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Spatial contribution of one-day precipitations variability to rainy days and rainfall amounts in Iran

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Abstract

Rainfalls with short persistency are the tangible characteristics of arid and semiarid regions such as Iran. Iran is an arid and semiarid region with dramatic tempo-spatial changes of rainfall. In this regard, the short persistency of rainfall is approximately observed from 1 to 7 days in whole parts, while the greater ones are only separated in eastern parts of Iran. According to the results, the rainfall persistency is ranged from 1 to 45 days, but the maximum amount and rainy days are generated by rainfalls with short persistency. So, the rainfall events with long persistency are considered as an extreme event with extreme variability. One-day precipitations generate the maximum rainy days and rainfall amounts, especially in eastern parts of Iran. Decrease in the one-day precipitations contribution to eastern parts may indicate to decrease in regional precipitation. However, decrease in contribution in western parts may indicate to increased amounts of rainfall at other persistency rates. Our results revealed that the contribution of the one-day precipitation to general rainfall has reductive trends in almost 17.5 % of the whole Iran. The most integrated and significant reductive trend of one-day precipitation contribution to rainfall spreads northeastern and eastern parts of Iran. However, in the western parts of Iran, decreasing one-day precipitation contribution to rainy days affects to increase in the diurnal rainfall. The mentioned variability can be considered as the climate change signals in respect of one-day precipitation.

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Acknowledgments

We are very grateful to Dr. Abolfazl Masoodian from Department of Geography at University of Isfahan in Iran and Dr. Mahmood Khosravi from Department of Geography at University of Sistan and Baluchestan in Iran for their superior advises. Thanks also to one anonymous reviewer for suggestions on data interpretations.

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Authors and Affiliations

  1. Department of Environment, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran

    H. Nazaripour

  2. Department of Geography, Mashhad Branch, Islamic Azad University, Mashhad, Iran

    M. R. Mansouri Daneshvar

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  1. H. Nazaripour
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  2. M. R. Mansouri Daneshvar
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Correspondence to M. R. Mansouri Daneshvar.

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Nazaripour, H., Mansouri Daneshvar, M.R. Spatial contribution of one-day precipitations variability to rainy days and rainfall amounts in Iran. Int. J. Environ. Sci. Technol. 11, 1751–1758 (2014). https://doi.org/10.1007/s13762-014-0616-x

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  • DOI: https://doi.org/10.1007/s13762-014-0616-x

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