DOI: 10.1002/jgrd.50259
论文题名: A hybrid dual-source scheme and trapezoid framework-based evapotranspiration model (HTEM) using satellite images: Algorithm and model test
作者: Yang Y. ; Shang S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 5 起始页码: 2284
结束页码: 2300
语种: 英语
英文关键词: evaporation
; hybrid dual-source scheme
; satellite remote sensing
; transpiration
; trapezoid framework
Scopus关键词: Atmospheric temperature
; Estimation
; Evaporation
; Evapotranspiration
; Heat flux
; Phase transitions
; Remote sensing
; Satellite imagery
; Soil moisture
; Space optics
; Surface properties
; Transpiration
; Water supply
; Dual source
; Evapotranspiration models
; Landsat Thematic Mapper
; Mean absolute percentage error
; Meteorological observation
; Moderate resolution imaging spectroradiometer
; Satellite remote sensing
; trapezoid framework
; Soil surveys
; algorithm
; error analysis
; evapotranspiration
; growing season
; Landsat
; latent heat flux
; model test
; satellite imagery
; sensible heat flux
; surface temperature
; Terra (satellite)
; China
; Iowa
; North China Plain
; United States
英文摘要: Satellite remote sensing techniques are widely considered as the most promising way to estimate evapotranspiration (ET) over large geographic extents. In this study, a hybrid dual-source scheme and trapezoid framework-based evapotranspiration model (HTEM) is developed to map evapotranspiration from satellite imagery. It adopts a theoretically determined vegetation index/land surface temperature trapezoidal space to decompose bulk radiative surface temperature into component temperatures (soil and canopy) and uses a hybrid dual-source scheme of the layer approach and patch approach to partition net radiation and estimate sensible and latent fluxes separately from the soil and canopy. The proposed model was tested at the Soil Moisture-Atmosphere Coupling Experiment (SMACEX) site in central Iowa, USA, for 3 days during the campaign in 2002 using Landsat Thematic Mapper/Enhanced Thematic Mapper Plus (TM/ETM+) data, and at the Weishan flux site in the North China Plain during the main growing season of 2007 with Moderate Resolution Imaging Spectroradiometer Terra images. Results indicate that HTEM is capable of estimating latent heat flux (LE) with mean absolute percentage errors of 6.4% and 11.2% for the SMACEX and the Weishan sites, respectively. In addition, the model was found to be able to give reasonable evaporation and transpiration partitioning at both sites. Compared with other models, HTEM generally produced better sensible and latent flux estimates at the two sites and had comparable abilities in estimating net radiation and ground heat flux. Sensitivity analysis suggests that HTEM is most sensitive to temperature variables and less sensitive to other meteorological observations and parameters. © 2013. 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/63882
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China; Department of Hydraulic Engineering, Tsinghua University, Beijing, China
Recommended Citation:
Yang Y.,Shang S.. A hybrid dual-source scheme and trapezoid framework-based evapotranspiration model (HTEM) using satellite images: Algorithm and model test[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(5)