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Synoptic-dynamic analysis of extreme precipitation in Karoun River Basin, Iran

  • Iman RoustaEmail author
  • Mostafa Karampour
  • Mehdi Doostkamian
  • Haraldur Olafsson
  • Hao Zhang
  • Terence Darlington Mushore
  • Amin Shiri Karimvandi
  • Edgar Ricardo Monroy Vargas
Original Paper

Abstract

In the present study, synoptic-dynamic aspects of extreme precipitation in Karoun River Basin were analyzed using two types of data, namely (1) grid views of Iran’s daily precipitation as registered in 1434 stations and (2) atmospheric data including sea-level pressure (SLP), geopotential height (HGT) for 1000, 850, and 500 hPa, temperature, and U&V wind components for a 54-year statistical period (1960–2013). In order to identify extreme precipitation, three criteria were used: the precipitation events should exceed 95th percentile threshold, have a minimum of 50% coverage with spatial continuity, and last for at least two consecutive days. The results showed that extreme precipitation of study area are affected by atmospheric patterns of the Caspian Sea low pressure-European migratory high pressure, Eastern Mediterranean low pressure-Central Iran low pressure, the Eastern Mediterranean low pressure-Siberian-Tibetan high pressure, and Sudanic low pressure-gigantic European high pressure. In all these patterns, the cyclonic motion is observed at all of the atmosphere levels, which indicates the effect of the atmosphere dynamic mechanisms at the time of occurrence of extreme precipitation. At 300 hPa level, the left side of the jet stream, the left exit of the subtropical jet stream, and the right entrance of the polar front jet stream were located over the study area.

Keywords

Extreme precipitation Moisture flux convergence Atmosphere vorticity Jet stream Karoun River basin 

Notes

Acknowledgments

Iman Rousta is deeply grateful to his supervisor (Haraldur Olafsson, Professor of Atmospheric Sciences, Department of Physics, University of Iceland, Institute for Atmospheric Sciences and Icelandic Meteorological Office) for his great support, kind guidance, and encouragement. The authors would like to thank Prof. Seyyed Abolfazl Masoudian for providing the Asfazari dataset. We are also grateful to the Iran Meteorological Organization and NCEP/NCAR for providing the meteorological data for this study.

Author contributions

I.R. and M.D. proposed the topic. The corresponding author, I.R., M.K., M.D., H.O., H.Z., A.S.K, and E.R.M.V. commanded the data processing, analysis, and wrote the manuscript. I.R., M.K., M.D., H.O., H.Z., T.D.M., and E.R.M.V., helped to enhance the research design, analysis, and manuscript writing.

Funding statement

This work was supported by Vedurfelagid, Rannis, and Rannsoknastofa i vedurfraedi.

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

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Copyright information

© Saudi Society for Geosciences 2020

Authors and Affiliations

  • Iman Rousta
    • 1
    • 2
    Email author
  • Mostafa Karampour
    • 3
  • Mehdi Doostkamian
    • 4
  • Haraldur Olafsson
    • 5
  • Hao Zhang
    • 6
  • Terence Darlington Mushore
    • 7
  • Amin Shiri Karimvandi
    • 4
  • Edgar Ricardo Monroy Vargas
    • 8
  1. 1.Department of GeographyYazd UniversityYazdIran
  2. 2.Institute for Atmospheric Sciences- Weather and ClimateUniversity of Iceland and Icelandic Meteorological Office (IMO)ReykjavikIceland
  3. 3.Department of GeographyLorestan UniversityLorestanIran
  4. 4.Department of GeographyUniversity of ZanjanZanjanIran
  5. 5.Department of PhysicsUniversity of Iceland, Institute for Atmospheric Sciences- Weather and Climate, and Icelandic Meteorological Office (IMO)ReykjavikIceland
  6. 6.Department of Environmental Science and EngineeringFudan UniversityShanghaiChina
  7. 7.Department of Physics, Faculty of ScienceUniversity of ZimbabweHarareZimbabwe
  8. 8.Department of Civil EngineeringUniversidad Catolica de ColombiaBogotáColombia

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