干旱区生态环境知识资源中心(Arid): Effects of soilmoisture, net radiation, and atmospheric vapor pressure deficit on surface evaporation fraction at a semi-arid grass site

Arid

DOI	10.1016/j.scitotenv.2022.157890
	Effects of soilmoisture, net radiation, and atmospheric vapor pressure deficit on surface evaporation fraction at a semi-arid grass site
	Tong, Bing; Guo, Jianping; Xu, Hui; Wang, Yinjun; Li, Huirong; Bian, Lingen; Zhang, Jian; Zhou, Shenghui
通讯作者	Guo, JP
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2022
卷号	849
英文摘要	Surface energy partitioning is one of the most important aspects of the land-atmosphere coupling. The objective of this study is to examine how soil moisture (SM) and atmospheric conditions (net radiation, Rn and vapor pressure deficit, VPD) affect surface evaporation fraction (EF, determined by LE/(LE + H), where LE and H are latent and sensible heat flux, respectively) with measurements at a semi-arid grass site in China during the mid-growing season, 2020. The three factors (SM, Rn, and VPD) were divided into different levels, and then their effects on EF were investigated qualitatively using a combinatorial stratification method and quantificationally using a path analysis. Generally, the results indicated that the effect of one factor of SM, Rn and VPD on EF was influenced by the other two factors. EF tended to increase with increasing SM. Increased VPD (Rn) enhanced (weakened) the SM-EF relationship. When soil was dry, EF tended to decrease with increasing VPD; when soil was wet, EF initially levelled off and then decreased with increasing VPD. Increased Rn enhanced (weakened) the positive (negative) effect of VPD on EF when soil was wet (dry). In terms of Rn effect, EF tended to decrease as Rn increases. Further, path analysis suggested that SM, Rn, and VPD not only directly affected EF, but also indirectly affected EF, mainly through canopy conductance (Gs) and temperature difference between land surface and air (Delta T). The direct effect of SM accounted for >50 % of its total effect on EF, while the total effects of Rn and VPD on EF were dominated by their indirect effects. These observational evidences may have implications for improving representation of land-atmosphere coupling in atmospheric general circulation models over the semi-arid regions covered by grass.
英文关键词	Surface energy partitioning Soil water condition Atmospheric conditions Grassland
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000857121700013
WOS关键词	ENERGY-BALANCE CLOSURE ; SOIL-MOISTURE ; CARBON-DIOXIDE ; UNITED-STATES ; WATER ; EVAPOTRANSPIRATION ; EXCHANGE ; MODEL ; PRECIPITATION ; CLOUDINESS
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/2XILL650/394403
推荐引用方式 GB/T 7714	Tong, Bing,Guo, Jianping,Xu, Hui,et al. Effects of soilmoisture, net radiation, and atmospheric vapor pressure deficit on surface evaporation fraction at a semi-arid grass site[J],2022,849.
APA	Tong, Bing.,Guo, Jianping.,Xu, Hui.,Wang, Yinjun.,Li, Huirong.,...&Zhou, Shenghui.(2022).Effects of soilmoisture, net radiation, and atmospheric vapor pressure deficit on surface evaporation fraction at a semi-arid grass site.SCIENCE OF THE TOTAL ENVIRONMENT,849.
MLA	Tong, Bing,et al."Effects of soilmoisture, net radiation, and atmospheric vapor pressure deficit on surface evaporation fraction at a semi-arid grass site".SCIENCE OF THE TOTAL ENVIRONMENT 849(2022).