Intraseasonal Sea Level Variability in the Persian Gulf

Abstract Satellite observations are used to establish the dominant magnitudes, scales, and mechanisms of intraseasonal variability in ocean dynamic sea level ( ? ) Persian Gulf over 2002–15. Empirical orthogonal function (EOF) analysis applied altimetry data reveals a basinwide, single-signed fluctuation that contributes importantly variance at monthly decadal time scales. An EOF Gravity Recovery Climate Experiment (GRACE) same period returns similar large-scale mode variability, suggesting basinwide variation has predominantly barotropic nature. A linear theory is developed interpret data. The represents average terms local freshwater flux, barometric pressure, wind stress forcing, as well boundary Oman. tested using multiple regression with these stress, quantities input output. explains 70% ± 9% (95% confidence interval) variance. Numerical values coefficients computed empirically from consistent theoretical expectations first principles. Results point substantial nonisostatic response surface loading. Oman condition shows lagged correlation upstream along Indian subcontinent, Maritime Continent, equatorial Ocean, Ocean influence on mediated by coastal waves hinting potential predictability. This study highlights value GRACE for understanding an understudied marginal sea.