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Changeset 8969 for branches/2017/dev_CNRS_2017/DOC/TexFiles/Chapters/Chap_DOM.tex – NEMO

Ignore:
Timestamp:
2017-12-11T09:28:41+01:00 (6 years ago)
Author:
flavoni
Message:

remove jphgr reference into DOC

File:
1 edited

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  • branches/2017/dev_CNRS_2017/DOC/TexFiles/Chapters/Chap_DOM.tex

    r8938 r8969  
    406406 
    407407 
    408 CAUTION! This part need to be rewritten! no jphgr\_mesh anymore  
    409  
    410 The user has three options available in defining a horizontal grid, which involve  
    411 the namelist variable \np{jphgr\_mesh} of the \ngn{namcfg} namelist.  
    412 \begin{description} 
    413 \item[\np{jphgr\_mesh}=0]  The most general curvilinear orthogonal grids. 
    414 The coordinates and their first derivatives with respect to $i$ and $j$ are provided 
    415 in a input file (\ifile{coordinates}), read in \rou{hgr\_read} subroutine of the domhgr module. 
    416 \item[\np{jphgr\_mesh}=1 to 5] A few simple analytical grids are provided (see below).  
    417 For other analytical grids, the \mdl{domhgr} module must be modified by the user.  
    418 \end{description} 
    419  
    420 There are two simple cases of geographical grids on the sphere. With  
    421 \np{jphgr\_mesh}=1, the grid (expressed in degrees) is regular in space,  
    422 with grid sizes specified by parameters \np{ppe1\_deg} and \np{ppe2\_deg},  
    423 respectively. Such a geographical grid can be very anisotropic at high latitudes  
    424 because of the convergence of meridians (the zonal scale factors $e_1$  
    425 become much smaller than the meridional scale factors $e_2$). The Mercator  
    426 grid (\np{jphgr\_mesh}=4) avoids this anisotropy by refining the meridional scale  
    427 factors in the same way as the zonal ones. In this case, meridional scale factors  
    428 and latitudes are calculated analytically using the formulae appropriate for  
    429 a Mercator projection, based on \np{ppe1\_deg} which is a reference grid spacing  
    430 at the equator (this applies even when the geographical equator is situated outside  
    431 the model domain).  
    432 %%% 
    433 \gmcomment{ give here the analytical expression of the Mercator mesh} 
    434 %%% 
    435 In these two cases (\np{jphgr\_mesh}=1 or 4), the grid position is defined by the  
    436 longitude and latitude of the south-westernmost point (\np{ppglamt0}  
    437 and \np{ppgphi0}). Note that for the Mercator grid the user need only provide  
    438 an approximate starting latitude: the real latitude will be recalculated analytically,  
    439 in order to ensure that the equator corresponds to line passing through $t$-  
    440 and $u$-points.   
    441  
    442 Rectangular grids ignoring the spherical geometry are defined with  
    443 \np{jphgr\_mesh} = 2, 3, 5. The domain is either an $f$-plane (\np{jphgr\_mesh} = 2,  
    444 Coriolis factor is constant) or a beta-plane (\np{jphgr\_mesh} = 3, the Coriolis factor  
    445 is linear in the $j$-direction). The grid size is uniform in meter in each direction,  
    446 and given by the parameters \np{ppe1\_m} and \np{ppe2\_m} respectively.  
    447 The zonal grid coordinate (\textit{glam} arrays) is in kilometers, starting at zero  
    448 with the first $t$-point. The meridional coordinate (gphi. arrays) is in kilometers,  
    449 and the second $t$-point corresponds to coordinate $gphit=0$. The input  
    450 variable \np{ppglam0} is ignored. \np{ppgphi0} is used to set the reference  
    451 latitude for computation of the Coriolis parameter. In the case of the beta plane,  
    452 \np{ppgphi0} corresponds to the center of the domain. Finally, the special case  
    453 \np{jphgr\_mesh}=5 corresponds to a beta plane in a rotated domain for the  
    454 GYRE configuration, representing a classical mid-latitude double gyre system.  
    455 The rotation allows us to maximize the jet length relative to the gyre areas  
    456 (and the number of grid points).  
    457  
    458 The choice of the grid must be consistent with the boundary conditions specified  
    459 by \np{jperio}, a parameter found in \ngn{namcfg} namelist (see {\S\ref{LBC}). 
    460  
    461408% ------------------------------------------------------------------------------------------------------------- 
    462409%        Grid files 
     
    646593(Fig.~\ref{Fig_zgr}). 
    647594 
    648 If the ice shelf cavities are opened (\np{ln\_isfcav}=~true~}), the definition of $z_0$ is the same.  
     595If the ice shelf cavities are opened (\np{ln\_isfcav}=~true~), the definition of $z_0$ is the same.  
    649596However, definition of $e_3^0$ at $t$- and $w$-points is respectively changed to: 
    650597\begin{equation} \label{DOM_zgr_ana} 
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