We diagnose the ocean’s residual overturning circulation of the Arabian Gulf in a high-resolution model and interpret it in terms of water-mass transformation processes mediated by air–sea buoyancy fluxes and interior mixing. We attempt to rationalize the complex three-dimensional flow in terms of the superposition of a zonal (roughly along axis) and meridional (transverse) overturning pattern. Rates of overturning and the seasonal cycle of air–sea fluxes sustaining them are quantified and ranked in order of importance. Air–sea fluxes dominate the budget so that, at zero order, the magnitude and sense of the overturning circulation can be inferred from air–sea fluxes, with interior mixing playing a lesser role. We find that wintertime latent heat fluxes dominate the water-mass transformation rate in the interior waters of the Gulf leading to a diapycnal volume flux directed toward higher densities. In the zonal overturning cell, fluid is drawn in from the Sea of Oman through the Strait of Hormuz, transformed, and exits the Strait near the southern and bottom boundaries. Along the southern margin of the Gulf, evaporation plays an important role in the meridional overturning pattern inducing sinking there.
|Number of pages||15|
|Journal||Journal of Physical Oceanography|
|Publication status||Published - 2021 Nov|
Bibliographical noteFunding Information:
Acknowledgments. H.S. acknowledges the support by National Research Foundation of Korea (NRF) Grant (NRF-2019R1C1C1003663 and NRF-2020R1A4A1016537). M.A., J.M., and J.S. acknowledges Khalifa University for its generous financial support and Prof. Hosni Ghedira for the access to his laboratory facilities.
© 2021 American Meteorological Society.
All Science Journal Classification (ASJC) codes