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A study of frost occurrence and minimum temperatures in Iran

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Abstract

In this research, the frequency of frost is analysed from 95 synoptic stations for the period 1990–2015. This information was categorised by a fuzzy c-approach clustering algorithm and indicated that Iran is classified into five clusters with the aid of the frost-occurrence frequencies. The greatest frequency of days with frost prevalence is located in Cluster 1 that consists of Sarab station with an average annual frequency of 141.1 days over the period 1990–2015. The least frequent is found in Cluster 5 that consists of the stations positioned along the south and north coasts. Spatial association for the frequency of incidence of frost days also includes a dependence on elevation and latitude of stations, as well as their situation inside the course of external synoptic systems, bodily and geomorphological features and local climate. Also, a study of daily minimum temperature displays a widespread warming trend at some stage during this period, and has discovered an increase in the index of the number of tropical nights, warmest nights and coldest nights and decreasing trends have been determined in the number of frost days, cool nights and cold spell period index over most regions of Iran.

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Acknowledgements

The authors would like to thank the I.R. of Iran Meteorological Organisation (IRIMO) for providing the meteorological data for this study. We also would like to thank Stephen Berg for assistance with the writing. We also acknowledge financial support from Mohaghegh Ardabili University.

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Authors and Affiliations

  1. Faculty of Literature & Humanities, Department of Physical Geography, University of Mohaghegh Ardabili, Ardabil, 09141549147, Iran

    Batool Zeinali, Maryam Teymouri, Sayyad Asghari & Masiholah Mohammadi

  2. Department of Hydrology, Indian Institute of Technology Roorkee, Roorkee, India

    Vivek Gupta

Authors
  1. Batool Zeinali
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  2. Maryam Teymouri
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  3. Sayyad Asghari
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  4. Masiholah Mohammadi
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  5. Vivek Gupta
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Correspondence to Batool Zeinali.

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Corresponding Editor: N V Chalapathi Rao

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Zeinali, B., Teymouri, M., Asghari, S. et al. A study of frost occurrence and minimum temperatures in Iran. J Earth Syst Sci 128, 134 (2019). https://doi.org/10.1007/s12040-019-1152-3

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  • DOI: https://doi.org/10.1007/s12040-019-1152-3

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