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The impact of climate change on Quaternary glaciers of Gharaghom Basin in Iran

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Abstract

This research has mapped the Quaternary equilibrium line altitude (ELA) using White’s and Porter’s methods to reconstruct past and present temperatures using a regression model in the Gharaghom basin located in northeastern Iran. The potential impact of climate change on glaciers was detected by using an artificial neural network. A regression model between temperature and altitude based on available observation data and reconstructed data indicated that the present temperature lapse rate of − 0.41 °C would occur for every hundred meters of increasing altitude in stations. The reconstruction of the past temperature of the Pleistocene revealed an increase of about 10.36–10.5 °C for the mean annual temperature of the current temperature in the basin. The recent ELA rises from the Pleistocene 2236 m and 2200 m a.s.l. according to White and Porter’s methods, respectively. So, considering the present temperature lapse rate and the highest altitude of 3271 m, the maximum Pleistocene ELA depression would be about 800 m due to modern temperature increase of 10.36–10.5 °C compared to the past Pleistocene temperature. Based on the neural network projection model, linear growth in temperature would occur for the next three decades (2021–2051) in the Gharaghom basin. The minimum temperature has been much more affected than the maximum temperature, so global warming has caused an increase in the monthly minimum and maximum temperature in most seasons in different parts of the basin based on trend analysis. The average temperature rise of 0.19 °C for future decades would consequently affect the water resources.

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All data generated or analyzed during this study are included in this published article (and its supplementary information files).

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Acknowledgements

This research was done as a master’s thesis project at Shahid Beheshti University. We thank the Iranian Meteorological Organization and National Cartographic Center in Iran for providing the data and Dr. AbbasAli Dadashi Roudbari for the useful comments to provide in Figure 18.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Tayebeh Akbari Azirani and Hossein Gorbani. The first draft of the manuscript was written by Tayebeh Akbari Azirani and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Tayebeh Akbari Azirani.

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Azirani, T.A., Ghorbani, H. The impact of climate change on Quaternary glaciers of Gharaghom Basin in Iran. Theor Appl Climatol 155, 1429–1450 (2024). https://doi.org/10.1007/s00704-023-04701-z

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