Journal of Agricultural Meteorology

Journal of Agricultural Meteorology

Analysis of the effect of Indian Ocean Dipolar Oscillation (IOD) on vegetation cover variability (Case study: Sistan and Baluchistan Province)

Articles in Press

Document Type : Original Article

Authors
Kamal omidvar 1
Rashed Dehani 2
1 Department of Geography, Faculty of Humanities, Yazd University, Yazd, Iran
2 Department of Geography, Yazd University
10.22125/agmj.2025.442455.1165
Abstract
Weather patterns affect vegetation growth and development dynamics. The aim of this research is to analyze the relationship between the vegetation cover of Sistan and Baluchistan province and the Indian Ocean Dipolar Oscillation (IOD) in different seasons. For this purpose, the NDVI data of MODIS sensor have been used during the period 2001 to 2022. The areas with vegetation cover were selected based on average NDVI values higher than 0.12. Then, according to the NDVI values the sensivity of coverage area with IOD were investigated and three classes including thin,medium and thick were determined . The results indicate that there is not a specific pattern in correlation coefficient values. The highest positive correlation coefficient of vegetation cover and in all three thin, medium and dense classes was observed in the spring season with (r 0.450; p < 0.05) and the lowest correlation is observed in the winter season. Since the positive (rainfall increase) and negative (rainfall decrease) phases of the IOD index have a direct effect on the summer rainfall in the south of the province, it is possible to predict the of vegetation cover status with one or two months delay in the southern region of the province using the IOD values
Keywords
Indian Ocean Bipolar Oscillation
Vegetation
modis Sensor
Sistan and Baluchistan
Subjects
Journal of Agricultural Meteorology

Articles in Press, Accepted Manuscript
Available Online from 05 April 2025