/[MITgcm]/manual/s_algorithm/text/shap.tex
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revision 1.3 by cnh, Thu Oct 25 18:36:53 2001 UTC revision 1.7 by jmc, Mon Aug 30 23:09:18 2010 UTC
# Line 2  Line 2 
2  % $Name$  % $Name$
3    
4  \section{Shapiro Filter}  \section{Shapiro Filter}
5    \label{sec:shapiro-filter}
6    
7  The Shapiro filter (Shapiro 1970, 1975) is a high order horizontal  The Shapiro filter \cite{Shapiro_70} is a high order horizontal
8  filter that efficiently remove small scale grid noise  filter that efficiently remove small scale grid noise
9  without affecting the physical structures of a field.  without affecting the physical structures of a field.
10  It is applied at the end of the time step %(the\_correction\_step),  It is applied at the end of the time step %(the\_correction\_step),
# Line 21  Alternatively, a pure computational filt Line 22  Alternatively, a pure computational filt
22  using pure numerical differences and ignoring  using pure numerical differences and ignoring
23  grid spacing.  grid spacing.
24  This later form is stable whatever the grid is, and therefore  This later form is stable whatever the grid is, and therefore
25  specially useful for highly anisotropic grid such as spherical  specially useful for highly anisotropic grid such as spherical
26  coordinate grid.  coordinate grid.
27  A damping time-scale parameter $\tau_{shap}$  A damping time-scale parameter $\tau_{shap}$
28  defines the strength of the filter damping.  defines the strength of the filter damping.
# Line 60  The stability of this S2g filter require Line 61  The stability of this S2g filter require
61  $L_{shap} < \mathrm{Min}^{(Global)}(\Delta x,\Delta y)$.  $L_{shap} < \mathrm{Min}^{(Global)}(\Delta x,\Delta y)$.
62    
63  \marginpar{Add Response functions and figures}  \marginpar{Add Response functions and figures}
64    
65    \subsection{SHAP Diagnostics}
66    \label{sec:pkg:shap_filt:diagnostics}
67    
68    \begin{verbatim}
69    
70    ------------------------------------------------------------------------
71    <-Name->|Levs|<-parsing code->|<--  Units   -->|<- Tile (max=80c)
72    ------------------------------------------------------------------------
73    SHAP_dT |  5 |SM      MR      |K/s             |Temperature Tendency due to Shapiro Filter
74    SHAP_dS |  5 |SM      MR      |g/kg/s          |Specific Humidity Tendency due to Shapiro Filter
75    SHAP_dU |  5 |UU   148MR      |m/s^2           |Zonal Wind Tendency due to Shapiro Filter
76    SHAP_dV |  5 |VV   147MR      |m/s^2           |Meridional Wind Tendency due to Shapiro Filter
77    \end{verbatim}
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