Journal of Wetland Ecobiology
Volume 15, Issue 4 (Winter 2024)
2024, 15(4): 59-80 |
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Assessment of Chlorophyll and the Influence of Atmospheric Variables on Its Variability in the Persian Gulf and the Gulf of Oman during 2010–2020. Wetland Ecobiology 2024; 15 (4) : 5
URL: http://jweb.ahvaz.iau.ir/article-1-1111-en.html
URL: http://jweb.ahvaz.iau.ir/article-1-1111-en.html
Abstract: (228 Views)
Chlorophyll-a concentrations in marine waters, as an indicator of biological status, play a crucial role in monitoring ecosystem health and evaluating primary productivity. Variations in chlorophyll-a can reflect changes in environmental conditions and water quality. Understanding the relationship between biological characteristics—particularly chlorophyll-a—and atmospheric quantities such as dust is therefore of great importance. The present study aims to examine the temporal variations of chlorophyll-a concentration and its interactions with atmospheric parameters in the Persian Gulf and the Gulf of Oman. For this purpose, monthly mean data of chlorophyll-a, surface dust, 2-meter air temperature, 10-meter wind speed, and precipitation were obtained from the MERRA-2 reanalysis with a spatial resolution of 0.625° × 0.5° for the period 2010–2020. Monthly and annual time series of each variable were analyzed separately for both regions. To determine the atmospheric influence on chlorophyll-a, Spearman and Pearson correlation coefficients along with multiple regression analysis were employed.
The results showed that chlorophyll-a concentrations in the Gulf of Oman are higher and more spatially variable than in the Persian Gulf. The highest values occurred during the cold season, while the lowest values were observed in the warm season. Monthly distribution patterns of chlorophyll-a and the atmospheric variables—except air temperature—differ between the two marine environments. According to Spearman correlation results, in the Persian Gulf, increasing dust (−0.64), increasing temperature (−0.48), and decreasing precipitation (+0.29) are associated with lower chlorophyll-a concentration. In the Gulf of Oman, increasing temperature (−0.75), wind speed (−0.43), and dust (−0.28) contribute to chlorophyll-a reduction. Multiple regression analysis revealed that dust and temperature are the most influential drivers of chlorophyll-a variability in the Persian Gulf, while in the Gulf of Oman, temperature and dust play the dominant roles. The impacts of precipitation and wind on chlorophyll-a in the study area were not precisely determined, likely due to their indirect effects or their interaction with other environmental factors such as temperature.
The results showed that chlorophyll-a concentrations in the Gulf of Oman are higher and more spatially variable than in the Persian Gulf. The highest values occurred during the cold season, while the lowest values were observed in the warm season. Monthly distribution patterns of chlorophyll-a and the atmospheric variables—except air temperature—differ between the two marine environments. According to Spearman correlation results, in the Persian Gulf, increasing dust (−0.64), increasing temperature (−0.48), and decreasing precipitation (+0.29) are associated with lower chlorophyll-a concentration. In the Gulf of Oman, increasing temperature (−0.75), wind speed (−0.43), and dust (−0.28) contribute to chlorophyll-a reduction. Multiple regression analysis revealed that dust and temperature are the most influential drivers of chlorophyll-a variability in the Persian Gulf, while in the Gulf of Oman, temperature and dust play the dominant roles. The impacts of precipitation and wind on chlorophyll-a in the study area were not precisely determined, likely due to their indirect effects or their interaction with other environmental factors such as temperature.
Article number: 5
Type of Study: Research |
Subject:
Special
Received: 2025/12/7 | Accepted: 2026/01/4 | Published: 2026/01/4
Received: 2025/12/7 | Accepted: 2026/01/4 | Published: 2026/01/4
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