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revision 1.2 by edhill, Tue Oct 12 18:16:03 2004 UTC revision 1.4 by molod, Mon Jul 18 20:45:27 2005 UTC
# Line 1  Line 1 
1  \section{Gridalt - Alternate Grid Package}  \subsection{Gridalt - Alternate Grid Package}
2  \label{sec:pkg:gridalt}  \label{sec:pkg:gridalt}
3  \begin{rawhtml}  \begin{rawhtml}
4  <!-- CMIREDIR:package_gridalt: -->  <!-- CMIREDIR:package_gridalt: -->
5  \end{rawhtml}  \end{rawhtml}
6    
7  \subsection {Introduction}  \subsubsection {Introduction}
 To take advantage of a `high end' turbulence parameterization  
 (and convection parameterization), the vertical resolution near the surface  
 must be increased substantially as compared to the vertical resolution needed  
 aloft. This cannot be accomplished if the high end physics is computed using  
 the $p^*$ coordinate currently in use in the MIT gcm.  
8    
9  The gridalt package was developed to allow the high end atmospheric physics  The gridalt package was developed to allow the high end atmospheric physics
10  (fizhi) physics to be run on a separate grid from the hydrodynamics. The package  (fizhi) physics to be run on a separate grid from the hydrodynamics. The package
# Line 23  levels. This is illustrated as follows: Line 18  levels. This is illustrated as follows:
18  \begin{figure}[htbp]  \begin{figure}[htbp]
19  \vspace*{-0.4in}  \vspace*{-0.4in}
20  \begin{center}  \begin{center}
21  \includegraphics[height=2.4in]{vertical.eps}  \includegraphics[height=2.4in]{part6/vertical.eps}
22  \end{center}  \end{center}
23  \end{figure}  \end{figure}
24    
# Line 55  The last term on the RHS is a relaxation Line 50  The last term on the RHS is a relaxation
50  the state variables on the modified vertical grid to `track' the  the state variables on the modified vertical grid to `track' the
51  state variables on the $p^*$ grid on some time scale, $\gamma$.  state variables on the $p^*$ grid on some time scale, $\gamma$.
52    
53  \subsection {Key subroutines, parameters and files }  \subsubsection {Key subroutines, parameters and files }
54    
55  \subsection {Dos and donts}  \subsubsection {Dos and donts}
56    
57  In the context of a Held-Suarez type of model experiment (located  In the context of a Held-Suarez type of model experiment (located
58  in the fizhi-hs.cs-32x32x10 verification experiment) with  in the fizhi-gridalt-hs verification experiment) with
59  topography, the forcing terms which represent the physics are computed on  topography, the forcing terms which represent the physics are computed on
60  the modified grid. The forcing terms are computed as functions of the  the modified grid. The forcing terms are computed as functions of the
61  state variables on the modified grid. The tendencies are then interpolated  state variables on the modified grid. The tendencies are then interpolated
62  to the standard grid  to the standard grid
63    
64  \subsection {Gridalt Reference}  \subsubsection {Gridalt Reference}
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