Abstract
This study analyzes the spatial and temporal distribution of trends on monthly, seasonal, and annual mean temperatures (1967–2017) at 22 stations in the Euphrates Basin of Turkey. The recently proposed innovative trend analysis (ITA) and the nonparametric Mann–Kendall (MK) and Spearman’s rho (SR) test at 5% and 1% significance levels were applied to examine the temporal trends of temperatures. Before using the nonparametric trend analysis, the serial correlation of the temperature data was removed with the pre-whitening (PW) method. Then, MK-Z values were mapped in ArcGIS environment using the Empirical Bayesian Kriging (EBK) method to reveal the spatial variation of temperature trends. As a result, according to the ITA method, increasing temperature trends at 1% significance level dominate almost all periods. Based on the MK and SR tests, it was identified that increase trends were dominant at 1% and 5% significance levels in February, March, April, July, August, Spring, Summer, and Annual periods. According to the spatial temperature trend maps, significant increase trends occupy an important place in most of the basin in February, March, April, June, July, August, Spring, Summer, Winter, and Annual periods. The study results provide important information to water resources managers and decision-makers about the regions at significant risk in climate change in the Euphrates Basin.
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Acknowledgements
The authors thank the General Directorate of Meteorology for the observed monthly temperature data provided, the Editor, and the anonymous reviewers for their contributions to the content and development of this paper.
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O.M. Katipoğlu solely made the study.
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Edited by Dr. Ankit Garg (ASSOCIATE EDITOR) / Dr. Michael Nones (CO-EDITOR-IN-CHIEF).
Appendix
Appendix
See Figs. 9, 10, 11, 12, Table 4.
Graphical evaluation of ITA method results of temporal temperature at Mardin station
Graphical evaluation of ITA method results of temporal temperature at Ağrı station
Graphical evaluation of ITA method results of temporal temperature at Elazığ station
Graphical evaluation of ITA method results of temporal temperature at Gaziantep station
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Katipoğlu, O.M. Analysis of spatial variation of temperature trends in the semiarid Euphrates basin using statistical approaches. Acta Geophys. 70, 1899–1921 (2022). https://doi.org/10.1007/s11600-022-00819-2
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DOI: https://doi.org/10.1007/s11600-022-00819-2