remains a challenge owing to data sparseness and discontinuous observations. The annual ground surface freezing index (GFI) and ground surface thawing index (GTI) could be used to predict changes of the thermal regime of permafrost and can be good indicators of climate change on the QTP, which has important engineering applications. In this study, we first calibrated the reanalysis ground surface temperature (GST) data using the methods of elevation correction on the QTP. After calibration, the quality of reanalysis data has been improved significantly. For the annual time series, the root mean square error decreased from 7.7 to 1.6 degrees C, the absolute value of mean bias error decreased from 7.5 to 0.0 degrees C, and the correlation coefficient increased from 0.62 to 0.86. Second, we estimated the annual and seasonal spatial distributions of GST. The spatial distribution of spring and autumn GST closely resembled the annual mean pattern. The long-term mean GFI and GTI from the calibrated reanalysis dataset were 1322.3 and 2027.9 degrees C/day, respectively. The GFI and GTI were presented as latitude and elevation zonation; it can also be seen that permafrost mostly occurred in the high GFI and low GTI regions. Estimating the GFI and GTI precisely will be utilized to model the permafrost distribution and estimate active layer thickness in the future.
收录类别	SCI
WOS关键词	ACTIVE LAYER ; CLIMATE-CHANGE ; SNOW COVER ; CHINA ; PERMAFROST ; VARIABILITY ; TEMPERATURE ; DEGRADATION ; PRECIPITATION ; 20TH-CENTURY
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000376030100102
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557335
专题	寒区旱区环境与工程研究所
通讯作者	Wu, Tonghua
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Cryosphere Sci, Cryosphere Res Stn Qinghai Tibet Plateau, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Qin, Yanhui,Wu, Tonghua,Li, Ren,et al. Using ERA-Interim reanalysis dataset to assess the changes of ground surface freezing and thawing condition on the Qinghai-Tibet Plateau[J]. ENVIRONMENTAL EARTH SCIENCES,2016,75(9):13.
APA	Qin, Yanhui.,Wu, Tonghua.,Li, Ren.,Yu, Wenjun.,Wang, Tianye.,...&Tian, Liming.(2016).Using ERA-Interim reanalysis dataset to assess the changes of ground surface freezing and thawing condition on the Qinghai-Tibet Plateau.ENVIRONMENTAL EARTH SCIENCES,75(9),13.
MLA	Qin, Yanhui,et al."Using ERA-Interim reanalysis dataset to assess the changes of ground surface freezing and thawing condition on the Qinghai-Tibet Plateau".ENVIRONMENTAL EARTH SCIENCES 75.9(2016):13.

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