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Evapotranspiration paradox at a semi-arid location in India

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Relation http://oar.icrisat.org/116/
 
Title Evapotranspiration paradox at a semi-arid location in India
 
Creator Rao, A V R K
Wani, S P
 
Subject Watershed management
 
Description Paradox of decreasing evaporation and evapotranspiration under increasing temperature conditions
in the semi-arid tropics assumes greater importance as agriculture in these areas is more vulnerable to
climate change. Trends in annual reference crop evapotranspiration (ETo) at Patancheru, Andhra Pradesh
indicated a reduction of about 200 mm from 1850 mm to 1650 mm during the past 35 years. Contribution of
energy balance term to the total ETo has shown an increasing trend while aerodynamic term has a
decreasing trend. Wind speed has shown a strong negative trend leading to the dramatic fall of the
aerodynamic term and consequently the ETo. Rate of reduction in evapotranspiration demand was about
10% for kharif (Jun-Oct) and about 14% for rabi (Nov-Feb). At Patancheru, measured temperature and solar
radiation showed opposite trends and at locations where no measured solar radiation data available and if
solar radiation is estimated from air temperature alone for use as an input in crop modelling, outputs under
such conditions need to be interpreted with caution. Present study highlights the need for climate change
impact studies at a local level in addition to those based on regional and global circulation models.
 
Publisher Association of Agrometeorologists
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/116/1/JouAgromet13_1_3-8_2011.pdf
Rao, A V R K and Wani, S P (2011) Evapotranspiration paradox at a semi-arid location in India. Journal of Agrometeorology, 13 (1). pp. 3-8. ISSN 0972-1665