East-west Variability of Sea Level in the Red Sea

In comparison to other regions of the world, the physical mechanisms related with sea level fluctuations are not widely researched. In the current study, the sea level variability in the Red Sea is examined using data from more than 2.5 decades of satellite altimetry-based remote sensing measurements. The investigation found a consistent east-west pattern that is evident every year when the east-west sea level difference is taken into account. This east-west (EW) difference is positive in the winter when the Red Sea’s eastern shore has higher sea levels and negative in the summer when the same region experiences significantly lower sea levels. There is a fluctuating trend in the shift in sea levels between May and October, which are transitional months. During the summer, the EW difference in the southern Red Sea is, on average, 0.2 cm larger than that in the northern part. Wavelet analysis reveals a strong annual cycle as well as other signals of lesser amplitude for both the northern and southern Red Seas. Empirical Orthogonal Function (EOF) study shows that EOF1 correlates to 98 percent of overall variability, EOF2 to 1.3 percent, and EOF3 to 0.4 percent. In contrast to the Indian Ocean Dipole (IOD) and North Atlantic Oscillation (NAO), ENSO exhibits a significant remote response to EW variations. Three physical factors—wind, buoyancy, and the polarity of eddies—are responsible for the occurrence of this EW differential phenomenon.

Author (s) Details

Cheriyeri Poyil Abdulla

Department of Marine Physics, King Abdulaziz University, Jeddah-80200, Saudi Arabia and  Department of Physical Oceanography, Cochin University of Science and Technology, Kochi-682016, India.


View Book :-  https://stm.bookpi.org/ECEES-V4/article/view/7581

Keywords –  Satellite altimetry, sea level anomaly, el-nino southern oscillation, Indian Ocean Dipole, north atlantic oscillation, red Sea

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