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Homogenization and trend detection of temperature in Iran for the period 1960–2018

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Abstract

The daily minimum, maximum and mean temperature data at 37 weather stations in Iran from 1960 to 2018 were analyzed for their homogeneity and trend. Of these, only 10 stations passed the homogeneity test successfully without any break point or outlier. Approximately 75% of the breaks could be explained by the station relocation. Annual and seasonal anomalies of the homogenized series were calculated using the 30-year period of 1961–1990 as the reference. The regional trend of temperature was estimated using the mean annual and seasonal anomalies from stations that showed similar variability. The mean temperatures showed a positive trend over most of the 10 regions in Iran, with the rate of change varying from 0.1 to \(0.4^{\circ }\) C/decade. The minimum temperatures increased significantly in all the regions at the rate of 0.35– \(0.63^{\circ }\) C/decade, with the highest warming occurring over the central area of Iran in autumn. The maximum temperatures showed a positive trend over all the 10 regions with the exception of the east area. The associated rate of change varied from 0.14 to \(0.29^{\circ }\) C/decade. The highest increase occurred over the Northeastern area during spring.

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Authors and Affiliations

  1. Applied Climatology Group, Climatological Research Institute (CRI), Atmospheric Science and Meteorological Research Center (ASMERC), Mashhad, Iran

    Zohreh Javanshiri

  2. Disasters and Climate Change Group, Climatological Research Institute (CRI), Atmospheric Science and Meteorological Research Center (ASMERC), Mashhad, Iran

    Morteza Pakdaman

  3. Climate Modeling and Prediction Group, Climatological Research Institute (CRI), Atmospheric Science and Meteorological Research Center (ASMERC), Mashhad, Iran

    Yashar Falamarzi

Authors
  1. Zohreh Javanshiri
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  2. Morteza Pakdaman
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  3. Yashar Falamarzi
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Correspondence to Zohreh Javanshiri.

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Responsible Editor Emilia Kyung Jin.

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Javanshiri, Z., Pakdaman, M. & Falamarzi, Y. Homogenization and trend detection of temperature in Iran for the period 1960–2018. Meteorol Atmos Phys 133, 1233–1250 (2021). https://doi.org/10.1007/s00703-021-00805-1

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