干旱区生态环境知识资源中心(Arid): The changing permafrost environment under desertification and the heat transfer mechanism in the Qinghai-Tibetan Plateau

Arid

DOI	10.1016/j.jenvman.2024.122055
	The changing permafrost environment under desertification and the heat transfer mechanism in the Qinghai-Tibetan Plateau
	Lan, Tianli; Lai, Yuanming; Gao, Jianqiang; Luo, Xiaoxiao; Ma, Qinguo
通讯作者	Ma, QG
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2024
卷号	367
英文摘要	With the development of desertification in the Qinghai-Tibet Plateau (QTP), aeolian sand becomes the remarkable local factor affecting the thermal state of permafrost along the Qinghai-Tibet Engineering Corridor (QTEC). In this study, a model experiment was conducted to analyze the impact of thickness and water content of aeolian sand on its thermal effect, and a hydro-thermo-vapor coupling model of frozen soil was carried out to reveal the heat transfer mechanism of the aeolian sand layer (ASL) with different thicknesses and its hydrothermal effect on permafrost. The results indicate that: (1) ASL with the thickness larger than 80 cm has the property of converting precipitation into soil water. The thicker the ASL, the more precipitation infiltrates and accumulates in the soil layer. (2) The cooling effect of ASL on permafrost results from the lower net surface radiation, causing the annual average surface heat flux shifting from heat inflow to heat outflow. The warming effect of ASL on permafrost results from the increasing convective heat accompanying the infiltrated precipitation. (3) As the ASL thickens, the thermal effect of ASL on permafrost gradually shifts from the cooling effect dominated by heat radiation and heat conduction to the warming effect dominated by precipitation infiltration and heat convection. The warming effect of thick ASL on permafrost requires a certain amount of years to manifest, and the critical thickness is suggested to be larger than 120 cm.
英文关键词	Desertification Aeolian sand Permafrost Heat transfer Hydrothermal effect Qinghai-Tibetan Plateau
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001290390200001
WOS关键词	SURFACE ; RAILWAY ; CONDUCTIVITY ; REGION ; DESERT ; MODEL
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404493
推荐引用方式 GB/T 7714	Lan, Tianli,Lai, Yuanming,Gao, Jianqiang,et al. The changing permafrost environment under desertification and the heat transfer mechanism in the Qinghai-Tibetan Plateau[J],2024,367.
APA	Lan, Tianli,Lai, Yuanming,Gao, Jianqiang,Luo, Xiaoxiao,&Ma, Qinguo.(2024).The changing permafrost environment under desertification and the heat transfer mechanism in the Qinghai-Tibetan Plateau.JOURNAL OF ENVIRONMENTAL MANAGEMENT,367.
MLA	Lan, Tianli,et al."The changing permafrost environment under desertification and the heat transfer mechanism in the Qinghai-Tibetan Plateau".JOURNAL OF ENVIRONMENTAL MANAGEMENT 367(2024).