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2020WP/PHYPRO-01_agn_OSMOSIS_science – NEMO

Version 6 (modified by agn, 3 years ago) (diff)



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Action PHYPRO-01_agn_OSMOSIS_science
PI(S) George Nurser
Digest Improvements to OSMOSIS OBL to improve behaviour in shelf-sea areas and under sea ice
Dependencies If any
Branch source:/NEMO/branches/{YEAR}/dev_r{REV}_{ACTION_NAME}
Previewer(s) Names
Reviewer(s) Names
Ticket #2352


Improve OSMOSIS ocean boundary layer (OBL) model in 3 areas:

  1. Ensure consistent behaviour of OSMOSIS-OBL under ice. Revert to classic shear turbulence based on ice-ocean turbulent friction velocity where ice areal coverage is high; scale with ice fraction between shear turbulence and Langmuir turbulence model. Where Stokes drift unavailable, move to parametrised form.
  1. Improve representation of OSMOSIS-OBL mixing in equatorial regions. Include mixing associated with shear of mean flow as in equatorial undercurrent.
  1. Mixing in shelf seas. The OSMOSIS-OBL is primarily a surface boundary layer model and so is not set up for bottom-driven tidal mixing. We intend to transition to GLS in shelf seas.

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The development branch for 2019-WP action VALID-02_GeorgeN-evalOSMOSIS has recently been synchronized with source:/NEMO/trunk@12925 (changesets [12928] and [12934])and will form the basis for the source-code "streamlining" activities of action 2020WP/ENHANCE-14_smueller_OSMOSIS_streamlining. A new branch with the new physics will be spun-off this streamlined branch 2020WP/ENHANCE-14_smueller_OSMOSIS_streamlining.

Changes will be mostly restricted to the routine zdfosm.F90. There will be a new subroutine added to handle the shear-induced mixing.

Documentation updates

An extra paragraph or two will be added to the documentation in section 9.1.5 of the manual.


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