UNC-Chapel Hill GEOG 801 - Estimation of evaporative fraction and evapotranspiration from MODIS (10 pages)

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Estimation of evaporative fraction and evapotranspiration from MODIS



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Estimation of evaporative fraction and evapotranspiration from MODIS

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Lecture Notes


Pages:
10
School:
University of North Carolina at Chapel Hill
Course:
Geog 801 - Earth System Sciences/Physical Geography Research Seminar

Unformatted text preview:

RSE 06888 No of Pages 10 MODEL ARTICLE IN PRESS Remote Sensing of Environment xx 2007 xxx xxx www elsevier com locate rse Estimation of evaporative fraction and evapotranspiration from MODIS products using a complementary based model Virginia Venturini a Shafiqul Islam b Leticia Rodriguez a a b Facultad de Ingenier a y Ciencias H dricas Universidad Nacional del Litoral C C 217 Santa Fe 3000 Argentina Department of Civil and Environmental Engineering Tufts University 113 Anderson Hall Medford MA 02155 United States Received 16 February 2006 received in revised form 20 April 2007 accepted 21 April 2007 Abstract We present a new formulation to derive evaporative fraction EF and evapotranspiration ET maps from remotely sensed data without auxiliary relationships or site specific relationships This formulation is based on Granger s complementary relationship and Priestley Taylor s equation The proposed model eliminates the wind function and resistance parameters commonly applied to ET calculation by including a relative evaporation parameter ET Epot By combining this relative evaporation parameter Granger s complementary relationship and Priestley Taylor equation we obtain a simple equation to estimate ET We tested and validated the proposed formulation over the Southern Great Plains SGP region of the United States for seven clear sky days during March October 2003 MODIS Atmospheric and Land products were the only source of data used in this study Estimates of ET show an overall root mean square error and bias of 33 89 and 10 96 Wm 2 respectively Our results suggest that the proposed approach is robust and valid for a wide range of atmospheric and surface conditions 2007 Elsevier Inc All rights reserved Keywords Evapotranspiration Evaporative fraction Complementary relationship Priestley and Taylor 1 Introduction Many hydrologic modeling global circulation models and agricultural management applications require estimates of evapotranspiration ET and the evaporative



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