# Changeset 11683

Ignore:
Timestamp:
2019-10-11T00:16:09+02:00 (12 months ago)
Message:

Monday morning

File:
1 edited

### Legend:

Unmodified
 r11682 Most of the namelist options refer to how to specify the Stokes surface drift and penetration depth. There are three options: \begin{enumerate} \item \np{nn\_osm\_wave=0}. Default value in \texttt{namelist\_ref}. In this case the Stokes drift is \begin{description} \item \np{nn\_osm\_wave=0} Default value in \texttt{namelist\_ref}. In this case the Stokes drift is assumed to be parallel to the surface wind stress, with magnitude consistent with a constant turbulent Langmuir number of \SI{5 m}. \item \np{nn\_osm\_wave=1}. In this case the Stokes drift is \item \np{nn\_osm\_wave=1} In this case the Stokes drift is assumed to be parallel to the surface wind stress, with magnitude as in the classical Pierson-Moskowitz wind-sea depth, following the approach set out in Breivik(XXxx) \item \np{nn\_osm\_wave=2}. In this case the Stokes drift is \item \np{nn\_osm\_wave=2} In this case the Stokes drift is taken from  ECMWF wave model output, though only the component parallel to the wind stress is retained. Significant wave height and depth, following the approach set out in Breivik(XXxx). \end{enumerate} \end{description} Others refer to the treatment of diffusion and viscosity beneath the surface boundary layer: \begin{enumerate} \item \np{ln\_kpprimix}.  Default is \np{.true.}. Switches on KPP-style Ri #-dependent \begin{description} \item \np{ln\_kpprimix}  Default is \np{.true.}. Switches on KPP-style Ri \#-dependent mixing below the surface boundary layer. If this is set \np{.true.}  the following variable settings are honoured: \item \np{rn\_riinfty}. Critical value of local Ri # below which \item \np{rn\_riinfty} Critical value of local Ri \# below which shear instability increases vertical mixing from background value. \item \np{rn\_difri}. Critical value of local Ri # below which shear instability increases vertical mixing from background value. \end{enumerate} and the last to diagnostic outputs: \begin{list} \item \np{ln\_dia\_osm}. Default is \np{.false.}; allows XIOS output of OSMOSIS internal fields. \end{list} Obsolete namelist parameters include: \begin{enumerate} \item \np{ln\_use\_osm\_la}. With \np{nn\_osm\_wave=0}, \item \np{rn\_difri} Maximum value of Ri \#-dependent mixing at $\mathrm{Ri}=0$. \item \np{ln\_convmix} If \texttt{.true.} then, where water column is unstable, specify diffusivity equal to \np{rn\_dif\_conv} (default value is 1 ms$^{-2}$). \end{description} Diagnostic output is controlled by: \begin{description} \item \np{ln\_dia\_osm} Default is \np{.false.}; allows XIOS output of OSMOSIS internal fields. \end{description} Obsolete namelist parameters include: \begin{description} \item \np{ln\_use\_osm\_la} With \np{nn\_osm\_wave=0}, \np{rn\_osm\_dstokes} is always used to specify the Stokes penetration depth. \item \np{nn\_ave}. Choice of averaging method for KPP-style Ri# \item \np{nn\_ave} Choice of averaging method for KPP-style Ri# mixing. Not taken account of. \item \np{rn\_osm\_hbl0} \item \np{ln\_dia\_osm} \end{enumerate} \item \np{rn\_osm\_hbl0} Depth of initial boundary layer is now set by a desnity criterion similar to that used in \end{description} \subsubsection{Summary}