Spatiotemporal Variability of Chlorophyll-a and Sea Surface Temperature, and Their Relationship with Bathymetry over the Coasts of UAE

Date
2021-06-23
Authors
Hussein, Khalid A.
Al Abdouli, Khameis
Ghebreyesus, Dawit T.
Petchprayoon, Pakorn
Al Hosani, Naeema
Sharif, Hatim O.
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Abstract

The catastrophic implication of harmful algal bloom (HAB) events in the Arabian Gulf is a strong indication that the study of the spatiotemporal distribution of chlorophyll-a and its relationship with other variables is critical. This study analyzes the relationship between chlorophyll-a (Chl-a) and sea surface temperature (SST) and their trends in the Arabian Gulf and the Gulf of Oman along the United Arab Emirates coast. Additionally, the relationship between bathymetry and Chl-a and SST was examined. The MODIS Aqua product with a resolution of 1 × 1 km2 was employed for both chlorophyll-a and SST covering a timeframe from 2003 to 2019. The highest concentration of chlorophyll-a was seen in the Strait of Hormuz with an average of 2.8 mg m(-3), which is 1.1 mg m(-3) higher than the average for the entire study area. Three-quarters of the study area showed a significant correlation between the Chl-a and SST. The shallow (deep) areas showed a strong positive (negative) correlation between the Chl-a and SST. The results indicate the presence of trends for both variables across most of the study area. SST significantly increased in more than two-thirds of the study area in the summer with no significant trends detected in the winter.

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Keywords
Arabian Gulf, Gulf of Oman, MODIS, algal blooms, chlorophyll-a, SST, bathymetry
Citation
Remote Sensing 13 (13): 2447 (2021)
Department
Civil and Environmental Engineering