Changeset 11681


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Timestamp:
2019-10-11T00:15:54+02:00 (11 months ago)
Author:
agn
Message:

Wednsday's changes

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1 edited

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

    r11680 r11681  
    546546\end{listing} 
    547547 
     548%-------------------------------------------------------------------------------------------------------------- 
     549\paragraph{Namelist choices} 
     550Most of the namelist options refer to how to specify the Stokes 
     551surface drift and penetration depth. There are three options: 
     552\begin{enumerate} 
     553  \item \texttt{nn_osm_wave=0}. In this case the Stokes drift is 
     554      assumed to be parallel to the surface wind stress, with 
     555      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 
     559      assumed to be parallel to the surface wind stress, with 
     560      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 
     567  \end{enumerate} 
     568\subsubsection{Summary} 
    548569Much of the time the turbulent motions in the ocean surface boundary 
    549570layer (OSBL) are not given by 
     
    603624  \nu_{\ast}= \left\{ u_*^3 \left[1-\exp(-1.5 \mathrm{La}_t^2})\right]+w_{*L}^3\right\}^{1/3}. 
    604625\end{equation} 
    605 For the unstable boundary layer this is merged with the standard convective velocity scale $w_{*C}=\left(\overline{w^\prime b^\prime}_0 \,h_\mathrm{ml}\right)^{1/3}$, where $\overline{w^\prime b^\prime}_0$ is the upwards surface buoyancy flux to give: 
     626For the unstable boundary layer this is merged with the standard convective velocity scale $w_{*C}=\left(\overline{w^\prime b^\prime}_0 \,h_\mathrm{ml}\right)^{1/3}$, where $\overline{w^\prime b^\prime}_0$ is the upwards surface buoyancy flux, to give: 
    606627\begin{equation}\label{eq:vel-scale-unstable} 
    607628\omega_* = \left(\nu_*^3 + 0.5 w_{*C}^3\right)^{1/3}. 
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