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% $Header: /u/gcmpack/manual/s_examples/global_oce_latlon/inp_data.templ,v 1.4 2011/05/08 15:17:07 jmc Exp $ |
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% $Name: $ |
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|
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%\subsubsection{File {\it input/data}} |
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%\label{www:tutorials} |
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|
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This file, reproduced completely below, specifies the main parameters |
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for the experiment. The parameters that are significant for this configuration |
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are |
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|
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\begin{itemize} |
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|
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\item Lines PUT_LINE_NB:tRef=--PUT_LINE_NB:sRef= |
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\begin{verbatim} |
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tRef= 15*20., |
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sRef= 15*35., |
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\end{verbatim} |
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%$\cdots$ |
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%\\ |
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set reference values for potential |
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temperature and salinity at each model level in units of $^{\circ}\mathrm{C}$ and |
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${\rm ppt}$. The entries are ordered from surface to depth. |
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Density is calculated from anomalies at each level evaluated |
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with respect to the reference values set here.\\ |
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R INI\_THETA}({\it ini\_theta.F}) \\ |
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{\it S/R INI\_SALT}({\it ini\_salt.F}) |
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\end{minipage} |
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} |
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|
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\item Line PUT_LINE_NB:viscAr=, |
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\begin{verbatim} |
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viscAr=1.E-3, |
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\end{verbatim} |
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this line sets the vertical Laplacian dissipation coefficient to |
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$1 \times 10^{-3} {\rm m^{2}s^{-1}}$. Boundary conditions |
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for this operator are specified later. |
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|
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R CALC\_DIFFUSIVITY}({\it calc\_diffusivity.F}) |
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\end{minipage} |
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} |
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|
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\item Line PUT_LINE_NB:viscAh=, |
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\begin{verbatim} |
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viscAh=5.E5, |
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\end{verbatim} |
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this line sets the horizontal Laplacian frictional dissipation coefficient to |
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$5 \times 10^{5} {\rm m^{2}s^{-1}}$. Boundary conditions |
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for this operator are specified later. |
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|
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\item Lines PUT_LINE_NB:diffKhT= and PUT_LINE_NB:diffKhS=, |
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\begin{verbatim} |
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diffKhT=0., |
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diffKhS=0., |
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\end{verbatim} |
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set the horizontal diffusion coefficient for temperature and salinity |
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to 0, since package GMREDI is used. |
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|
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\item Lines PUT_LINE_NB:diffKrT= and PUT_LINE_NB:diffKrS=, |
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\begin{verbatim} |
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diffKrT=3.E-5, |
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diffKrS=3.E-5, |
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\end{verbatim} |
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set the vertical diffusion coefficient for temperature and salinity |
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to $3 \times 10^{-5}\,{\rm m^{2}s^{-1}}$. The boundary |
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condition on this operator is $\frac{\partial}{\partial z}=0$ at both |
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the upper and lower boundaries. |
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|
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\item Lines PUT_LINE_NB:rhonil=--PUT_LINE_NB:eosType= |
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\begin{verbatim} |
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rhonil=1035., |
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rhoConstFresh=1000., |
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eosType = 'JMD95Z', |
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\end{verbatim} |
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set the reference densities for sea water and fresh water, and selects |
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the equation of state \citep{jackett95} |
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R FIND\_RHO}~({\it find\_rho.F})\\ |
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{\it S/R FIND\_ALPHA}~({\it find\_alpha.F}) \\ |
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{\it S/R CALC\_PHI\_HYD}~({\it calc\_phi\_hyd.F})\\ |
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{\it S/R INI\_CG2D}~({\it ini\_cg2d.F})\\ |
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{\it S/R INI\_CG3D}~({\it ini\_cg3d.F})\\ |
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{\it S/R INI\_PARMS}~({\it ini\_parms.F})\\ |
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{\it S/R SOLVE\_FOR\_PRESSURE}~({\it solve\_for\_pressure.F}) |
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\end{minipage} |
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} |
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|
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|
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\item Lines PUT_LINE_NB:ivdc_kappa=--PUT_LINE_NB:implicitDiffusion=, |
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\begin{verbatim} |
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ivdc_kappa=100., |
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implicitDiffusion=.TRUE., |
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\end{verbatim} |
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specify an ``implicit diffusion'' scheme with increased vertical |
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diffusivity of 100~m$^2$/s in case of instable stratification. |
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\fbox{ |
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\begin{minipage}{5.0in} |
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\end{minipage} |
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} |
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|
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\item \ldots |
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|
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\item Line PUT_LINE_NB:readBinaryPrec=, |
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\begin{verbatim} |
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readBinaryPrec=32, |
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\end{verbatim} |
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Sets format for reading binary input datasets holding model fields to |
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use 32-bit representation for floating-point numbers.\\ |
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R READ\_WRITE\_FLD}~({\it read\_write\_fld.F})\\ |
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{\it S/R READ\_WRITE\_REC}~({\it read\_write\_rec.F}) |
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\end{minipage} |
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} |
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|
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\item Line PUT_LINE_NB:cg2dMaxIters=, |
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\begin{verbatim} |
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cg2dMaxIters=500, |
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\end{verbatim} |
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Sets maximum number of iterations the two-dimensional, conjugate |
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gradient solver will use, {\bf irrespective of convergence |
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criteria being met}.\\ |
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R CG2D}~({\it cg2d.F}) |
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\end{minipage} |
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} |
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|
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\item Line PUT_LINE_NB:cg2dTargetResidual=, |
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\begin{verbatim} |
