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DOI10.1016/j.accre.2020.10.003
Dynamics of freezing/thawing indices and frozen ground from 1900 to 2017 in the upper Brahmaputra River Basin; Tibetan Plateau
LIU L.; LUO D.-L.; WANG L.; HUANG Y.-D.; CHEN F.-F.
Date Issued2020
ISSN1674-9278
Other AbstractDynamics of the frozen ground are key to understand the changes of eco-environment in cold regions, especially for areas with limited field observations. In this study, we analyzed the spatial and temporal variations of the ground surface freezing and thawing indices from 1900 to 2017 for the upper Brahmaputra River (also called the Yarlung Zangbo River in China) Basin (UBRB), southwestern Tibetan Plateau, with the air freezing and thawing indices using the University of Delaware (UDEL) monthly gridded air temperature dataset. The abrupt change years for air freezing index (AFI) and ground surface freezing index (GFI) were detected in 1999 and 2002, respectively, and for both air thawing index (ATI) and ground surface thawing index (GTI) were 2009. With the air temperature rising at a rate of 0.006 °C per year over 1900–2017, the AFI and GFI decreased at a rate of −0.1 °C d per year, while the ATI and GTI increased at rates of 0.3 and 0.5 °C d per year before the abrupt change year, respectively; all changing trends of freezing/thawing indices increased after the abrupt year, which was −2.9, −0.8, 7.3, and 21.7 °C d per year for the AFI, GFI, ATI, and GTI, respectively. We utilized the surface frost number model to obtain the dynamics of the frozen ground over the UBRB. When the empirical coefficient of E was assigned to 1.2, the simulated frozen ground occupied about 53.2% of the whole UBRB in the 1990s, which agreed well with the existing permafrost map published in 1996. The area of frozen ground accounts for 51.5%–54.5% of the UBRB during 1900–2017. This result may facilitate further studies of the multi-interactions among the frozen ground and relevant eco-environment, such as the air-ground surface energy exchange, hydrological cycles, and changes of the active layer thickness over the UBRB. © 2020 National Climate Center (China Meteorological Administration)
Language英语
journalAdvances in Climate Change Research
Source Publication中国科学院西北生态环境资源研究院
Document Type期刊论文
Identifierhttp://gcip.llas.ac.cn/handle/2XKMVOVA/168746
AffiliationState Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 320 Donggang West Road, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 16 Cuilin Road, Chaoyang District, Beijing, 100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, 16 Cuilin Road, Chaoyang District, Beijing, 100101, China
Recommended Citation
GB/T 7714
LIU L.,LUO D.-L.,WANG L.,et al. Dynamics of freezing/thawing indices and frozen ground from 1900 to 2017 in the upper Brahmaputra River Basin; Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2020.
APA LIU L.,LUO D.-L.,WANG L.,HUANG Y.-D.,&CHEN F.-F..(2020).Dynamics of freezing/thawing indices and frozen ground from 1900 to 2017 in the upper Brahmaputra River Basin; Tibetan Plateau.Advances in Climate Change Research.
MLA LIU L.,et al."Dynamics of freezing/thawing indices and frozen ground from 1900 to 2017 in the upper Brahmaputra River Basin; Tibetan Plateau".Advances in Climate Change Research (2020).
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