气候变化领域集成服务门户(CCPortal): Key evidence of the role of desertification in protecting the underlying permafrost in the Qinghai-Tibet Plateau

CCPortal

DOI	10.1038/srep15152
	Key evidence of the role of desertification in protecting the underlying permafrost in the Qinghai-Tibet Plateau
	Xie, Shengbo; Qu, Jianjun; Lai, Yuanming; Xu, Xiangtian; Pang, Yingjun
发表日期	2015
ISSN	2045-2322
卷号	5
英文摘要	Previous research has shown that the temperature of underlying permafrost decreases after the ground surface is covered with sand. No significant conclusions have yet been drawn that explain why this happens, because the heat transfer mechanism effects of the sand layer on the underlying permafrost remain unclear. These mechanisms were studied in the present work. We found that the upward shortwave radiation flux of the Qinghai-Tibet Plateau ground surface with a sand layer covering was higher than that of the surface without sand; thus, the atmospheric heat reflected by the sand layer is greater than that reflected by the surface without sand. Therefore, the net radiation of the surface with the sand layer is lower than that of the surface without sand, which reduces the heat available to warm the sand layer. Because sand is both a porous medium and a weak pervious conductor with poor heat conductivity, less heat is conducted through the sand layer to the underground permafrost than in soil without the sand deposition layer. This phenomenon results in a decrease in the ground temperature of the permafrost under the sand layer, which plays a key role in protecting the permafrost.
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS关键词	RAILWAY CONSTRUCTION ; THAWING PERMAFROST ; GROUND SURFACE ; SOIL ; TEMPERATURE ; CLIMATE ; ECOSYSTEM ; IMPACTS ; REGIONS ; RISK
WOS记录号	WOS:000362817300001
来源期刊	SCIENTIFIC REPORTS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239493
作者单位	[Xie, Shengbo; Qu, Jianjun; Lai, Yuanming] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Dunhuang Gobi & Desert Res Stn,Key Lab Desert & D, Lanzhou 730000, Peoples R China; [Xu, Xiangtian] Inner Mongolia Univ, Inst Transportat, Hohhot 010070, Peoples R China; [Pang, Yingjun] Chinese Acad Forestry, Inst Desertificat Studies, Beijing 100091, Peoples R China
推荐引用方式 GB/T 7714	Xie, Shengbo,Qu, Jianjun,Lai, Yuanming,et al. Key evidence of the role of desertification in protecting the underlying permafrost in the Qinghai-Tibet Plateau[J],2015,5.
APA	Xie, Shengbo,Qu, Jianjun,Lai, Yuanming,Xu, Xiangtian,&Pang, Yingjun.(2015).Key evidence of the role of desertification in protecting the underlying permafrost in the Qinghai-Tibet Plateau.SCIENTIFIC REPORTS,5.
MLA	Xie, Shengbo,et al."Key evidence of the role of desertification in protecting the underlying permafrost in the Qinghai-Tibet Plateau".SCIENTIFIC REPORTS 5(2015).