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Changeset 2285 for branches/nemo_v3_3_beta/DOC/TexFiles/Chapters/Chap_TRA.tex – NEMO

Ignore:
Timestamp:
2010-10-17T17:08:15+02:00 (14 years ago)
Author:
gm
Message:

ticket:#658 suppression of key_zco + add math_abbrev.sty file + some minor correction

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1 edited

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  • branches/nemo_v3_3_beta/DOC/TexFiles/Chapters/Chap_TRA.tex

    r2282 r2285  
    4848In the present chapter we also describe the diagnostic equations used to compute  
    4949the sea-water properties (density, Brunt-Vais\"{a}l\"{a} frequency, specific heat and  
    50 freezing point with associated modules \mdl{eosbn2}, \mdl{ocfzpt} and \mdl{phycst}). 
     50freezing point with associated modules \mdl{eosbn2} and \mdl{phycst}). 
    5151 
    5252The different options available to the user are managed by namelist logicals or  
     
    7979\end{equation} 
    8080where $\tau$ is either T or S, and $b_t= e_{1t}\,e_{2t}\,e_{3t}$ is the volume of $T$-cells.  
    81 In pure $z$-coordinate (\key{zco} is defined), it reduces to : 
    82 \begin{equation} \label{Eq_tra_adv_zco} 
    83 ADV_\tau = - \frac{1}{e_{1t}\,e_{2t}} \left( \; \delta_i \left[ e_{2u} \;u \;\tau_u \right]  
    84                                                                  + \delta_j \left[ e_{1v} \;v \;\tau_v  \right] \; \right) 
    85                    -  \frac{1}{e_{3t}}                      \delta_k \left[             w \;\tau_w \right] 
    86 \end{equation} 
    87 since the vertical scale factors are functions of $k$ only, and thus  
    88 $e_{3u} =e_{3v} =e_{3t} $. The flux form in \eqref{Eq_tra_adv}  
     81The flux form in \eqref{Eq_tra_adv}  
    8982implicitly requires the use of the continuity equation. Indeed, it is obtained 
    9083by using the following equality : $\nabla \cdot \left( \vect{U}\,T \right)=\vect{U} \cdot \nabla T$  
    9184which results from the use of the continuity equation, $\nabla \cdot \vect{U}=0$ or  
    92 $\partial _t e_3 + e_3\;\nabla \cdot \vect{U}=0$ in constant volume (default option)  
    93 or variable volume (\key{vvl} defined) case, respectively.  
     85$ \partial _t e_3 + e_3\;\nabla \cdot \vect{U}=0$ in constant or variable volume case, respectively.  
    9486Therefore it is of paramount importance to design the discrete analogue of the  
    9587advection tendency so that it is consistent with the continuity equation in order to  
     
    481473It is therefore not recommended. 
    482474 
    483 Note that  
    484 (a) In the pure $z$-coordinate (\key{zco} is defined), $e_{3u}$=$e_{3v}$=$e_{3t}$,  
    485 so that the vertical scale factors disappear from (\ref{Eq_tra_ldf_lap}) ;  
    486 (b) In the partial step $z$-coordinate (\np{ln\_zps}=true), tracers in horizontally  
     475Note that in the partial step $z$-coordinate (\np{ln\_zps}=true), tracers in horizontally  
    487476adjacent cells are located at different depths in the vicinity of the bottom.  
    488477In this case, horizontal derivatives in (\ref{Eq_tra_ldf_lap}) at the bottom level  
     
    10961085structure in equilibrium with its physics.  
    10971086The choice of the shape of the Newtonian damping is controlled by two  
    1098 namelist parameters \np{??} and \np{nn\_zdmp}. The former allows us to specify: the  
     1087namelist parameters \np{nn\_hdmp} and \np{nn\_zdmp}. The former allows us to specify: the  
    10991088width of the equatorial band in which no damping is applied; a decrease  
    11001089in the vicinity of the coast; and a damping everywhere in the Red and Med Seas. 
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