/[MITgcm]/manual/s_examples/held_suarez_cs/inp_data.shap.templ
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revision 1.3 by jmc, Mon Aug 22 20:46:12 2005 UTC revision 1.4 by jmc, Mon Sep 26 01:11:50 2005 UTC
# Line 19  to use, here S2 in this experiment Line 19  to use, here S2 in this experiment
19    
20  \item Lines PUT_LINE_NB:nShapT= and PUT_LINE_NB:nShapUV=,  \item Lines PUT_LINE_NB:nShapT= and PUT_LINE_NB:nShapUV=,
21  \begin{verbatim}  \begin{verbatim}
22   nShapT=4,   nShapT=0,
23   nShapUV=4,   nShapUV=4,
24  \end{verbatim}  \end{verbatim}
25  Those lines select the order of the shapiro filter  Those lines select the order of the shapiro filter
26  for active tracer ($\theta$ and $q$) and momentum ($u,v$) respectively.  for active tracer ($\theta$ and $q$) and momentum ($u,v$) respectively.
27  This sets the integer parameter $n$ to 4, in the equations of  In this case, no filter is applied to active tracers. Regarding
28    the momentum, this sets the integer parameter $n$ to 4, in the equations of
29  section \ref{sect:shapiro-filter}, which corresponds to a 8th order  section \ref{sect:shapiro-filter}, which corresponds to a 8th order
30  filter.  filter.
31    
32  \item Lines PUT_LINE_NB:nShapTrPhys= and PUT_LINE_NB:nShapUVPhys=,  \item Line PUT_LINE_NB:nShapUVPhys=,
33  \begin{verbatim}  \begin{verbatim}
34   nShapTrPhys=0,   nShapUVPhys=4,
  nShapUVPhys=0,  
35  \end{verbatim}  \end{verbatim}
36  Those lines select the order of the physical space filter  This line selects the order of the physical space filter
37  (filter function S2g, in section \ref{sect:shapiro-filter})  (filter function S2g, in section \ref{sect:shapiro-filter})
38  that applies to $\theta,q$ and to $u,v$ respectively.  that applies to $u,v$.
39  The differences {\it nShapT - nShapTrPhys} and {\it nShapUV - nShapUVPhys}  The difference {\it nShapUV - nShapUVPhys}
40  correspond to the order of the computational filter  corresponds to the order of the computational filter
41  (filter function S2c, in section \ref{sect:shapiro-filter}).  (filter function S2c, in section \ref{sect:shapiro-filter}).
42    
43  \item Lines PUT_LINE_NB:Shap_Trtau= and PUT_LINE_NB:Shap_uvtau=,  \item Lines PUT_LINE_NB:#Shap_Trtau= and PUT_LINE_NB:#Shap_uvtau=,
44  \begin{verbatim}  \begin{verbatim}
45   Shap_Trtau=5400.,  #Shap_Trtau=5400.,
46   Shap_uvtau=1800.,  #Shap_uvtau=1800.,
47  \end{verbatim}  \end{verbatim}
48  Thoses lines set the time scale of the filter (in seconds),  Those commented lines would have set the time scale of the filter (in seconds),
49  for $\theta$ and $q$ and for $u$ and $v$ respectively,  for $\theta$ and $q$ and for $u$ and $v$ respectively,
50  to 5400 s (90 min) and 1800 s (30 min) respectively.  to 5400 s (90 min) and 1800 s (30 min) respectively.
51  Note that a shorter time scale means a stronger filter, and  Without explicitly setting those timescales, the default is used
52  that the time scale cannot be smaller than the time-step $\Delta t$  which corresponds to the model time-step.
53  of the model.  %Note that a shorter time scale means a stronger filter, and
54    %that the time scale cannot be smaller than the time-step $\Delta t$
55    %of the model.
56    
57  \end{itemize}  \end{itemize}
58    
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