气候变化领域集成服务门户(CCPortal): Determination of the asymmetric parameter in complementary relations of evaporation in alpine grasslands of the Tibetan Plateau

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DOI	10.1016/j.jhydrol.2021.127306
	Determination of the asymmetric parameter in complementary relations of evaporation in alpine grasslands of the Tibetan Plateau
	Wang, Liming; Tian, Fuqiang; Han, Songjun; Cui, Tong; Meng, Xianhong; Hu, Hongchang
通讯作者	Tian, FQ (通讯作者)，Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China. ; Han, SJ (通讯作者)，China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China.
发表日期	2022
ISSN	0022-1694
EISSN	1879-2707
卷号	605
英文摘要	Complementary equations have been widely applied to evaporation (E) estimation in poorly monitored areas and under changing conditions. It is essential to determine a priori the key parameter called the asymmetric parameter (or land surface parameter in the sigmoid equation) b for predictive application of complementary equations. A previous study (Wang et al., 2020a) suggested ecosystem mean b values at the global scale, which, however, exhibit significant variation for specific ecosystem types, especially for grasslands. This brings a challenge for accurate estimation of E. In this study, taking the alpine grassland ecosystem on the Tibetan Plateau (TP) as an example, eddy covariance data from 10 EC monitoring sites across TP were used to investigate b and its control factors. Our results show that 1) b ranges from 0.48 to 2.56 with a mean value of 1.52 +/- 0.65 (mean +/- standard deviation) in alpine grasslands of the TP, and b is significantly correlated (R-2 = 0.97, p-value < 0.01) with the mean annual surface soil water content, which results in an empirical formula to determine b; 2) the sigmoid generalized complementary equation aided by the estimated b exhibits a high efficiency of evaporation calculation with a mean Nash-Sutcliffe coefficient of 0.88 on the TP; and 3) a small perturbation in b could cause a high bias in the E estimation, especially in areas of low soil moisture. The proposed empirical formula to estimate b lays the foundation for accurate evaporation prediction on the TP under fast-changing conditions.
关键词	ATMOSPHERE-LAND INTERACTION CLIMATE-CHANGE EVAPOTRANSPIRATION PRINCIPLE WATER SYSTEM MODEL MANAGEMENT LANDSCAPE FLUXES
英文关键词	Evaporation; Sigmoid generalized complementary equation; Tibetan Plateau; Soil water content; Asymmetric parameter
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:000752487100004
来源期刊	JOURNAL OF HYDROLOGY
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/255090
作者单位	[Wang, Liming; Tian, Fuqiang; Cui, Tong; Hu, Hongchang] Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China; [Han, Songjun] China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China; [Meng, Xianhong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Land Surface Proc & Climate Change Cold &, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Wang, Liming,Tian, Fuqiang,Han, Songjun,et al. Determination of the asymmetric parameter in complementary relations of evaporation in alpine grasslands of the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2022,605.
APA	Wang, Liming,Tian, Fuqiang,Han, Songjun,Cui, Tong,Meng, Xianhong,&Hu, Hongchang.(2022).Determination of the asymmetric parameter in complementary relations of evaporation in alpine grasslands of the Tibetan Plateau.JOURNAL OF HYDROLOGY,605.
MLA	Wang, Liming,et al."Determination of the asymmetric parameter in complementary relations of evaporation in alpine grasslands of the Tibetan Plateau".JOURNAL OF HYDROLOGY 605(2022).