Impact of Tidal Mixing on Water Mass Transformation and Circulation in the South China Sea

Using a high-resolution regional ocean model, the impact of tidal mixing on water mass transformation and circulation in the South China Sea (SCS) is investigated through a set of numerical experiments with different configurations of tide-induced diapycnal diffusivity. The results show that includi...

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Veröffentlicht in:Journal of physical oceanography 2017-02, Vol.47 (2), p.419-432
Hauptverfasser: Wang, Xiaowei, Liu, Zhiyu, Peng, Shiqiu
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Peng, Shiqiu
description Using a high-resolution regional ocean model, the impact of tidal mixing on water mass transformation and circulation in the South China Sea (SCS) is investigated through a set of numerical experiments with different configurations of tide-induced diapycnal diffusivity. The results show that including tidal mixing in both the Luzon Strait (LS) and SCS has significant impact on the LS transport and the intermediate–deep layer circulation in the SCS Basin. Analysis of the density field indicates that tidal mixing in both the LS and SCS are essential for sustaining a consistent density gradient and thus a persistent outward-directed baroclinic pressure gradient both between the western Pacific and LS and between the LS and SCS Basin, so as to maintain the strong deep-water transport through the LS. Further analysis of water mass properties suggests that tidal mixing in the deep SCS would strengthen the horizontal density gradient, intensify the basin-scale cyclonic circulation, induce more vigorous overturning, as well as generate the subbasin-scale eddies in the abyssal SCS. The results imply that tidal mixing in both the LS and SCS plays a key dynamic role in controlling water mass properties and deep circulation features in the SCS and thus need to be deliberately parameterized in ocean circulation models for this region.
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subjects Abyssal zone
Circulation
Cyclonic circulation
Deep layer
Deep water
Deep water circulation
Density
Density field
Density gradients
Eddies
General circulation models
High resolution
Laboratories
Mass
Numerical experiments
Ocean circulation
Ocean circulation models
Ocean currents
Ocean models
Oceanography
Pressure gradients
Properties
Science
Studies
Tidal mixing
Topography
Transport
Vortices
Water
Water analysis
Water circulation
Water mass properties
Water mass transformation
Water transport
Wind
title Impact of Tidal Mixing on Water Mass Transformation and Circulation in the South China Sea
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