A simple surface energy balance to derive evapotranspiration from remote sensing and conventional meteorological observations |
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| Authors: | C. V. Srinivas K. P. R. Vittal Murty Y. V. N. Krishna Murty |
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| Affiliation: | 1.Atmospheric Studies Section, Safety Physics Division,Indira Gandhi Centre for Atomic Research,Kalpakkam,India;2.Department of Meteorology and Oceanography,Andhra University, Visakhapatnam,India;3.Deparment of Space,Regional Remote Sensing Service Centre (RRSSC),Nagpur,India |
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| Abstract: | Monthly mean measurements of surface temperature, albedo and normalized difference vegetation index (NDVI) of NOAA AVHRR are processed for Maharashtra. These data are used in combination with monthly average surface meteorological observations in a surface energy balance model to estimate monthly mean actual evapotranspiration (AET) from different climatic zones of Maharasthra,. India. AET is estimated between April and December months for two contrasting monsoons in 1992 and 1995. Estimates reasonably agree with pan evaporation data during growing season and with AET estimated from water balance procedure. AET is low in semi-arid dry land areas of central Maharashtra and significantly high in the humid-perhumid western ghat region and subhumid eastern Maharashtra region. The modeled evapotranspiration show the influence of seasonal vegetation in different climatic zones from the region. The method can be used to obtain large-scale evapotranspiration with minimum ground observations. |
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