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Surface waves affect frontogenesis

Journal Article · · Journal of Geophysical Research. Oceans
DOI:https://doi.org/10.1002/2015JC011563· OSTI ID:1484630
 [1];  [1];  [2];  [3]
  1. Brown Univ., Providence, RI (United States)
  2. Univ. of Colorado, Boulder, CO (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Here, this paper provides a detailed analysis of momentum, angular momentum, vorticity, and energy budgets of a submesoscale front undergoing frontogenesis driven by an upper–ocean, submesoscale eddy field in a Large Eddy Simulation (LES). The LES solves the wave–averaged, or Craik–Leibovich, equations in order to account for the Stokes forces that result from interactions between nonbreaking surface waves and currents, and resolves both submesoscale eddies and boundary layer turbulence down to 4.9 m × 4.9 m × 1.25 m grid scales. It is found that submesoscale frontogenesis differs from traditional frontogenesis theory due to four effects: Stokes forces, momentum and kinetic energy transfer from submesoscale eddies to frontal secondary circulations, resolved turbulent stresses, and unbalanced torque. In the energy, momentum, angular momentum, and vorticity budgets for the frontal overturning circulation, the Stokes shear force is a leading–order contributor, typically either the second or third largest source of frontal overturning. These effects violate hydrostatic and thermal wind balances during submesoscale frontogenesis. The effect of the Stokes shear force becomes stronger with increasing alignment of the front and Stokes shear and with a nondimensional scaling. The Stokes shear force and momentum transfer from submesoscale eddies significantly energize the frontal secondary circulation along with the buoyancy.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1484630
Report Number(s):
LA-UR--15-29048
Journal Information:
Journal of Geophysical Research. Oceans, Journal Name: Journal of Geophysical Research. Oceans Journal Issue: 5 Vol. 121; ISSN 2169-9275
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Small-scale open ocean currents have large effects on wind wave heights: SMALL-SCALE CURRENTS AND WAVE HEIGHTS journal June 2017
Submesoscale surface fronts and filaments: secondary circulation, buoyancy flux, and frontogenesis journal June 2017
Frontogenesis and frontal arrest of a dense filament in the oceanic surface boundary layer journal December 2017
Langmuir turbulence and filament frontogenesis in the oceanic surface boundary layer journal October 2019
On the physical mechanisms of the two-way coupling between a surface wave field and a circulation consisting of a roll and streak journal October 2019
Ocean‐Wave‐Atmosphere Interaction Processes in a Fully Coupled Modeling System journal November 2019
The Contribution of Surface and Submesoscale Processes to Turbulence in the Open Ocean Surface Boundary Layer journal December 2019
Comparing Ocean Surface Boundary Vertical Mixing Schemes Including Langmuir Turbulence journal November 2019
Integrated Observations of Global Surface Winds, Currents, and Waves: Requirements and Challenges for the Next Decade journal July 2019

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