Evapotranspiration paradox at a semi-arid location in India

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

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Abstract

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.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Reference crop evapotranspiration; semi-arid tropics; gtrends; watershed
Agro Tags:	<b>Agrotags</b> - NOT-AVAILABLE<br><b>Fishtags</b> - NOT-AVAILABLE<br><b>Geopoliticaltags</b> - NOT-AVAILABLE
Subjects:	Others > Watershed Management
Depositing User:	Users 6 not found.
Date Deposited:	28 Jul 2011 09:07
Last Modified:	28 Jul 2011 09:09
URI:	http://oar.icrisat.org/id/eprint/116
Official URL:
Projects:	UNSPECIFIED
Funders:	Sir Dorabji Tata Trust, Sir Ratan Tata Trust
Acknowledgement:	The financial support provided by Sir Dorabji Tata Trust; Sir Ratan Tata Trust is gratefully acknowledged
Links:	Author

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