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Title: Baroclinic Residual Circulation and Mass Transport Due to Internal Tides

Abstract

Baroclinic (BC) tidal residual circulation due to internal tides is investigated around islands over a shallow ridge using a numerical ocean model. Internal tides enhance vertical mixing over shallow slopes, leading to horizontal density gradients that drive BC residual circulation along the main thermocline. For a strongly stratified summer case, the vertical diffusivity estimated by the Mellor and Yamada turbulence closure model exceeds 1 × 10-2 m2 s-1, and the velocity of BC residual circulations reaches 0.2 m s-1. The magnitude of BC residual circulation is larger than that of barotropic residual tidal circulation, implying that BC residual circulation due to internal tides plays an important role in coastal ocean circulation. Furthermore, BC residual flow accounts for an equal percentage (5%) of the total tidal kinetic energy as the barotropic residual flow under summer stratification conditions. Results from a coupled sediment resuspension and transport model show the growth of intermediate nepheloid layers formed by strong bottom shear stress and BC residual flow. The residual component contributes largely (23% of the total in summer) to the total suspended sediment flux. Seasonal variability is explored, with weaker winter stratification leading to reduced mixing, and thus weaker BC residual circulation and sediment flux.more » Lastly, the magnitude of the BC residual circulation is also shown to be proportional to the square of the tidal amplitude.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Ibaraki Univ., Ibaraki (Japan). Center for Water Environment Studies
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Tokyo Univ. of Marine Science and Technology, Tokyo (Japan)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Japan Society for the Promotion of Science (JSPS)
OSTI Identifier:
1608088
Report Number(s):
LLNL-JRNL-777447
Journal ID: ISSN 2169-9275; 970845
Grant/Contract Number:  
AC52-07NA27344; JPMJCR12A6
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Oceans
Additional Journal Information:
Journal Volume: 125; Journal Issue: 4; Journal ID: ISSN 2169-9275
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES

Citation Formats

Masunaga, Eiji, Arthur, Robert S., and Yamazaki, Hidekatsu. Baroclinic Residual Circulation and Mass Transport Due to Internal Tides. United States: N. p., 2020. Web. doi:10.1029/2019JC015316.
Masunaga, Eiji, Arthur, Robert S., & Yamazaki, Hidekatsu. Baroclinic Residual Circulation and Mass Transport Due to Internal Tides. United States. doi:https://doi.org/10.1029/2019JC015316
Masunaga, Eiji, Arthur, Robert S., and Yamazaki, Hidekatsu. Tue . "Baroclinic Residual Circulation and Mass Transport Due to Internal Tides". United States. doi:https://doi.org/10.1029/2019JC015316. https://www.osti.gov/servlets/purl/1608088.
@article{osti_1608088,
title = {Baroclinic Residual Circulation and Mass Transport Due to Internal Tides},
author = {Masunaga, Eiji and Arthur, Robert S. and Yamazaki, Hidekatsu},
abstractNote = {Baroclinic (BC) tidal residual circulation due to internal tides is investigated around islands over a shallow ridge using a numerical ocean model. Internal tides enhance vertical mixing over shallow slopes, leading to horizontal density gradients that drive BC residual circulation along the main thermocline. For a strongly stratified summer case, the vertical diffusivity estimated by the Mellor and Yamada turbulence closure model exceeds 1 × 10-2 m2 s-1, and the velocity of BC residual circulations reaches 0.2 m s-1. The magnitude of BC residual circulation is larger than that of barotropic residual tidal circulation, implying that BC residual circulation due to internal tides plays an important role in coastal ocean circulation. Furthermore, BC residual flow accounts for an equal percentage (5%) of the total tidal kinetic energy as the barotropic residual flow under summer stratification conditions. Results from a coupled sediment resuspension and transport model show the growth of intermediate nepheloid layers formed by strong bottom shear stress and BC residual flow. The residual component contributes largely (23% of the total in summer) to the total suspended sediment flux. Seasonal variability is explored, with weaker winter stratification leading to reduced mixing, and thus weaker BC residual circulation and sediment flux. Lastly, the magnitude of the BC residual circulation is also shown to be proportional to the square of the tidal amplitude.},
doi = {10.1029/2019JC015316},
journal = {Journal of Geophysical Research. Oceans},
number = 4,
volume = 125,
place = {United States},
year = {2020},
month = {3}
}

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