A revised temporal scaling method to yield better ET estimates at a regional scale (EI)

CORC > 寒区旱区环境与工程研究所 > 中科院寒区旱区环境与工程研究所（未分类） > 期刊论文

	A revised temporal scaling method to yield better ET estimates at a regional scale (EI)
	Song Y.; Ma M.; Jin L.; Wang X.
刊名	Remote Sensing
	2015
卷号	7 期号:5 页码:6433-6453
英文摘要	This study presents a revised temporal scaling method based on a detection algorithm for the temporal stability of the evaporative fraction (EF) to estimate total daytime evapotranspiration (ET) at a regional scale. The study area is located in the Heihe River Basin, which is the second largest inland river basin in China. The remote sensing data and field observations used in this study were obtained from the Heihe Watershed Allied Telemetry Experimental Research (HiWATER) project. The half-hourly EF values (EFsupEC/sup) calculated using meteorological observations from an eddy covariance (EC) system and an automatic meteorological station (AMS) represented the diurnal pattern of the EF across the majority of the study area. The remotely sensed instantaneous midday EF (EFinfASTER/inf), which indicates the spatial distribution of the midday EF over the entire study area, was calculated from an Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image. The temporal stability of EFsupEC/sup was examined using a detection algorithm. Intervals with inconsistent EFsupEC/sup values were distinguished from those with consistent EFsupEC/sup values; the total daytime ET (from 9:00 to 19:00) within these interval types was integrated separately. Validation of the total daytime ET at the satellite pixel scale was conducted using measurements from17 EC towers. Using the detection algorithm for the temporal stability of the EF and dynamic adjustment, the revised temporal scaling method resulted in a root-mean-square error (RMSE) of 0.54 (mmdsup-1/sup), a mean relative error (MRE) of 7.26% and a correlation coefficient (Corr.) of 0.81; all of these values were superior to those of the two other methods (i.e., the constant EF and variable EF methods). The revised method easily extends to other areas and exhibits a superior performance in flat and regularly-irrigated farmlands at the regional scale. 2015 by the authors.
收录类别	EI
语种	英语
内容类型	期刊论文
源URL	[http://ir.casnw.net/handle/362004/27157]
专题	寒区旱区环境与工程研究所_中科院寒区旱区环境与工程研究所（未分类）_期刊论文
推荐引用方式 GB/T 7714	Song Y.,Ma M.,Jin L.,et al. A revised temporal scaling method to yield better ET estimates at a regional scale (EI)[J]. Remote Sensing,2015,7(5):6433-6453.
APA	Song Y.,Ma M.,Jin L.,&Wang X..(2015).A revised temporal scaling method to yield better ET estimates at a regional scale (EI).Remote Sensing,7(5),6433-6453.
MLA	Song Y.,et al."A revised temporal scaling method to yield better ET estimates at a regional scale (EI)".Remote Sensing 7.5(2015):6433-6453.