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Numerical simulation of upper ocean responses to the passage of a submesoscale eddy.

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Title: Numerical simulation of upper ocean responses to the passage of a submesoscale eddy.
Authors: Fan, Yalin1 (AUTHOR) yalin.fan@nrlssc.navy.mil, Rydbeck, Adam1 (AUTHOR), Thoppil, Prasad1 (AUTHOR), Yu, Zhitao1 (AUTHOR)
Source: Ocean Modelling. Aug2023, Vol. 184, pN.PAG-N.PAG. 1p.
Subjects: Eddies, Large eddy simulation models, Offshore sailing, Atmospheric boundary layer, Water currents, Boundary layer (Aerodynamics), General circulation model
Abstract: In this study, a large eddy simulation model (LES) is used to investigate the effect of an idealized westward propagating submesoscale eddy on ocean surface boundary layer turbulence. Large scale forcing (LSF) terms are introduced to the model to represent the effects of submesoscale eddies using the scale separation approach. Although re-stratification is observed at the arrival of the eddy center, consistent with previous studies, strong mixing and deepening is detected before/after the arrival of the eddy center. LES experiments are conducted to investigate the mechanism behind these dynamical responses, and explore the relative importance of the LSF terms. The interaction among these forcing terms is shown to be highly nonlinear, and the combined effects of buoyancy and momentum eddy forcing dominate the boundary layer response to the submesoscale eddy. While buoyancy flux is responsible for the enhanced mixing in the boundary layer, our analysis suggests that the momentum eddy forcing can significantly alter the timing of the enhanced mixing and boost its strength through generating strong mean current in the water column that accelerates westward density advection generated by the buoyancy eddy forcing. The lighter/heavier fluid intrusion brought by the mean flow leads to strong upwelling/downwelling, enhanced mixing and deepening of the mixed layer before the arrival of the eddy. Simulations using a general circulation model do not show similar response in the upper ocean because the K profile parameterization used in the model is a function of vertical shear only, and cannot represent the enhanced turbulence due to lateral mixing brought by the submesoscale eddy. Eddy distortion due to its asymmetric decay with time and northward Ekman transport generated by the wind stress also leads to substantial differences in boundary layer responses at different locations relative to the eddy center. • Boundary layer (BL) response to a submesoscale eddy. • Combined effects of buoyancy and momentum eddy forcing dominate the BL response. • Re-stratification at eddy center while strong mixing and deepening before/after. • Momentum eddy forcing generated mean flow alter timing/strength of enhanced mixing. [ABSTRACT FROM AUTHOR]
Copyright of Ocean Modelling is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 169753991
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  Label: Title
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  Data: Numerical simulation of upper ocean responses to the passage of a submesoscale eddy.
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  Data: <searchLink fieldCode="AR" term="%22Fan%2C+Yalin%22">Fan, Yalin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yalin.fan@nrlssc.navy.mil</i><br /><searchLink fieldCode="AR" term="%22Rydbeck%2C+Adam%22">Rydbeck, Adam</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Thoppil%2C+Prasad%22">Thoppil, Prasad</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Zhitao%22">Yu, Zhitao</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ocean+Modelling%22">Ocean Modelling</searchLink>. Aug2023, Vol. 184, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Eddies%22">Eddies</searchLink><br /><searchLink fieldCode="DE" term="%22Large+eddy+simulation+models%22">Large eddy simulation models</searchLink><br /><searchLink fieldCode="DE" term="%22Offshore+sailing%22">Offshore sailing</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+boundary+layer%22">Atmospheric boundary layer</searchLink><br /><searchLink fieldCode="DE" term="%22Water+currents%22">Water currents</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+layer+%28Aerodynamics%29%22">Boundary layer (Aerodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22General+circulation+model%22">General circulation model</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this study, a large eddy simulation model (LES) is used to investigate the effect of an idealized westward propagating submesoscale eddy on ocean surface boundary layer turbulence. Large scale forcing (LSF) terms are introduced to the model to represent the effects of submesoscale eddies using the scale separation approach. Although re-stratification is observed at the arrival of the eddy center, consistent with previous studies, strong mixing and deepening is detected before/after the arrival of the eddy center. LES experiments are conducted to investigate the mechanism behind these dynamical responses, and explore the relative importance of the LSF terms. The interaction among these forcing terms is shown to be highly nonlinear, and the combined effects of buoyancy and momentum eddy forcing dominate the boundary layer response to the submesoscale eddy. While buoyancy flux is responsible for the enhanced mixing in the boundary layer, our analysis suggests that the momentum eddy forcing can significantly alter the timing of the enhanced mixing and boost its strength through generating strong mean current in the water column that accelerates westward density advection generated by the buoyancy eddy forcing. The lighter/heavier fluid intrusion brought by the mean flow leads to strong upwelling/downwelling, enhanced mixing and deepening of the mixed layer before the arrival of the eddy. Simulations using a general circulation model do not show similar response in the upper ocean because the K profile parameterization used in the model is a function of vertical shear only, and cannot represent the enhanced turbulence due to lateral mixing brought by the submesoscale eddy. Eddy distortion due to its asymmetric decay with time and northward Ekman transport generated by the wind stress also leads to substantial differences in boundary layer responses at different locations relative to the eddy center. • Boundary layer (BL) response to a submesoscale eddy. • Combined effects of buoyancy and momentum eddy forcing dominate the BL response. • Re-stratification at eddy center while strong mixing and deepening before/after. • Momentum eddy forcing generated mean flow alter timing/strength of enhanced mixing. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ocean Modelling is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ocemod.2023.102209
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Eddies
        Type: general
      – SubjectFull: Large eddy simulation models
        Type: general
      – SubjectFull: Offshore sailing
        Type: general
      – SubjectFull: Atmospheric boundary layer
        Type: general
      – SubjectFull: Water currents
        Type: general
      – SubjectFull: Boundary layer (Aerodynamics)
        Type: general
      – SubjectFull: General circulation model
        Type: general
    Titles:
      – TitleFull: Numerical simulation of upper ocean responses to the passage of a submesoscale eddy.
        Type: main
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            NameFull: Fan, Yalin
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            NameFull: Rydbeck, Adam
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            NameFull: Thoppil, Prasad
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            NameFull: Yu, Zhitao
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          Dates:
            – D: 01
              M: 08
              Text: Aug2023
              Type: published
              Y: 2023
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              Value: 184
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            – TitleFull: Ocean Modelling
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