Submesoscale Surface Tidal, Vortical, and Residual Circulations in a Semienclosed Bay SCIE SCOPUS

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Title
Submesoscale Surface Tidal, Vortical, and Residual Circulations in a Semienclosed Bay
Author(s)
Won, Sang In; Kim, Sung Yong; Kim, Kyeong Ok
KIOST Author(s)
Kim, Kyeong Ok(김경옥)
Publication Year
2019-07
Abstract
We scrutinize three different components of submesoscale surface tidal, vortical, and residual circulations in a semienclosed bay using (1) observations of high-frequency radar-derived surface current maps and (2) numerical model simulations run under realistic vertical stratification and boundary conditions at O(1)-km spatial and 1-hourly temporal resolutions over a 2-year period (2013-2014). The tidal circulation is characterized by (1) the tidal ellipses and spectral contents having more baroclinic motions at the M-2 and S-2 frequencies and more barotropic motions at the K-1 frequency and (2) the temporal and spatial variability in the tidal fronts appearing as tidal ellipses with clustered shapes and opposite rotational directions. The regional vortical circulation is presented with the submesoscale eddies at diameters ranging from 3 to 12km and normalized vorticity magnitudes of 0.2 to 2 for both clockwise and counterclockwise rotations. Based on the spatial statistics of the identified submesoscale eddies and eddy kinetic energy budget analysis, the submesoscale eddies are primarily generated by the detachment of shoreline-following tidal currents at the coastal boundaries, persist for less than 1.5 days, and are dissipated dominantly via vertical buoyancy fluxes associated with bottom bathymetric interactions of the tidal currents. The residual circulation is clearly shown with the nontidal geostrophic currents associated with the pressure gradients generated by wind-driven Ekman transports against the coast and the ageostrophic low-frequency currents.
ISSN
2169-9275
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/590
DOI
10.1029/2018JC014892
Bibliographic Citation
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, v.124, no.7, pp.5105 - 5137, 2019
Publisher
AMER GEOPHYSICAL UNION
Subject
WAVE-VORTEX DECOMPOSITION; INTERNAL TIDE; UPPER OCEAN; EDDY FORMATION; FORM DRAG; PART I; EDDIES; CURRENTS; ENERGY; MESOSCALE
Keywords
submesoscale eddies; surface tidal currents; high-frequency radars; tidal polarization front; geostrophic currents; ageostrophic currents
Type
Article
Language
English
Document Type
Article
Publisher
AMER GEOPHYSICAL UNION
Related Researcher
Research Interests

Coastal Engineering,Marine Environment Model,Coastal Disaster Model,해안공학,해양환경모델링,해안재해모델

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