气候变化领域集成服务门户(CCPortal): Current state and past changes in frozen ground at the Third Pole: A research synthesis

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DOI	10.1016/j.accre.2022.09.004
	Current state and past changes in frozen ground at the Third Pole: A research synthesis
	Ran, You-Hua; Li, Xin; Che, Tao; Wang, Bing-Quan; Cheng, Guo-Dong
发表日期	2022
ISSN	1674-9278
起始页码	632
结束页码	641
卷号	13 期号:5 页码:10
英文摘要	The thermal state of frozen ground and its changes are important for understanding environmental change and supporting related applications to the Earth's Third Pole, which is a hotspot area for science research. However, challenges remain in data and modelling, meaning that much information is unavailable, especially for the entire Third Pole region. Here, we provided basic statistical data regarding the current state of frozen ground and its changes over the 1960s-2010s across the entire Third Pole by integrating nearly all currently available ground observation data and high-quality spatial data using machine learning models and existing high-quality frozen ground data products. The results show that the current (2000-2018) areal extents of permafrost and seasonally frozen ground in the Third Pole are approximately 1.27 x 106 km2 (1.15 x 106 to 1.39 x 106 km2) and 2.59 x 106 km2, accounting for 28% and 58%, respectively. The areal extent of permafrost region is approximately 50% (23%-93%) larger than that of permafrost area (land underlain by permafrost), especially in some early maps. The corresponding regional average of the mean annual ground temperature is approximately -1.51 degrees C (-1.75 to -1.27 degrees C) in the permafrost area. The regional average of active layer thickness overlying the permafrost and the maximum frost depth for regions of seasonally frozen ground are 235 cm (233-237 cm) and 92 cm, respectively. From the 1960s to the 2010s, on average, permafrost in the Third Pole warmed at a rate of 0.17 degrees C per decade, which was associated with increases in the maximum thaw depth at a rate of 4.42 cm per decade. The regional average of the maximum frost depth declined at a rate of 2.34 cm per decade over the same period. This synthesis highlights the differences between the two terms (permafrost region and permafrost area) and provides crucial information for frozen ground in the Third Pole with higher accuracy for the scientific community and the public.
英文关键词	High mountain Asia; Permafrost; Seasonally frozen ground; Ground temperature; Active layer thickness; Maximum frost depth
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000874699900002
来源期刊	ADVANCES IN CLIMATE CHANGE RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273949
作者单位	Chinese Academy of Sciences; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Ran, You-Hua,Li, Xin,Che, Tao,et al. Current state and past changes in frozen ground at the Third Pole: A research synthesis[J]. 中国科学院青藏高原研究所,2022,13(5):10.
APA	Ran, You-Hua,Li, Xin,Che, Tao,Wang, Bing-Quan,&Cheng, Guo-Dong.(2022).Current state and past changes in frozen ground at the Third Pole: A research synthesis.ADVANCES IN CLIMATE CHANGE RESEARCH,13(5),10.
MLA	Ran, You-Hua,et al."Current state and past changes in frozen ground at the Third Pole: A research synthesis".ADVANCES IN CLIMATE CHANGE RESEARCH 13.5(2022):10.