Water Mass Transformation and Overturning Circulation in the Arabian Gulf

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 t...

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Veröffentlicht in:Journal of physical oceanography 2021-11, Vol.51 (11), p.3513-3527
Hauptverfasser: Al-Shehhi, Maryam R., Song, Hajoon, Scott, Jeffery, Marshall, John
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container_title Journal of physical oceanography
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creator Al-Shehhi, Maryam R.
Song, Hajoon
Scott, Jeffery
Marshall, John
description 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.
doi_str_mv 10.1175/JPO-D-20-0249.1
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source American Meteorological Society; EZB-FREE-00999 freely available EZB journals
subjects Air
Air-sea flux
Evaporation
Heat flux
Heat transfer
Latent heat
Mass
Seasonal variation
Straits
Three dimensional flow
Transformations
Water circulation
Water mass transformation
Water masses
title Water Mass Transformation and Overturning Circulation in the Arabian Gulf
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