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cg2dTargetResidual=1.E-13, |
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\end{verbatim} |
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Sets the tolerance which the two-dimensional, conjugate |
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gradient solver will use to test for convergence in equation |
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%- note: Description of Conjugate gradient method (& related params) is missing |
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% in the mean time, substitute this eq ref: |
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\ref{eq:elliptic-backward-free-surface} %\ref{eq:congrad_2d_resid} |
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to $1 \times 10^{-13}$. |
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Solver will iterate until tolerance falls below this value or until the |
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maximum number of solver iterations is reached.\\ |
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R CG2D}~({\it cg2d.F}) |
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\end{minipage} |
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} |
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|
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\item Line PUT_LINE_NB:nIter0=, |
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\begin{verbatim} |
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nIter0=0, |
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\end{verbatim} |
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Sets the starting time for the model internal time counter. |
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When set to non-zero this option implicitly requests a |
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checkpoint file be read for initial state. |
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By default the checkpoint file is named according to |
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the integer number of time step value \verb+nIter0+. |
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The internal time counter works in seconds. Alternatively, |
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\verb+startTime+ can be set. |
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|
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\item Line PUT_LINE_NB:nTimeSteps=, |
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\begin{verbatim} |
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nTimeSteps=20, |
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\end{verbatim} |
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Sets the time step number at which this simulation will terminate. |
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At the end of a simulation a checkpoint file is automatically |
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written so that a numerical experiment can consist of multiple |
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stages. Alternatively \verb+endTime+ can be set. |
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|
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\item Line PUT_LINE_NB:deltaTmom=, |
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\begin{verbatim} |
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deltaTmom=1800., |
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\end{verbatim} |
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Sets the timestep $\Delta t_{v}$ used in the momentum equations to |
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$30~{\rm mins}$. |
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%- note: Distord Physics (using different time-steps) is not described |
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% in the mean time, put this section ref: |
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See section \ref{sec:time_stepping}. %\ref{sec:mom_time_stepping}. |
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|
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R TIMESTEP}({\it timestep.F}) |
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\end{minipage} |
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} |
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|
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\item Line PUT_LINE_NB:tauCD=, |
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\begin{verbatim} |
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tauCD=321428., |
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\end{verbatim} |
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Sets the D-grid to C-grid coupling time scale $\tau_{CD}$ |
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used in the momentum equations. |
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%- note: description of CD-scheme pkg (and related params) is missing; |
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% in the mean time, comment out this ref. |
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%See section \ref{sec:cd_scheme}. |
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|
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R INI\_PARMS}({\it ini\_parms.F})\\ |
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{\it S/R MOM\_FLUXFORM}({\it mom\_fluxform.F}) |
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\end{minipage} |
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} |
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|
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\item Lines PUT_LINE_NB:deltaTtracer=--PUT_LINE_NB:deltaTfreesurf=, |
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\begin{verbatim} |
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deltaTtracer=86400., |
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deltaTClock = 86400., |
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deltaTfreesurf= 86400., |
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\end{verbatim} |
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Sets the default timestep, $\Delta t_{\theta}$, for tracer equations |
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and implicit free surface equations to |
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$24~{\rm hours}$. |
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% - note: Distord Physics (using different time-steps) is not |
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% described in the mean time, put this section ref: |
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See section \ref{sec:time_stepping}. %\ref{sec:tracer_time_stepping}. |
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|
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\fbox{ |
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\begin{minipage}{5.0in} |
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{\it S/R TIMESTEP\_TRACER}({\it timestep\_tracer.F}) |
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\end{minipage} |
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} |
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|
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\item Line PUT_LINE_NB:bathyFile=, |
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\begin{verbatim} |
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bathyFile='bathymetry.bin' |
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\end{verbatim} |
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This line specifies the name of the file from which the domain |
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bathymetry is read. This file is a two-dimensional ($x,y$) map of |
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depths. This file is assumed to contain 32-bit binary numbers |
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giving the depth of the model at each grid cell, ordered with the x |
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coordinate varying fastest. The points are ordered from low coordinate |
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to high coordinate for both axes. The units and orientation of the |
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depths in this file are the same as used in the MITgcm code. In this |
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experiment, a depth of $0m$ indicates a solid wall and a depth |
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of $<0m$ indicates open ocean. |
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|
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|
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\item Lines PUT_LINE_NB:zonalWindFile=--PUT_LINE_NB:meridWindFile=, |
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\begin{verbatim} |
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zonalWindFile='trenberth_taux.bin' |
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meridWindFile='trenberth_tauy.bin' |
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\end{verbatim} |
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These lines specify the names of the files from which the x- and y- |
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direction surface wind stress is read. These files are also |
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three-dimensional ($x,y,time$) maps and are enumerated and formatted |
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in the same manner as the bathymetry file. |
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\end{itemize} |
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|
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\noindent other lines in the file {\it input/data} are standard values |
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that are described in the MITgcm Getting Started and MITgcm Parameters |
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notes. |
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|
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\begin{small} |
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\input{s_examples/global_oce_latlon/input/data} |
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\end{small} |