气候变化领域集成服务门户(CCPortal): Climate warming over the past half century has led to thermal degradation of permafrost on the Qinghai-Tibet Plateau

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DOI	10.5194/tc-12-595-2018
	Climate warming over the past half century has led to thermal degradation of permafrost on the Qinghai-Tibet Plateau
	Ran Y.; Li X.; Cheng G.
发表日期	2018
ISSN	19940416
卷号	12 期号:2
英文摘要	Air temperature increases thermally degrade permafrost, which has widespread impacts on engineering design, resource development, and environmental protection in cold regions. This study evaluates the potential thermal degradation of permafrost over the Qinghai-Tibet Plateau (QTP) from the 1960s to the 2000s using estimated decadal mean annual air temperatures (MAATs) by integrating remote-sensing-based estimates of mean annual land surface temperatures (MASTs), leaf area index (LAI) and fractional snow cover values, and decadal mean MAAT date from 152 weather stations with a geographically weighted regression (GWR). The results reflect a continuous rise of approximately 0.04 °C a-1 in the decadal mean MAAT values over the past half century. A thermal-condition classification matrix is used to convert modelled MAATs to permafrost thermal type. Results show that the climate warming has led to a thermal degradation of permafrost in the past half century. The total area of thermally degraded permafrost is approximately 153.76 × 104 km2, which corresponds to 88 % of the permafrost area in the 1960s. The thermal condition of 75.2 % of the very cold permafrost, 89.6 % of the cold permafrost, 90.3 % of the cool permafrost, 92.3 % of the warm permafrost, and 32.8 % of the very warm permafrost has been degraded to lower levels of thermal condition. Approximately 49.4 % of the very warm permafrost and 96 % of the likely thawing permafrost has degraded to seasonally frozen ground. The mean elevations of the very cold, cold, cool, warm, very warm, and likely thawing permafrost areas increased by 88, 97, 155, 185, 161, and 250 m, respectively. The degradation mainly occurred from the 1960s to the 1970s and from the 1990s to the 2000s. This degradation may lead to increased risks to infrastructure, reductions in ecosystem resilience, increased flood risks, and positive climate feedback effects. It therefore affects the well-being of millions of people and sustainable development at the Third Pole. © Author(s) 2018.
学科领域	air temperature; climate feedback; environmental protection; frozen ground; land surface; remote sensing; resource development; snow cover; sustainable development; China; Qinghai-Xizang Plateau
语种	英语
scopus关键词	air temperature; climate feedback; environmental protection; frozen ground; land surface; remote sensing; resource development; snow cover; sustainable development; China; Qinghai-Xizang Plateau
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119218
作者单位	Key Laboratory of Remote Sensing of Gansu Province, Heihe Remote Sensing Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China; Institute of Urban Studies, Shanghai Normal University, Shanghai, 200234, China
推荐引用方式 GB/T 7714	Ran Y.,Li X.,Cheng G.. Climate warming over the past half century has led to thermal degradation of permafrost on the Qinghai-Tibet Plateau[J],2018,12(2).
APA	Ran Y.,Li X.,&Cheng G..(2018).Climate warming over the past half century has led to thermal degradation of permafrost on the Qinghai-Tibet Plateau.Cryosphere,12(2).
MLA	Ran Y.,et al."Climate warming over the past half century has led to thermal degradation of permafrost on the Qinghai-Tibet Plateau".Cryosphere 12.2(2018).