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Changeset 11422 for NEMO/branches/2019/fix_vvl_ticket1791/doc/latex/NEMO/subfiles/annex_iso.tex – NEMO

Ignore:
Timestamp:
2019-08-08T15:40:47+02:00 (5 years ago)
Author:
jchanut
Message:

#1791, merge with trunk

Location:
NEMO/branches/2019/fix_vvl_ticket1791/doc
Files:
4 edited

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  • NEMO/branches/2019/fix_vvl_ticket1791/doc/latex/NEMO

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  • NEMO/branches/2019/fix_vvl_ticket1791/doc/latex/NEMO/subfiles/annex_iso.tex

    r10442 r11422  
    44\newcommand{\rML}[1][i]{\ensuremath{_{\mathrm{ML}\,#1}}} 
    55\newcommand{\rMLt}[1][i]{\tilde{r}_{\mathrm{ML}\,#1}} 
    6 \newcommand{\triad}[6][]{\ensuremath{{}_{#2}^{#3}{\mathbb{#4}_{#1}}_{#5}^{\,#6}}} 
     6%% Move to ../../global/new_cmds.tex to avoid error with \listoffigures 
     7%\newcommand{\triad}[6][]{\ensuremath{{}_{#2}^{#3}{\mathbb{#4}_{#1}}_{#5}^{\,#6}} 
    78\newcommand{\triadd}[5]{\ensuremath{{}_{#1}^{#2}{\mathbb{#3}}_{#4}^{\,#5}}} 
    89\newcommand{\triadt}[5]{\ensuremath{{}_{#1}^{#2}{\tilde{\mathbb{#3}}}_{#4}^{\,#5}}} 
     
    5253  the vertical skew flux is further reduced to ensure no vertical buoyancy flux, 
    5354  giving an almost pure horizontal diffusive tracer flux within the mixed layer. 
    54   This is similar to the tapering suggested by \citet{Gerdes1991}. See \autoref{subsec:Gerdes-taper} 
     55  This is similar to the tapering suggested by \citet{gerdes.koberle.ea_CD91}. See \autoref{subsec:Gerdes-taper} 
    5556\item[\np{ln\_botmix\_triad}] 
    5657  See \autoref{sec:iso_bdry}.  
     
    7172\label{sec:iso} 
    7273 
    73 We have implemented into \NEMO a scheme inspired by \citet{Griffies_al_JPO98}, 
     74We have implemented into \NEMO a scheme inspired by \citet{griffies.gnanadesikan.ea_JPO98}, 
    7475but formulated within the \NEMO framework, using scale factors rather than grid-sizes. 
    7576 
     
    194195\subsection{Expression of the skew-flux in terms of triad slopes} 
    195196 
    196 \citep{Griffies_al_JPO98} introduce a different discretization of the off-diagonal terms that 
     197\citep{griffies.gnanadesikan.ea_JPO98} introduce a different discretization of the off-diagonal terms that 
    197198nicely solves the problem. 
    198199% Instead of multiplying the mean slope calculated at the $u$-point by 
     
    201202\begin{figure}[tb] 
    202203  \begin{center} 
    203     \includegraphics[width=1.05\textwidth]{Fig_GRIFF_triad_fluxes} 
     204    \includegraphics[width=\textwidth]{Fig_GRIFF_triad_fluxes} 
    204205    \caption{ 
    205206      \protect\label{fig:ISO_triad} 
     
    265266\begin{figure}[tb] 
    266267  \begin{center} 
    267     \includegraphics[width=0.80\textwidth]{Fig_GRIFF_qcells} 
     268    \includegraphics[width=\textwidth]{Fig_GRIFF_qcells} 
    268269    \caption{ 
    269270      \protect\label{fig:qcells} 
     
    473474 
    474475To complete the discretization we now need only specify the triad volumes $_i^k\mathbb{V}_{i_p}^{k_p}$. 
    475 \citet{Griffies_al_JPO98} identifies these $_i^k\mathbb{V}_{i_p}^{k_p}$ as the volumes of the quarter cells, 
     476\citet{griffies.gnanadesikan.ea_JPO98} identifies these $_i^k\mathbb{V}_{i_p}^{k_p}$ as the volumes of the quarter cells, 
    476477defined in terms of the distances between $T$, $u$,$f$ and $w$-points. 
    477478This is the natural discretization of \autoref{eq:cts-var}. 
     
