View in EDS HTML Full Text PDF Full Text

Localized General Vertical Coordinates for Quasi‐Eulerian Ocean Models: The Nordic Overflows Test‐Case.

Saved in:
Bibliographic Details
Title: Localized General Vertical Coordinates for Quasi‐Eulerian Ocean Models: The Nordic Overflows Test‐Case.
Authors: Bruciaferri, Diego1 (AUTHOR) diego.bruciaferri@metoffice.gov.uk, Guiavarc'h, Catherine1 (AUTHOR), Hewitt, Helene T.1 (AUTHOR), Harle, James2 (AUTHOR), Almansi, Mattia2,3 (AUTHOR), Mathiot, Pierre4 (AUTHOR), Colombo, Pedro4,5 (AUTHOR)
Source: Journal of Advances in Modeling Earth Systems. Mar2024, Vol. 16 Issue 3, p1-40. 40p.
Subject Terms: *Ocean currents, *Ocean bottom, *Ocean, Quasi-biennial oscillation (Meteorology), Scientific community, Buoyancy
Geographic Terms: Greenland, Scotland
Company/Entity: Great Britain. Meteorological Office
Abstract: A generalized methodology to deploy different types of vertical coordinate system in arbitrarily defined time‐invariant local areas of quasi‐Eulerian numerical ocean models is presented. After detailing its characteristics, we show how the general localization method can be used to improve the representation of the Nordic Seas overflows in the UK Met Office NEMO‐based eddy‐permitting global ocean configuration. Three z*‐levels with partial steps configurations localizing different types of hybrid geopotential/terrain‐following vertical coordinates in the proximity of the Greenland‐Scotland ridge are implemented and compared against a control configuration. Experiments include a series of idealized and realistic numerical simulations where the skill of the models in computing pressure forces, reducing spurious diapycnal mixing and reproducing observed properties of the Nordic Seas overflows are assessed. Numerical results prove that the localization approach proposed here can be successfully used to embed terrain‐following levels in a global geopotential levels‐based configuration, provided that the localized vertical coordinate chosen is flexible enough to allow a smooth transition between the two. In addition, our experiments show that deploying localized terrain‐following levels via the multi‐envelope method allows the crucial reduction of spurious cross‐isopycnal mixing when modeling bottom intensified buoyancy driven currents, significantly improving the realism of the Nordic Seas overflows simulations in comparison to the other configurations. Important hydrographic biases are found to similarly affect all the realistic experiments and a discussion on how their interaction with the type of localized vertical coordinate affects the realism of the simulated overflows is provided. Plain Language Summary: Numerical ocean models are arguably one of the most advanced tools the scientific community can use to study the dynamics of the world's oceans. However, the ability of an ocean model to realistically simulate ocean currents depends on the numerical techniques it employs, such as the type of vertical coordinate system. Ocean models typically implement a single type of vertical coordinate throughout the entire model domain, which is often unable to accurately represent the vast variety of physical processes driving the oceans. In this study, we propose a new method that allows different types of vertical coordinates in selected regions of the same model domain. Our method targets a particular class of ocean models (known as quasi‐Eulerian), improving the way they represent the important influence the sea floor exerts on ocean currents. After introducing our novel approach, we present the results of a series of numerical experiments where we test its skill for improving the representation of the Nordic Seas overflows, an important type of ocean current located at depth in the proximity of the Greenland‐Scotland ridge. Key Points: A general methodology to embed distinct types of vertical coordinates in local time‐invariant targeted areas of quasi‐Eulerian ocean modelsThree different hybrid geopotential/terrain‐following coordinates are localized in the Nordic overflows region of a z*‐levels global modelUsing local multi‐envelope terrain‐following levels reduces diapycnal mixing improving the realism of the simulated Nordic overflows [ABSTRACT FROM AUTHOR]
Copyright of Journal of Advances in Modeling Earth Systems is the property of Wiley-Blackwell 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.)
