Changeset 11682


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

Sunday

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1 edited

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  • NEMO/trunk/doc/latex/NEMO/subfiles/chap_ZDF.tex

    r11681 r11682  
    551551surface drift and penetration depth. There are three options: 
    552552\begin{enumerate} 
    553   \item \texttt{nn_osm_wave=0}. In this case the Stokes drift is 
     553  \item \np{nn\_osm\_wave=0}. Default value in \texttt{namelist\_ref}. In this case the Stokes drift is 
    554554      assumed to be parallel to the surface wind stress, with 
    555555      magnitude consistent with a constant turbulent Langmuir number 
    556     $\mathrm{La}_t= \texttt{rn_m_la}$ i.e.\ 
    557     $u_[s0}=\tau/(\texttt{rn_m_la}^2\rho_0)$. 
    558   \item \texttt{nn_osm_wave=1}. In this case the Stokes drift is 
     556    $\mathrm{La}_t=$ \np{rn\_m\_la} i.e.\ 
     557    $u_{s0}=\tau/(\np{rn\_m\_la}^2\rho_0)$.  Default value of 
     558    \np{rn\_m\_la} is 0.3. The Stokes penetration 
     559      depth $\delta = $ \np{rn\_osm\_dstokes}; this has default value 
     560      of \SI{5 m}. 
     561  
     562  \item \np{nn\_osm\_wave=1}. In this case the Stokes drift is 
    559563      assumed to be parallel to the surface wind stress, with 
    560564      magnitude as in the classical Pierson-Moskowitz wind-sea 
    561       spectrum. 
    562     \item \texttt{nn_osm_wave=2}. In this case the Stokes drift is 
    563       taken from  ECMWF wave model output. Significant wave height and 
    564       wave-mean period are used to calciulate the Stokes penetration 
    565       depth, followingh the approach set out in Breivik(XXxx) 
    566  
     565      spectrum.  Significant wave height and 
     566      wave-mean period taken from this spectrum are used to calculate the Stokes penetration 
     567      depth, following the approach set out in Breivik(XXxx) 
     568  
     569    \item \np{nn\_osm\_wave=2}. In this case the Stokes drift is 
     570      taken from  ECMWF wave model output, though only the component parallel 
     571      to the wind stress is retained. Significant wave height and 
     572      wave-mean period from ECMWF wave model output are used to calculate the Stokes penetration 
     573      depth, following the approach set out in Breivik(XXxx). 
     574 
     575    \end{enumerate} 
     576 
     577    Others refer to the treatment of diffusion and viscosity beneath 
     578    the surface boundary layer: 
     579\begin{enumerate} 
     580   \item \np{ln\_kpprimix}.  Default is \np{.true.}. Switches on KPP-style Ri #-dependent 
     581     mixing below the surface boundary layer. If this is set 
     582     \np{.true.}  the following variable settings are honoured: 
     583    \item \np{rn\_riinfty}. Critical value of local Ri # below which 
     584      shear instability increases vertical mixing from background value. 
     585    \item \np{rn\_difri}. Critical value of local Ri # below which 
     586      shear instability increases vertical mixing from background value. 
    567587  \end{enumerate} 
     588  and the last to diagnostic outputs: 
     589  \begin{list} 
     590    \item \np{ln\_dia\_osm}. Default is \np{.false.}; allows XIOS output of OSMOSIS internal fields. 
     591  \end{list} 
     592 
     593     
     594    Obsolete namelist parameters include: 
     595  \begin{enumerate} 
     596   \item \np{ln\_use\_osm\_la}. With \np{nn\_osm\_wave=0}, 
     597      \np{rn\_osm\_dstokes} is always used to specify the Stokes 
     598      penetration depth. 
     599 
     600    \item \np{nn\_ave}. Choice of averaging method for KPP-style Ri# 
     601      mixing. Not taken account of. 
     602  
     603     \item \np{rn\_osm\_hbl0} 
     604     \item \np{ln\_dia\_osm} 
     605      \end{enumerate} 
     606 
    568607\subsubsection{Summary} 
    569608Much of the time the turbulent motions in the ocean surface boundary 
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