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DOI	10.1016/j.scitotenv.2021.148970
	Impact process and mechanism of summertime rainfall on thermal-moisture regime of active layer in permafrost regions of central Qinghai-Tibet Plateau
	Zhang, Mingli; Wen, Zhi; Li, Desheng; Chou, Yaling; Zhou, Zhixiong; Zhou, Fengxi; Lei, Bingbing
通讯作者	Wen, Z (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China.
发表日期	2021
ISSN	0048-9697
EISSN	1879-1026
卷号	796
英文摘要	Rainfall can potentially change upper thermal-moisture boundary conditions and influence the hydrological and thermal state of the active layer in permafrost regions. Studying the relationship between rainfall and ground temperature represents an emerging issue in permafrost engineering and environment but the interactive mechanisms of rainfall and the active layer are not well understood. This study aims to analyze the effects and mechanisms of summertime rainfall on the thermal-moisture dynamics of the active layer by field observations and simulation. The observation data demonstrated that frequent light rainfall events had a minor impact on the active layer, whereas consecutive rainfall events and heavy rainfall events had significant effects on soil temperature and water content. Moreover, the soil temperatures were more susceptible to summertime rainfall events. These rapidly cooled the shallow ground and delayed the temperature rise. Summertime rainfall significantly increased the surface latent heat flux, but decreased the net radiation, sensible heat flux, and soil surface heat flux. Rainfall also enhanced the amount of downward liquid water and water vapor, but the impact of rainfall on the increase in the convective heat transfer of the liquid water was lower than the decreases in the heat conduction flux, latent heat flux by vapor diffusion, and heat flux by convection of vapor. Thus, the reduction in the total soil heat flux caused by rainfall directly leads to a cooling effect on the soil temperature and delays the increase in soil temperature. The cooling effect of rainfall events may mitigate the warming rate and maintain the active layer at a relatively low temperature. The results provide new insights into understanding the inner mechanisms of the effect of rainfall on the active layer and on the possible long-term change trends of permafrost under increasing precipitation in the central Qinghai-Tibet Plateau. (c) 2021 Elsevier B.V. All rights reserved.
关键词	HEAT-TRANSPORT LAND-SURFACE GROUND SURFACE CLIMATE-CHANGE SNOW COVER INCREASED PRECIPITATION SOIL TEMPERATURES ASPHALT PAVEMENT LIQUID WATER DYNAMICS
英文关键词	Rainfall; Active layer; Heat transfer; Surface energy balance; Permafrost; Qinghai-Tibet Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000701140100001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254210
作者单位	[Zhang, Mingli; Chou, Yaling; Zhou, Zhixiong; Zhou, Fengxi; Lei, Bingbing] Lanzhou Univ Technol, Coll Civil Engn, Lanzhou 730050, Peoples R China; [Zhang, Mingli; Wen, Zhi] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Zhang, Mingli] Gansu Acad Sci, Geol Hazards Prevent Inst, Lanzhou 730000, Peoples R China; [Wen, Zhi] Lanzhou Jiaotong Univ, Coll Civil Engn, Lanzhou 730070, Peoples R China; [Li, Desheng] Shanghai Jiao Tong Univ, State Key Lab Ocean Engn, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Mingli,Wen, Zhi,Li, Desheng,et al. Impact process and mechanism of summertime rainfall on thermal-moisture regime of active layer in permafrost regions of central Qinghai-Tibet Plateau[J]. 中国科学院西北生态环境资源研究院,2021,796.
APA	Zhang, Mingli.,Wen, Zhi.,Li, Desheng.,Chou, Yaling.,Zhou, Zhixiong.,...&Lei, Bingbing.(2021).Impact process and mechanism of summertime rainfall on thermal-moisture regime of active layer in permafrost regions of central Qinghai-Tibet Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,796.
MLA	Zhang, Mingli,et al."Impact process and mechanism of summertime rainfall on thermal-moisture regime of active layer in permafrost regions of central Qinghai-Tibet Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 796(2021).