Abstract
The extreme temperature indices (ETI) are an essential indicator of climate change. The detection of their changes over the next years can play an essential role in the climate action plan (CAP). In this study, four temperature indices (mean of daily minimum temperature (TN), mean of daily maximum temperature (TX), cold-spell duration index (CSDI), and warm-spell duration index (WSDI)) were defined by ETCCDI and two new indices,the maximum number of consecutive frost days (CFD) and the maximum number of consecutive summer days (CSU), were used to examine ETIs in Iran under climate change conditions. We used minimum and maximum daily temperatures of five general circulation models (GCMs), including HadGEM2-ES, IPSL-CM5A-LR, GFDL-ESM2M, MIROC-ESM-CHEM, and NorESM1-M, from the set of CMIP5 bias-correction models. We investigated two representative concentration pathway (RCP) scenarios of RCP4.5 and RCP8.5 during the historical (1965–2005) and future (2021–2060 and 2061–2100) periods. The performance of each model evaluated using the Taylor diagram on a seasonal scale. Among models, GFDL-ESM2M and HadGEM2-ES showed the highest, and NorESM1-M and IPSL-CM5A-LR showed the lowest performance in Iran. Then, an ensemble model was generated using independence weighted mean (IWM) method. The results of multi-model ensembles (MME) showed a higher performance compared to individual CMIP5 models in all seasons. Also, the uncertainty value significantly reduced, and the correlation value of the MME model reached 0.95 in all seasons. Additionally, it is found that WSDI and CSU indices showed positive anomalies in future periods, and CSDI and CFD showed negative anomalies throughout Iran. Also, at the end of the twenty-first century, no cold spells are projected in almost every part of Iran. The CSU index showed that summer days are increasing sharply; according to the results of the RCP8.5 scenario in spring (MAM) and autumn (SON), the CSU will increase by 18.79 and 20.51 days, respectively, at the end of the twenty-first century. It projected that in the future, the spring and autumn seasons will be shorter and summers will be much longer than before.
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Data availability
Daily minimum and maximum temperatures are provided by the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) (https://esg.pik-potsdam.de/search/isimip/).
Code availability
The R package used in this paper is available on GitHub (https://github.com/ECCC-CDAS/RClimDex)
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Acknowledgements
We would like to thank the Iran Meteorological Organization (IRIMO) for providing the necessary data and information. We also acknowledge the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) and associated World Climate Research Program (WCRP) for the production of the data.
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This research was funded by the Vice Chancellor for Research of Ferdowsi University of Mashhad, which is hereby acknowledged.
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Conceived and designed the analysis: Azar Zarrin and Abbasali Dadashi-Roudbari.
Collected the data: Azar Zarrin, Abbasali Dadashi-Roudbari, and Samira Hassani.
Contributed data or analysis tools: Azar Zarrin, Abbasali Dadashi-Roudbari, and Samira Hassani.
Performed the analysis: Azar Zarrin and Abbasali Dadashi-Roudbari.
Wrote the paper: Azar Zarrin and Abbasali Dadashi-Roudbari.
Writing—review and editing: Azar Zarrin.
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Zarrin, A., Dadashi-Roudbari, A. & Hassani, S. Historical variability and future changes in seasonal extreme temperature over Iran. Theor Appl Climatol 146, 1227–1248 (2021). https://doi.org/10.1007/s00704-021-03795-7
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DOI: https://doi.org/10.1007/s00704-021-03795-7