气候变化领域集成服务门户(CCPortal): Thermal-moisture dynamics and thermal stability of active layer in response to wet/dry conditions in the central region of the Qinghai-Tibet Plateau, China

CCPortal

DOI	10.1016/j.rcar.2023.04.002
	Thermal-moisture dynamics and thermal stability of active layer in response to wet/dry conditions in the central region of the Qinghai-Tibet Plateau, China
	Zhang, MingLi; Zhou, ZhiXiong; Wen, Zhi; Zhou, FengXi; Ma, Zhao; Lei, BingBing
发表日期	2023
ISSN	2097-1583
EISSN	2949-7302
起始页码	27
结束页码	38
卷号	15 期号:1
英文摘要	The amount of rainfall varies unevenly in different regions of the Qinghai-Tibet Plateau, with some regions becoming wetter and others drier. Precipitation has an important impact on the process of surface energy balance and the energy-water transfer within soils. To clarify the thermal-moisture dynamics and thermal stability of the active layer in permafrost regions under wet/dry conditions, the verified water-vapour-heat coupling model was used. Changes in the surface energy balance, energy-water transfer within the soil, and thickness of the active layer were quantitatively analyzed. The results demonstrate that rainfall changes significantly affect the Bowen ratio, which in turn affects surface energy exchange. Under wet/dry conditions, there is a positive correlation between rainfall and liquid water flux under the hydraulic gradient; water vapour migration is the main form under the temperature gradient, which indicates that the influence of water vapour migration on thermalmoisture dynamics of the active layer cannot be neglected. Concurrently, regardless of wet or dry conditions, disturbance of the heat transport by conduction caused by rainfall is stronger than that of convection by liquid water. In addition, when rainfall decreases by 1.5 times (212 mm) and increases by 1.5 times (477 mm), the thickness of the active layer increases by 0.12 m and decreases by 0.21 m, respectively. The results show that dry conditions are not conducive to the preservation of frozen soil; however, wet conditions are conducive to the preservation of frozen soil, although there is a threshold value. When this threshold value is exceeded, rainfall is unfavourable for the development of frozen soil.
关键词	Active layer Wet dry conditions Qinghai-Tibet Plateau (QTP)Thermal-moisture dynamics Permafrost thermal stability Numerical modelling
英文关键词	SOIL TEMPERATURES; HEAT-TRANSPORT; CLIMATE-CHANGE; COUPLED WATER; PERMAFROST; VAPOR; EVAPORATION; IMPACT; ZONE
WOS研究方向	Geography, Physical
WOS记录号	WOS:001017381000001
来源期刊	RESEARCH IN COLD AND ARID REGIONS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283015
作者单位	Lanzhou University of Technology; Chinese Academy of Sciences; Gansu Academy of Sciences; Lanzhou Jiaotong University
推荐引用方式 GB/T 7714	Zhang, MingLi,Zhou, ZhiXiong,Wen, Zhi,et al. Thermal-moisture dynamics and thermal stability of active layer in response to wet/dry conditions in the central region of the Qinghai-Tibet Plateau, China[J],2023,15(1).
APA	Zhang, MingLi,Zhou, ZhiXiong,Wen, Zhi,Zhou, FengXi,Ma, Zhao,&Lei, BingBing.(2023).Thermal-moisture dynamics and thermal stability of active layer in response to wet/dry conditions in the central region of the Qinghai-Tibet Plateau, China.RESEARCH IN COLD AND ARID REGIONS,15(1).
MLA	Zhang, MingLi,et al."Thermal-moisture dynamics and thermal stability of active layer in response to wet/dry conditions in the central region of the Qinghai-Tibet Plateau, China".RESEARCH IN COLD AND ARID REGIONS 15.1(2023).