Climate Dynamics

, Volume 39, Issue 9–10, pp 2329–2341 | Cite as

The interannual precipitation variability in the southern part of Iran as linked to large-scale climate modes

  • Farnaz Pourasghar
  • Tomoki Tozuka
  • Saeed Jahanbakhsh
  • Behrooz Sari Sarraf
  • Hooshang Ghaemi
  • Toshio Yamagata
Article

Abstract

The interannual variation of precipitation in the southern part of Iran and its link with the large-scale climate modes are examined using monthly data from 183 meteorological stations during 1974–2005. The majority of precipitation occurs during the rainy season from October to May. The interannual variation in fall and early winter during the first part of the rainy season shows apparently a significant positive correlation with the Indian Ocean Dipole (IOD) and El Niño-Southern Oscillation (ENSO). However, a partial correlation analysis used to extract the respective influence of IOD and ENSO shows a significant positive correlation only with the IOD and not with ENSO. The southeasterly moisture flux anomaly over the Arabian Sea turns anti-cyclonically and transport more moisture to the southern part of Iran from the Arabian Sea, the Red Sea, and the Persian Gulf during the positive IOD. On the other hand, the moisture flux has northerly anomaly over Iran during the negative IOD, which results in reduced moisture supply from the south. During the latter part of the rainy season in late winter and spring, the interannual variation of precipitation is more strongly influenced by modes of variability over the Mediterranean Sea. The induced large-scale atmospheric circulation anomaly controls moisture supply from the Red Sea and the Persian Gulf.

Keywords

Interannual variation Precipitation IOD ENSO Iran 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Farnaz Pourasghar
    • 1
  • Tomoki Tozuka
    • 2
  • Saeed Jahanbakhsh
    • 1
  • Behrooz Sari Sarraf
    • 1
  • Hooshang Ghaemi
    • 3
  • Toshio Yamagata
    • 2
    • 4
  1. 1.Department of Physical Geography, Faculty of Humanities and Social ScienceThe University of TabrizTabrizIran
  2. 2.Department of Earth and Planetary Science, Graduate School of ScienceThe University of TokyoTokyoJapan
  3. 3.Iran Meteorological OrganizationTehranIran
  4. 4.Application Laboratory/JAMSTECYokohamaJapan

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