    658659\begin{figure}[h] 
    659660  \begin{center} 
    660     \includegraphics[width=0.60\textwidth]{Fig_GRIFF_bdry_triads} 
     661    \includegraphics[width=\textwidth]{Fig_GRIFF_bdry_triads} 
    661662    \caption{ 
    662663      \protect\label{fig:bdry_triads} 
     
    685686As discussed in \autoref{subsec:LDF_slp_iso}, 
    686687iso-neutral slopes relative to geopotentials must be bounded everywhere, 
    687 both for consistency with the small-slope approximation and for numerical stability \citep{Cox1987, Griffies_Bk04}. 
     688both for consistency with the small-slope approximation and for numerical stability \citep{cox_OM87, griffies_bk04}. 
    688689The bound chosen in \NEMO is applied to each component of the slope separately and 
    689690has a value of $1/100$ in the ocean interior. 
     
    732733\[ 
    733734  % \label{eq:iso_tensor_ML} 
    734   D^{lT}=\nabla {\rm {\bf .}}\left( {A^{lT}\;\Re \;\nabla T} \right) \qquad 
     735  D^{lT}=\nabla {\mathrm {\mathbf .}}\left( {A^{lT}\;\Re \;\nabla T} \right) \qquad 
    735736  \mbox{with}\quad \;\;\Re =\left( {{ 
    736737        \begin{array}{*{20}c} 
     
    829830    (\eg the green triad $i_p=1/2,k_p=-1/2$) are tapered to the appropriate basal triad.} 
    830831  % } 
    831   \includegraphics[width=0.60\textwidth]{Fig_GRIFF_MLB_triads} 
     832  \includegraphics[width=\textwidth]{Fig_GRIFF_MLB_triads} 
    832833\end{figure} 
    833834% >>>>>>>>>>>>>>>>>>>>>>>>>>>> 
     
    847848\[ 
    848849  % \label{eq:iso_tensor_ML2} 
    849   D^{lT}=\nabla {\rm {\bf .}}\left( {A^{lT}\;\Re \;\nabla T} \right) \qquad 
     850  D^{lT}=\nabla {\mathrm {\mathbf .}}\left( {A^{lT}\;\Re \;\nabla T} \right) \qquad 
    850851  \mbox{with}\quad \;\;\Re =\left( {{ 
    851852        \begin{array}{*{20}c} 
     
    859860\footnote{ 
    860861  To ensure good behaviour where horizontal density gradients are weak, 
    861   we in fact follow \citet{Gerdes1991} and 
     862  we in fact follow \citet{gerdes.koberle.ea_CD91} and 
    862863  set $\rML^*=\mathrm{sgn}(\tilde{r}_i)\min(|\rMLt^2/\tilde{r}_i|,|\tilde{r}_i|)-\sigma_i$. 
    863864} 
     
    865866This approach is similar to multiplying the iso-neutral diffusion coefficient by 
    866867$\tilde{r}_{\mathrm{max}}^{-2}\tilde{r}_i^{-2}$ for steep slopes, 
    867 as suggested by \citet{Gerdes1991} (see also \citet{Griffies_Bk04}). 
     868as suggested by \citet{gerdes.koberle.ea_CD91} (see also \citet{griffies_bk04}). 
    868869Again it is applied separately to each triad $_i^k\mathbb{R}_{i_p}^{k_p}$ 
    869870 
     
    925926 
    926927However, when \np{ln\_traldf\_triad} is set true, 
    927 \NEMO instead implements eddy induced advection according to the so-called skew form \citep{Griffies_JPO98}. 
     928\NEMO instead implements eddy induced advection according to the so-called skew form \citep{griffies_JPO98}. 
    928929It is based on a transformation of the advective fluxes using the non-divergent nature of the eddy induced velocity. 
    929930For example in the (\textbf{i},\textbf{k}) plane, 
     
    11391140it is equivalent to a horizontal eiv (eddy-induced velocity) that is uniform within the mixed layer 
    11401141\autoref{eq:eiv_v}. 
    1141 This ensures that the eiv velocities do not restratify the mixed layer \citep{Treguier1997,Danabasoglu_al_2008}. 
     1142This ensures that the eiv velocities do not restratify the mixed layer \citep{treguier.held.ea_JPO97,danabasoglu.ferrari.ea_JC08}. 
    11421143Equivantly, in terms of the skew-flux formulation we use here, 
    11431144the linear slope tapering within the mixed-layer gives a linearly varying vertical flux, 
     
    11531154$uw$ (integer +1/2 $i$, integer $j$, integer +1/2 $k$) and $vw$ (integer $i$, integer +1/2 $j$, integer +1/2 $k$) 
    11541155points (see Table \autoref{tab:cell}) respectively. 
    1155 We follow \citep{Griffies_Bk04} and calculate the streamfunction at a given $uw$-point from 
     1156We follow \citep{griffies_bk04} and calculate the streamfunction at a given $uw$-point from 
    11561157the surrounding four triads according to: 
    11571158\[ 
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