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Article Type

Research Article

Subject Area

Oceanography

Abstract

The variability in seawater salinity, an indicator of the global hydrological cycle, is crucial in basin-scale circulation and so many dynamical processes from basin to global scale. Salinity is significant for marine science because fluctuations in salinity can affect physical processes such as climate change, ocean current variations, and water mass formation. From a biological perspective, variations in salinity may pose a threat to marine animals and disrupt their normal functioning. In this study, the long-term variability of salinity in the photic zone (0-200 m) of the Egyptian Mediterranean Sea is examined using an extended data set from 1950 to 2021. On monthly basis, the western sector of the Egyptian Mediterranean coast usually has lower salinity than its eastern sector. Seasonally, the maximum surface sNational Institute of Oceanography and Fisheries, NIOF, Egyptalinity was observed in autumn, while spring was the season with the lowest surface salinity variations. Positive trends in the salinity anomaly variations were found in the upper water layer (0-50 m) then trends changed to be of negative patterns along the depths of 100, 150 and 200 m. Therefore, the depth of 50 m is said to divide the surface and subsurface waters with opposite trends. Future research should be undertaken based on our qualitative analysis to foresee and model the progression of salinity in the region.


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