Database: GreenFILE
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: 8gh
DbLabel: GreenFILE
An: 176274958
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Localized General Vertical Coordinates for Quasi‐Eulerian Ocean Models: The Nordic Overflows Test‐Case.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Bruciaferri%2C+Diego%22">Bruciaferri, Diego</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> diego.bruciaferri@metoffice.gov.uk</i><br /><searchLink fieldCode="AR" term="%22Guiavarc'h%2C+Catherine%22">Guiavarc'h, Catherine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hewitt%2C+Helene+T%2E%22">Hewitt, Helene T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Harle%2C+James%22">Harle, James</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Almansi%2C+Mattia%22">Almansi, Mattia</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mathiot%2C+Pierre%22">Mathiot, Pierre</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Colombo%2C+Pedro%22">Colombo, Pedro</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Journal+of+Advances+in+Modeling+Earth+Systems%22">Journal of Advances in Modeling Earth Systems</searchLink>. Mar2024, Vol. 16 Issue 3, p1-40. 40p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Ocean+currents%22">Ocean currents</searchLink><br />*<searchLink fieldCode="DE" term="%22Ocean+bottom%22">Ocean bottom</searchLink><br />*<searchLink fieldCode="DE" term="%22Ocean%22">Ocean</searchLink><br /><searchLink fieldCode="DE" term="%22Quasi-biennial+oscillation+%28Meteorology%29%22">Quasi-biennial oscillation (Meteorology)</searchLink><br /><searchLink fieldCode="DE" term="%22Scientific+community%22">Scientific community</searchLink><br /><searchLink fieldCode="DE" term="%22Buoyancy%22">Buoyancy</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Greenland%22">Greenland</searchLink><br /><searchLink fieldCode="DE" term="%22Scotland%22">Scotland</searchLink>
– Name: SubjectCompany
  Label: Company/Entity
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Great+Britain%2E+Meteorological+Office%22">Great Britain. Meteorological Office</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A generalized methodology to deploy different types of vertical coordinate system in arbitrarily defined time‐invariant local areas of quasi‐Eulerian numerical ocean models is presented. After detailing its characteristics, we show how the general localization method can be used to improve the representation of the Nordic Seas overflows in the UK Met Office NEMO‐based eddy‐permitting global ocean configuration. Three z*‐levels with partial steps configurations localizing different types of hybrid geopotential/terrain‐following vertical coordinates in the proximity of the Greenland‐Scotland ridge are implemented and compared against a control configuration. Experiments include a series of idealized and realistic numerical simulations where the skill of the models in computing pressure forces, reducing spurious diapycnal mixing and reproducing observed properties of the Nordic Seas overflows are assessed. Numerical results prove that the localization approach proposed here can be successfully used to embed terrain‐following levels in a global geopotential levels‐based configuration, provided that the localized vertical coordinate chosen is flexible enough to allow a smooth transition between the two. In addition, our experiments show that deploying localized terrain‐following levels via the multi‐envelope method allows the crucial reduction of spurious cross‐isopycnal mixing when modeling bottom intensified buoyancy driven currents, significantly improving the realism of the Nordic Seas overflows simulations in comparison to the other configurations. Important hydrographic biases are found to similarly affect all the realistic experiments and a discussion on how their interaction with the type of localized vertical coordinate affects the realism of the simulated overflows is provided. Plain Language Summary: Numerical ocean models are arguably one of the most advanced tools the scientific community can use to study the dynamics of the world's oceans. However, the ability of an ocean model to realistically simulate ocean currents depends on the numerical techniques it employs, such as the type of vertical coordinate system. Ocean models typically implement a single type of vertical coordinate throughout the entire model domain, which is often unable to accurately represent the vast variety of physical processes driving the oceans. In this study, we propose a new method that allows different types of vertical coordinates in selected regions of the same model domain. Our method targets a particular class of ocean models (known as quasi‐Eulerian), improving the way they represent the important influence the sea floor exerts on ocean currents. After introducing our novel approach, we present the results of a series of numerical experiments where we test its skill for improving the representation of the Nordic Seas overflows, an important type of ocean current located at depth in the proximity of the Greenland‐Scotland ridge. Key Points: A general methodology to embed distinct types of vertical coordinates in local time‐invariant targeted areas of quasi‐Eulerian ocean modelsThree different hybrid geopotential/terrain‐following coordinates are localized in the Nordic overflows region of a z*‐levels global modelUsing local multi‐envelope terrain‐following levels reduces diapycnal mixing improving the realism of the simulated Nordic overflows [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Advances in Modeling Earth Systems is the property of Wiley-Blackwell 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=8gh&AN=176274958
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1029/2023MS003893
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 40
        StartPage: 1
    Subjects:
      – SubjectFull: Ocean currents
        Type: general
      – SubjectFull: Ocean bottom
        Type: general
      – SubjectFull: Ocean
        Type: general
      – SubjectFull: Quasi-biennial oscillation (Meteorology)
        Type: general
      – SubjectFull: Scientific community
        Type: general
      – SubjectFull: Buoyancy
        Type: general
      – SubjectFull: Greenland
        Type: general
      – SubjectFull: Scotland
        Type: general
      – SubjectFull: Great Britain. Meteorological Office
        Type: general
    Titles:
      – TitleFull: Localized General Vertical Coordinates for Quasi‐Eulerian Ocean Models: The Nordic Overflows Test‐Case.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Bruciaferri, Diego
      – PersonEntity:
          Name:
            NameFull: Guiavarc'h, Catherine
      – PersonEntity:
          Name:
            NameFull: Hewitt, Helene T.
      – PersonEntity:
          Name:
            NameFull: Harle, James
      – PersonEntity:
          Name:
            NameFull: Almansi, Mattia
      – PersonEntity:
          Name:
            NameFull: Mathiot, Pierre
      – PersonEntity:
          Name:
            NameFull: Colombo, Pedro
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 03
              Text: Mar2024
              Type: published
              Y: 2024
          Identifiers:
            – Type: issn-print
              Value: 19422466
          Numbering:
            – Type: volume
              Value: 16
            – Type: issue
              Value: 3
          Titles:
            – TitleFull: Journal of Advances in Modeling Earth Systems
              Type: main
ResultId 1