/[MITgcm]/manual/s_getstarted/text/getting_started.tex

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-revision 1.11 by adcroft,
Tue Dec  4 18:08:34 2001 UTC
+revision 1.14 by edhill,
Wed Jul 30 13:42:52 2003 UTC
 Line 28 
 and site, as well as links for downloadi
  documentation, to data-sources and other related sites.
  There is also a support news group for the model that you can email at
- \texttt{support@mitgcm.org} or browse at:
+ \texttt{MITgcm-support@mitgcm.org} or browse at:
  \begin{verbatim}
  news://mitgcm.org/mitgcm.support
  \end{verbatim}
 Line 41 
 in the future.
  MITgcm can be downloaded from our system by following
  the instructions below. As a courtesy we ask that you send e-mail to us at
- \begin{rawhtml} <A href=mailto:support@mitgcm.org> \end{rawhtml}
+ \begin{rawhtml} <A href=mailto:MITgcm-support@mitgcm.org> \end{rawhtml}
- support@mitgcm.org
+ MITgcm-support@mitgcm.org
  \begin{rawhtml} </A> \end{rawhtml}
  to enable us to keep track of who's using the model and in what application.
  You can download the model two ways:
 Line 116 
 The tar file still contains CVS informat
  delete; even if you do not use CVS yourself the information can help
  us if you should need to send us your copy of the code.
+ \paragraph*{Upgrading from an earlier version}
+ If you already have an earlier version of the code you can ``upgrade''
+ your copy instead of downloading the entire repository again. First,
+ ``cd'' (change directory) to the top of your working copy:
+ \begin{verbatim}
+ % cd MITgcm
+ \end{verbatim}
+ and then issue the cvs update command:
+ \begin{verbatim}
+ % cvs -q update -r release1_beta1 -d -P
+ \end{verbatim}
+ This will update the ``tag'' to ``release1\_beta1'', add any new
+ directories (-d) and remove any empty directories (-P). The -q option
+ means be quiet which will reduce the number of messages you'll see in
+ the terminal. If you have modified the code prior to upgrading, CVS
+ will try to merge your changes with the upgrades. If there is a
+ conflict between your modifications and the upgrade, it will report
+ that file with a ``C'' in front, e.g.:
+ \begin{verbatim}
+ C model/src/ini_parms.F
+ \end{verbatim}
+ If the list of conflicts scrolled off the screen, you can re-issue the
+ cvs update command and it will report the conflicts. Conflicts are
+ indicated in the code by the delimites ``<<<<<<<'', ``======='' and
+ ``>>>>>>>''. For example,
+ \begin{verbatim}
+ <<<<<<< ini_parms.F
+      & bottomDragLinear,myOwnBottomDragCoefficient,
+ =======
+      & bottomDragLinear,bottomDragQuadratic,
+ >>>>>>> 1.18
+ \end{verbatim}
+ means that you added ``myOwnBottomDragCoefficient'' to a namelist at
+ the same time and place that we added ``bottomDragQuadratic''. You
+ need to resolve this conflict and in this case the line should be
+ changed to:
+ \begin{verbatim}
+      & bottomDragLinear,bottomDragQuadratic,myOwnBottomDragCoefficient,
+ \end{verbatim}
+ and the lines with the delimiters (<<<<<<,======,>>>>>>) be deleted.
+ Unless you are making modifications which exactly parallel
+ developments we make, these types of conflicts should be rare.
+ \paragraph*{Upgrading to the current pre-release version}
+ We don't make a ``release'' for every little patch and bug fix in
+ order to keep the frequency of upgrades to a minimum. However, if you
+ have run into a problem for which ``we have already fixed in the
+ latest code'' and we haven't made a ``tag'' or ``release'' since that
+ patch then you'll need to get the latest code:
+ \begin{verbatim}
+ % cvs -q update -A -d -P
+ \end{verbatim}
+ Unlike, the ``check-out'' and ``update'' procedures above, there is no
+ ``tag'' or release name. The -A tells CVS to upgrade to the
+ very latest version. As a rule, we don't recommend this since you
+ might upgrade while we are in the processes of checking in the code so
+ that you may only have part of a patch. Using this method of updating
+ also means we can't tell what version of the code you are working
+ with. So please be sure you understand what you're doing.
