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Investigation of spatial and temporal variability of precipitation in Iran over the last half century

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Abstract

Investigation of the precipitation phenomenon as one of the most important meteorological factors directly affecting access to water resources is of paramount importance. In this study, the precipitation concentration index (PCI) was calculated using annual precipitation data from 34 synoptic stations of Iran over a 50-year period (1961–2010). The trend of precipitation and the PCI index were analyzed using the Mann–Kendall test after removing the effect of autocorrelation coefficients in annual and seasonal time scales. The results of zoning the studied index at annual time scale revealed that precipitation concentration follows a similar trend within two 25-year subscales. Furthermore, the PCI index in central and southern regions of the country, including the stations of Kerman, Bandarabbas, Yazd, Zahedan, Shahrekord, Birjand, Bushehr, Ahwaz, and Esfahan indicates a strong irregularity and high concentration in atmospheric precipitations. In annual time scale, none of the studied stations, had shown regular concentration (PCI < 10). Analyzing the trend of PCI index during the period of 1961–2010 witnessed an insignificant increasing (decreasing) trend in 16 (15) stations for winter season, respectively, while it faced a significant negative trend in Dezful, Saghez, and Hamedan stations. Similarly, in spring, Kerman and Ramsar stations exhibited a significant increasing trend in the PCI index, implying significant development of precipitation concentration irregularities in these two stations. In summer, Gorgan station showed a strong and significant irregularity for the PCI index and in autumn, Tabriz and Zahedan (Babolsar) stations experienced a significant increasing (decreasing) trend in the PCI index. At the annual time scale, 50 % of stations experienced an increasing trend in the PCI index. Investigating the changes in the precipitation trend also revealed that in annual time scale, about 58 % of the stations had a decreasing trend. In winter, which is the rainiest season in Iran, about 64 % of stations experienced a decreasing trend in precipitation that caused an increasing trend in PCI index. Comparing the spatial distribution of PCI index within two 25 years sub-periods indicated that the PCI index of the second sub-period increased in the spring time scale that means irregularity of precipitation distribution has been increased. But in the other seasons any significant variations were not observed. Also in the annual time scale the PCI index increased in the second sub-period because of the increasing trend of precipitation.

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Authors and Affiliations

  1. Department of Water Engineering, Faculty of Agriculture, Urmia University, Urmia, Iran

    Keivan Khalili

  2. Young Researchers and Elite Club, Urmia, Iran

    Mohammad Nazeri Tahoudi

  3. Department of Water Engineering, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran

    Rasoul Mirabbasi

  4. Department of Hydrology and Water Resources Engineering, Faculty of Water Sciences Engineering, Shahid Chamran University, Ahwaz, Iran

    Farshad Ahmadi

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  1. Keivan Khalili
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  2. Mohammad Nazeri Tahoudi
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  3. Rasoul Mirabbasi
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  4. Farshad Ahmadi
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Correspondence to Rasoul Mirabbasi.

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Khalili, K., Tahoudi, M.N., Mirabbasi, R. et al. Investigation of spatial and temporal variability of precipitation in Iran over the last half century. Stoch Environ Res Risk Assess 30, 1205–1221 (2016). https://doi.org/10.1007/s00477-015-1095-4

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