Spatiotemporal variations of evapotranspiration and reference crop water requirement over 1957–2016 in Iran based on CRU TS gridded dataset

Article

Collins, Brian, Ramezani-Etedali, Hadi, Tavakol, Ameneh and Kaviani, Abbas. 2021. "Spatiotemporal variations of evapotranspiration and reference crop water requirement over 1957–2016 in Iran based on CRU TS gridded dataset." Journal of Arid Land. 13 (8), p. 858–878. https://doi.org/10.1007/s40333-021-0103-4
Article Title

Spatiotemporal variations of evapotranspiration and reference crop water requirement over 1957–2016 in Iran based on CRU TS gridded dataset

ERA Journal ID210794
Article CategoryArticle
AuthorsCollins, Brian, Ramezani-Etedali, Hadi, Tavakol, Ameneh and Kaviani, Abbas
Journal TitleJournal of Arid Land
Journal Citation13 (8), p. 858–878
Number of Pages22
Year2021
PublisherSpringer
Place of PublicationChina
ISSN1674-6767
2194-7783
Digital Object Identifier (DOI)https://doi.org/10.1007/s40333-021-0103-4
Web Address (URL)https://link.springer.com/article/10.1007/s40333-021-0103-4
Abstract

Agriculture needs to produce more food to feed the growing population in the 21st century. It makes the reference crop water requirement (WREQ) a major challenge especially in regions with limited water and high water demand. Iran, with large climatic variability, is experiencing a serious water crisis due to limited water resources and inefficient agriculture. In order to overcome the issue of uneven distribution of weather stations, gridded Climatic Research Unit (CRU) data was applied to analyze the changes in potential evapotranspiration (PET), effective precipitation (EFFPRE) and WREQ. Validation of data using in situ observation showed an acceptable performance of CRU in Iran. Changes in PET, EFFPRE and WREQ were analyzed in two 30-a periods 1957–1986 and 1987–2016. Comparing two periods showed an increase in PET and WREQ in regions extended from the southwest to northeast and a decrease in the southeast, more significant in summer and spring. However, EFFPRE decreased in the southeast, northeast, and northwest, especially in winter and spring. Analysis of annual trends revealed an upward trend in PET (14.32 mm/decade) and WREQ (25.50 mm/decade), but a downward trend in EFFPRE (−11.8 mm/decade) over the second period. Changes in PET, EFFPRE and WREQ in winter have the impact on the annual trend. Among climate variables, WREQ showed a significant correlation (r=0.59) with minimum temperature. The increase in WREQ and decrease in EFFPRE would exacerbate the agricultural water crisis in Iran. With all changes in PET and WREQ, immediate actions are needed to address the challenges in agriculture and adapt to the changing climate.

Keywordsevapotranspiration; reference crop water requirement; effective precipitation; trend; Iran; spatiotemporal change; CRU TS data
Article Publishing Charge (APC) FundingOther
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400513. Water resources engineering
Public Notes

The accessible file is the accepted version of the paper. Please refer to the URL for the published version.

Byline AffiliationsJames Cook University
Imam Khomeini International University, Iran
Kansas State University, United States
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