DOI: 10.1029/2018JD028371
Scopus记录号: 2-s2.0-85051705961
论文题名: The Uncertainty of Penman-Monteith Method and the Energy Balance Closure Problem
作者: Hao X. ; Zhang S. ; Li W. ; Duan W. ; Fang G. ; Zhang Y. ; Guo B.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 14 起始页码: 7433
结束页码: 7443
语种: 英语
英文关键词: latent heat flux of ET0 (LEp)
; net radiation (Rn)
; potential evaporation
; reference crop evapotranspiration
; surface energy balance
英文摘要: The Penman-Monteith (PM) method is considered the most accurate method for estimating reference crop evapotranspiration (ET0). However, the method has obvious flaws in energy balance closure. In this study, the changing trends between latent heat flux of ET0 (LEp) and surface net radiation (Rn) in China were analyzed based on observational data from 800 meteorological stations. The results showed that the multiyear average ratio of LEp/Rn was highest in the warm temperate zone and was lowest in the subfrigid zone of the Tibetan Plateau. Correspondingly, the values of LEp/Rn in these areas were ranged from 1.138 to 0.647. At the site scale, there were 61, 178, and 170 meteorological stations with daily average LEp/Rn values >1 during three periods (from January to April, May to August, and September to December, respectively). The ratio of LEp/Rn showed an obvious surface energy imbalance, and it was extremely obvious in northern China. Meanwhile, it is found that there was also great uncertainty of the ET0, which estimated based on the calculated and measured net radiation. In general, the uncertainty of ET0 was ranged from −0.955 to 1.028 mm/day and the average value of uncertainty was 0.154 mm/day. The uncertainty also showed obviously temporal variation, which was lower during April to October, but was higher in other times. The main cause of the energy balance closure problem was the overestimation of the aerodynamic component of ET0. In view of such situation, this study suggested the two ways to estimate ET0 for different regions. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113476
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China; Department of Geographic Information Science, Nanjing University, Nanjing, China; College of Geodesy and Geometrics, Shandong University of Science and Technology, Qingdao, China
Recommended Citation:
Hao X.,Zhang S.,Li W.,et al. The Uncertainty of Penman-Monteith Method and the Energy Balance Closure Problem[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(14)