Effect of small-scale topography on eddy dissipation in the Northern South China Sea

Yang, Zhibin, Jing, Zhao and Zhai, Xiaoming (2022) Effect of small-scale topography on eddy dissipation in the Northern South China Sea. Journal of Physical Oceanography. ISSN 0022-3670 (In Press)

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Abstract

Mesoscale eddies are ubiquitous dynamical features, accounting for over 90% of 33 the total kinetic energy of the ocean. However, the pathway for eddy energy 34 dissipation has not been fully understood. Here we investigate the effect of 35 small-scale topography on eddy dissipation in the northern South China Sea by 36 comparing high-resolution ocean simulations with smooth and synthetically-generated 37 rough topography. The presence of rough topography is found to (1) significantly 38 enhance viscous dissipation and instabilities within a few hundred meters above the 39 rough bottom, especially in the slope region, and (2) change the relative importance of 40 energy dissipation by bottom frictional drag and interior viscosity. The role of lee 41 wave generation in eddy energy dissipation is investigated using a Lagrangian filter 42 method. About one-third of the enhanced viscous energy dissipation in the rough 43 topography experiment is associated with lee wave energy dissipation, with the 44 remaining two-thirds explained by nonwave energy dissipation, at least partly as a 45 result of the nonpropagating form drag effect.

Item Type: Article
Additional Information: Data availability statement: All the model configuration files and codes used for analyses are available from the corresponding author upon reasonable request.
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: LivePure Connector
Date Deposited: 13 Jun 2022 14:30
Last Modified: 13 Jun 2022 14:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/85569
DOI:

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