Parametric and nonparametric correlation analysis of Indian Ocean Dipole (IOD) Index and drought and wet years in Iran

Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

The research mostly aims to investigate the correlation analysis of the Indian Ocean Dipole (IOD) index   and drought and wet years in Iran on a monthly basis. To this aim, a correlation analysis was performed between the Standardized Precipitation Index (SPI) of 63 synoptic stations in Iran and the Indian Ocean Dipole (IOD) index values using the Pearson product-moment correlation coefficient and Spearman's rank correlation coefficient. The findings suggested that in autumn, a moderate positive correlation was noted between the Indian Ocean Dipole (IOD) Index and    drought and wet years in Iran in a one-month lag. In other words, droughts of the autumn season in Iran occurred in the negative phase while wet years in the positive phase of this index. In the winter, however, no significant correlation was noted between the drought and wet years in Iran and the Indian Ocean Dipole (IOD) index. It was also noted in springs that there was a negative correlation between drought and wet years in Iran, especially in its southern parts and the Indian Ocean Dipole (IOD) index. In other words, the droughts in this season in Iran occurred in the positive phase while the wet years in the negative phase, i.e., exactly the opposite of the relationship seen in the autumn.

Language:
Persian
Published:
Geographic Space, Volume:24 Issue: 88, 2025
Pages:
193 to 219
https://www.magiran.com/p2839687  
سامانه نویسندگان
  • Mahmoudi، Peyman
    Corresponding Author (2)
    Mahmoudi, Peyman
    Assistant Professor Physical geography, University of Sistan and Baluchestan, زاهدان, Iran
  • Khosravi، Mahmood
    Author (3)
    Khosravi, Mahmood
    Professor Climatology,Department of Physical Geography,Faculty of Geography and Environmental Planing, University of Sistan and Baluchestan, زاهدان, Iran
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