  \section{Model and directory structure}
- The ``numerical'' model is contained within a execution environment support
+ The ``numerical'' model is contained within a execution environment
- wrapper. This wrapper is designed to provide a general framework for
+ support wrapper. This wrapper is designed to provide a general
- grid-point models. MITgcmUV is a specific numerical model that uses the
+ framework for grid-point models. MITgcmUV is a specific numerical
- framework. Under this structure the model is split into execution
+ model that uses the framework. Under this structure the model is split
- environment support code and conventional numerical model code. The
+ into execution environment support code and conventional numerical
- execution environment support code is held under the \textit{eesupp}
+ model code. The execution environment support code is held under the
- directory. The grid point model code is held under the \textit{model}
+ \textit{eesupp} directory. The grid point model code is held under the
- directory. Code execution actually starts in the \textit{eesupp} routines
+ \textit{model} directory. Code execution actually starts in the
- and not in the \textit{model} routines. For this reason the top-level
+ \textit{eesupp} routines and not in the \textit{model} routines. For
+ this reason the top-level
  \textit{MAIN.F} is in the \textit{eesupp/src} directory. In general,
  end-users should not need to worry about this level. The top-level routine
  for the numerical part of the code is in \textit{model/src/THE\_MODEL\_MAIN.F%
-Line 267 
 calculation. Described in detail in sect
+Line 330 
 calculation. Described in detail in sect
  \item \textit{global\_ocean.90x40x15} Global circulation with
  GM, flux boundary conditions and poles.
+ \item \textit{global\_ocean\_pressure} Global circulation in pressure
+   coordinate (non-Boussinesq ocean model). Described in detail in
+   section \ref{sect:eg-globalpressure}.
  \item \textit{solid-body.cs-32x32x1} Solid body rotation test for cube sphere
  grid.
-Line 804 
 here I think. To come soon...)
+Line 871 
 here I think. To come soon...)
  \item time-discretization
  \end{itemize}
- The time steps are set through the real variables \textbf{deltaTMom }and
+ The time steps are set through the real variables \textbf{deltaTMom}
- \textbf{deltaTtracer }(in s) which represent the time step for the momentum
+ and \textbf{deltaTtracer} (in s) which represent the time step for the
- and tracer equations, respectively. For synchronous integrations, simply set
+ momentum and tracer equations, respectively. For synchronous
- the two variables to the same value (or you can prescribe one time step only
+ integrations, simply set the two variables to the same value (or you
- through the variable \textbf{deltaT}). The Adams-Bashforth stabilizing
+ can prescribe one time step only through the variable
- parameter is set through the variable \textbf{abEps }(dimensionless). The
+ \textbf{deltaT}). The Adams-Bashforth stabilizing parameter is set
- stagger baroclinic time stepping can be activated by setting the logical
+ through the variable \textbf{abEps} (dimensionless). The stagger
- variable \textbf{staggerTimeStep }to '.\texttt{TRUE}.'.
+ baroclinic time stepping can be activated by setting the logical
+ variable \textbf{staggerTimeStep} to '.\texttt{TRUE}.'.
  \subsection{Equation of state}
- First, because the model equations are written in terms of perturbations, a
+ First, because the model equations are written in terms of
- reference thermodynamic state needs to be specified. This is done through
+ perturbations, a reference thermodynamic state needs to be specified.
- the 1D arrays \textbf{tRef}\textit{\ }and \textbf{sRef}. \textbf{tRef }%
+ This is done through the 1D arrays \textbf{tRef} and \textbf{sRef}.
- specifies the reference potential temperature profile (in $^{o}$C for
+ \textbf{tRef} specifies the reference potential temperature profile
- the ocean and $^{o}$K for the atmosphere) starting from the level
+ (in $^{o}$C for the ocean and $^{o}$K for the atmosphere) starting
- k=1. Similarly, \textbf{sRef}\textit{\ }specifies the reference salinity
+ from the level k=1. Similarly, \textbf{sRef} specifies the reference
- profile (in ppt) for the ocean or the reference specific humidity profile
+ salinity profile (in ppt) for the ocean or the reference specific
- (in g/kg) for the atmosphere.
+ humidity profile (in g/kg) for the atmosphere.
