Links between Arctic Oscillation (AO) and inter-annual variability of Iranian evapotranspiration

Understanding the responding mechanism of reference evapotranspiration (ETo) to large-scale atmospheric circulation patterns is of particular concern in arid and semi-arid environments, where water resources scarcity constrains agriculture. This study investigates the statistical relationships betwe...

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Bibliographic Details
Published in:Quaternary International
Main Authors: Tabari, Hossein, Hosseinzadehtalaei, Parisa, Willems, Patrick
Format: Article in Journal/Newspaper
Language:English
Published: PERGAMON-ELSEVIER SCIENCE LTD 2014
Subjects:
ARTIFICIAL NEURAL-NETWORK
PRECIPITATION
TEMPERATURES
EQUATIONS
TREND
ENSO
PART
Arctic
Online Access:https://biblio.ugent.be/publication/01HV696PT4XBX7KKFQXCZTS34Q
http://hdl.handle.net/1854/LU-01HV696PT4XBX7KKFQXCZTS34Q
https://doi.org/10.1016/j.quaint.2014.02.011
https://biblio.ugent.be/publication/01HV696PT4XBX7KKFQXCZTS34Q/file/01HV77M13N8H0XWQXBS5NMAXKA
Description
Summary:Understanding the responding mechanism of reference evapotranspiration (ETo) to large-scale atmospheric circulation patterns is of particular concern in arid and semi-arid environments, where water resources scarcity constrains agriculture. This study investigates the statistical relationships between the Arctic Oscillation (AO) and the annual and seasonal mean ETo values of 41 weather stations in Iran for 1966-2005. The connections between the AO index and annual ETo are also examined during the extreme phases of the AO (high and low phases). Significant correlations between annual ETo and the corresponding AO index are quite rare, and the differences between the ETo values during the extreme AO phases and the long-term average ETo values were found to be significant only at three out of the 41 study stations. The lag correlations indicated that the greatest positive (0.506) and negative (-0.466) correlation coefficients were found for 2-season time lag. Furthermore, the mean time lag between the start of the AO events and the observed maximum effects on ETo at the study stations was about 1.61 seasons or 5 months. (C) 2014 Elsevier Ltd and INQUA. All rights reserved.

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