DOI: 10.3390/rs12030511
论文题名: Evaluation of evapotranspiration for exorheic catchments of china during the GRACE era: From a water balance perspective
作者: Zhong Y. ; Zhong M. ; Mao Y. ; Ji B.
刊名: Remote Sensing
ISSN: 20724292
出版年: 2020
卷: 12, 期: 3 语种: 英语
英文关键词: China
; Evapotranspiration
; Exorheic catchments
; Grace
; Terrestrial water storage changes
; Water balance
Scopus关键词: Catchments
; Climate models
; Digital storage
; Evapotranspiration
; Mean square error
; Runoff
; Water supply
; China
; Grace
; Gravity recovery and climate experiments
; Precipitation products
; Root mean square errors
; Terrestrial water storage
; Water balance
; Water balance equation
; Uncertainty analysis
英文摘要: Evapotranspiration (ET) is usually difficult to estimate at the regional scale due to scarce direct measurements. This study uses the water balance equation to calculate the regional ET with observations of precipitation, runoff, anci terrestrial water storage changes (TWSC) in nine exorheic catchments of China. We compared the regional ET estimates from a water balance perspective with and without considering TWSC (ETwb: ET estimates with considering TWSC, anci ETpq: ET estimates from precipitation minus runoff without considering TWSC). Results show that the regional annual ET ranges from 417.7 mm/yr to 831.5 mm/yr in the nine exorheic catchments based on the water balance equation. The impact of ignoring TWSC on calculating ET is notable, as the root mean square errors (RMSEs) of annual ET between ETwb and ETpq range from 12.0-105.8 mm/yr (2.6-12.7% in corresponding annual ET) among the exorheic catchments. We also compared the estimated regional ET with other ET products. Different precipitation products are assessed to explain the inconsistency between different ET products and regional ET from a water balance perspective. The RMSEs between ET estimates from Gravity Recovery and Climate Experiment (GRACE) and ET from land surface models can be reduced if the deviation of precipitation forcing data is considered. ET estimates from Global Land Evaporation Amsterdam Model (GLEAM) can be improved by reducing the uncertainty of precipitation forcing data in three semiarid catchments. This study emphasizes the importance of considering TWSC when calculating the regional ET using a water balance equation and provides more accurate ET estimates to help improve modeled ET results. © 2020 by the authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159792
Appears in Collections: 气候变化与战略
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作者单位: School of Geography and Information Engineering, China University of Geosciences (Wuhan), Wuhan, 430078, China; Artificial Intelligence School, Wuchang University of Technology, Wuhan, 430223, China; State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, 430077, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; School of Environment, Beijing Normal University, Beijing, 100875, China; Department of Navigation Engineering, Naval University of Engineering, Wuhan, 430033, China
Recommended Citation:
Zhong Y.,Zhong M.,Mao Y.,et al. Evaluation of evapotranspiration for exorheic catchments of china during the GRACE era: From a water balance perspective[J]. Remote Sensing,2020-01-01,12(3)