A Scheme to Estimate Diurnal Cycle of Evapotranspiration from Geostationary Meteorological Satellite Observations

doi:10.3390/w12092369

	A Scheme to Estimate Diurnal Cycle of Evapotranspiration from Geostationary Meteorological Satellite Observations
	Lu, Jing 1; Jia, Li 1; Zheng, Chaolei 1; Tang, Ronglin 2; Jiang, Yazhen 2
刊名	WATER
	2020-09-01
卷号	12 期号:9 页码:18
关键词	diurnal cycle of evapotranspiration geostationary meteorological satellite surface energy balance ETMonitor model FLUXNET2015
DOI	10.3390/w12092369
通讯作者	Lu, Jing(lujing@aircas.ac.cn)
英文摘要	The diurnal cycle of evapotranspiration (ET) is significant in studying the dynamics of land-atmosphere interactions. The diurnal ET cycle can be considered as an indicator of dry/wet surface conditions. However, the accuracy of current models in estimating the diurnal ET cycle is generally low. This study developed an improved scheme to estimate the diurnal cycle of ET by solving the surface energy balance equation combined with simplified parameterization, with daily ET as the constraint. Meteosat Second Generation (MSG) land surface temperature, and longwave and shortwave radiation products were the primary inputs. Daily ET was from the remote sensing-based ETMonitor model. The estimated instantaneous (30 min) ET from the improved scheme outperformed the official MSG instantaneous ET product when compared with in situ half-hourly measurements at 35 flux sites from the FLUXNET2015 dataset, and was also comparable with European Center for Medium-Range Weather Forecasts (ECMWF) ERA5 ET data, with an R-2 of 0.617 and root mean square error (RMSE) of 65.8 W/m(2) for the improved scheme. Results were largely improved compared with those without daily ET as the constraint. The improved method was stable for the estimation of ET's diurnal cycle at the similar atmospheric conditions and the accuracy was comparative at different land cover surfaces. Errors in the input variables and the simplification of surface heat flux parameterization affected surface energy balance closure, which can lead to instability of the solution of constants in the simplified parameterization and further to the uncertainty of ET's diurnal cycle estimation. Measurement errors, different source areas in measured variables, and inconsistent spatial representativeness between remote sensing and site measurements also impacted the evaluation.
资助项目	National Key Research and Development Program of China[2017YFC0405802] ; National Natural Science Foundation of China[41501405] ; National Natural Science Foundation of China[41801346] ; National Natural Science Foundation of China[41701495]
WOS关键词	SURFACE-ENERGY FLUXES ; EVAPORATION ; WATER ; TEMPERATURE
WOS研究方向	Water Resources
语种	英语
出版者	MDPI
WOS记录号	WOS:000581714900001
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/157185]
专题	中国科学院地理科学与资源研究所
通讯作者	Lu, Jing
作者单位	1.Chinese Acad Sci, Aerosp Informat Res Inst, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Lu, Jing,Jia, Li,Zheng, Chaolei,et al. A Scheme to Estimate Diurnal Cycle of Evapotranspiration from Geostationary Meteorological Satellite Observations[J]. WATER,2020,12(9):18.
APA	Lu, Jing,Jia, Li,Zheng, Chaolei,Tang, Ronglin,&Jiang, Yazhen.(2020).A Scheme to Estimate Diurnal Cycle of Evapotranspiration from Geostationary Meteorological Satellite Observations.WATER,12(9),18.
MLA	Lu, Jing,et al."A Scheme to Estimate Diurnal Cycle of Evapotranspiration from Geostationary Meteorological Satellite Observations".WATER 12.9(2020):18.