Spatiotemporal variations of evapotranspiration and reference crop water requirement over 1957–2016 in Iran based on CRU TS gridded dataset
Article
Article Title | Spatiotemporal variations of evapotranspiration and reference crop water requirement over 1957–2016 in Iran based on CRU TS gridded dataset |
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ERA Journal ID | 210794 |
Article Category | Article |
Authors | Collins, Brian, Ramezani-Etedali, Hadi, Tavakol, Ameneh and Kaviani, Abbas |
Journal Title | Journal of Arid Land |
Journal Citation | 13 (8), p. 858–878 |
Number of Pages | 22 |
Year | 2021 |
Publisher | Springer |
Place of Publication | China |
ISSN | 1674-6767 |
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. |
Keywords | evapotranspiration; reference crop water requirement; effective precipitation; trend; Iran; spatiotemporal change; CRU TS data |
Article Publishing Charge (APC) Funding | Other |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400513. 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 Affiliations | James Cook University |
Imam Khomeini International University, Iran | |
Kansas State University, United States |
https://research.usq.edu.au/item/z63w6/spatiotemporal-variations-of-evapotranspiration-and-reference-crop-water-requirement-over-1957-2016-in-iran-based-on-cru-ts-gridded-dataset
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