- The form of the equation of state is controlled by the character variables
+ The form of the equation of state is controlled by the character
- \textbf{buoyancyRelation}\textit{\ }and \textbf{eosType}\textit{. }\textbf{%
+ variables \textbf{buoyancyRelation} and \textbf{eosType}.
- buoyancyRelation}\textit{\ }is set to '\texttt{OCEANIC}' by default and
+ \textbf{buoyancyRelation} is set to '\texttt{OCEANIC}' by default and
- needs to be set to '\texttt{ATMOSPHERIC}' for atmosphere simulations. In
+ needs to be set to '\texttt{ATMOSPHERIC}' for atmosphere simulations.
- this case, \textbf{eosType}\textit{\ }must be set to '\texttt{IDEALGAS}'.
+ In this case, \textbf{eosType} must be set to '\texttt{IDEALGAS}'.
- For the ocean, two forms of the equation of state are available: linear (set
+ For the ocean, two forms of the equation of state are available:
- \textbf{eosType}\textit{\ }to '\texttt{LINEAR}') and a polynomial
+ linear (set \textbf{eosType} to '\texttt{LINEAR}') and a polynomial
- approximation to the full nonlinear equation ( set \textbf{eosType}\textit{\
+ approximation to the full nonlinear equation ( set
- }to '\texttt{POLYNOMIAL}'). In the linear case, you need to specify the
+ \textbf{eosType}\textit{\ }to '\texttt{POLYNOMIAL}'). In the linear
- thermal and haline expansion coefficients represented by the variables
+ case, you need to specify the thermal and haline expansion
- \textbf{tAlpha}\textit{\ }(in K$^{-1}$) and \textbf{sBeta}\textit{\ }(in ppt$%
+ coefficients represented by the variables \textbf{tAlpha}\textit{\
- ^{-1}$). For the nonlinear case, you need to generate a file of polynomial
+   }(in K$^{-1}$) and \textbf{sBeta} (in ppt$^{-1}$). For the nonlinear
- coefficients called \textit{POLY3.COEFFS. }To do this, use the program
+ case, you need to generate a file of polynomial coefficients called
- \textit{utils/knudsen2/knudsen2.f }under the model tree (a Makefile is
+ \textit{POLY3.COEFFS}. To do this, use the program
- available in the same directory and you will need to edit the number and the
+ \textit{utils/knudsen2/knudsen2.f} under the model tree (a Makefile is
- values of the vertical levels in \textit{knudsen2.f }so that they match
+ available in the same directory and you will need to edit the number
- those of your configuration). \textit{\ }
+ and the values of the vertical levels in \textit{knudsen2.f} so that
+ they match those of your configuration).
+ There there are also higher polynomials for the equation of state:
+ \begin{description}
+ \item['\texttt{UNESCO}':] The UNESCO equation of state formula of
+   Fofonoff and Millard \cite{fofonoff83}. This equation of state
+   assumes in-situ temperature, which is not a model variable; \emph{its use
+   is therefore discouraged, and it is only listed for completeness}.
+ \item['\texttt{JMD95Z}':] A modified UNESCO formula by Jackett and
+   McDougall \cite{jackett95}, which uses the model variable potential
+   temperature as input. The '\texttt{Z}' indicates that this equation
+   of state uses a horizontally and temporally constant pressure
+   $p_{0}=-g\rho_{0}z$.
+ \item['\texttt{JMD95P}':] A modified UNESCO formula by Jackett and
+   McDougall \cite{jackett95}, which uses the model variable potential
+   temperature as input. The '\texttt{P}' indicates that this equation
+   of state uses the actual hydrostatic pressure of the last time
+   step. Lagging the pressure in this way requires an additional pickup
+   file for restarts.
+ \item['\texttt{MDJWF}':] The new, more accurate and less expensive
+   equation of state by McDougall et~al. \cite{mcdougall03}. It also
+   requires lagging the pressure and therefore an additional pickup
+   file for restarts.
+ \end{description}
+ For none of these options an reference profile of temperature or
+ salinity is required.
  \subsection{Momentum equations}
-Line 1073 
 fields can be written out by setting the
+Line 1167 
 fields can be written out by setting the
  The precision with which to write the binary data is controlled by the
  integer variable w\textbf{riteBinaryPrec }(set it to \texttt{32} or \texttt{%
 }).
+ %%% Local Variables:
+ %%% mode: latex
+ %%% TeX-master: t
+ %%% End:

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