Volume 12, Issue 3 (12-2025)
Journal of Spatial Analysis Environmental Hazards 2025, 12(3): 0-0 |
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Salahi B, Frotan M. Analysis of the Relationship between Wet and Dry Seasons in Northern Provinces of Iran with some Teleconnection Indices. Journal of Spatial Analysis Environmental Hazards 2025; 12 (3)
URL: http://jsaeh.khu.ac.ir/article-1-3467-en.html
URL: http://jsaeh.khu.ac.ir/article-1-3467-en.html
1- University of Mohaghegh Ardabili , salahi@uma.ac.ir
2- University of Mohaghegh Ardabili
2- University of Mohaghegh Ardabili
Abstract: (1177 Views)
The ENSO weather phenomenon, including El Niño and La Niña phases, has significant effects on precipitation, temperature, and drought patterns in different regions of the world. This study aimed to investigate the relationship between ENSO indices such as MEI, SOI, and NINO oscillations with drought indices (TCI, VCI, VHI, and SPI) in the provinces of Guilan, Golestan, and Mazandaran from 2013 to 2022. Satellite data of NDVI, LST, and precipitation were extracted from Google Earth Engine to calculate drought indices, and ENSO data were obtained from the NOAA website for correlation analysis. The results showed that the MEI index had a positive and significant correlation with SPI and showed a decrease in drought with an increase in precipitation, but had a weak relationship with other drought indices. The SOI index showed a negative and significant correlation with SPI, indicating the effect of La Niña on increasing drought, especially in Golestan province. The El Niño indices were positively correlated with SPI in the northern provinces of Iran, confirming the effect of reducing drought and increasing precipitation. During the El Niño phase, the northern regions of the studied provinces experienced an increase in temperature and the south of Mazandaran province experienced subzero temperatures, while during the La Niña phase, the temperature increased and the northern regions of the studied provinces experienced higher temperatures. Vegetation was denser in the south of Golestan province and the east of Mazandaran province during the El Niño phase, but it decreased during the La Niña phase. The SPI index showed that drought during the El Niño phase was more widespread and severe in the western half of the studied provinces and more extensive and severe during the La Niña phase. The VHI index showed better vegetation health in El Niño, especially in Gilan and Mazandaran provinces, and decreased health in La Niña phase, especially in Mazandaran and Golestan provinces.
Type of Study: Applicable |
Subject:
Special
Received: 2024/11/20 | Accepted: 2026/01/4 | Published: 2026/01/7
Received: 2024/11/20 | Accepted: 2026/01/4 | Published: 2026/01/7
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