/[MITgcm]/manual/s_phys_pkgs/text/fizhi.tex
ViewVC logotype

Diff of /manual/s_phys_pkgs/text/fizhi.tex

Parent Directory Parent Directory | Revision Log Revision Log | View Revision Graph Revision Graph | View Patch Patch

revision 1.10 by molod, Tue Aug 2 15:43:59 2005 UTC revision 1.13 by molod, Wed Aug 3 17:55:20 2005 UTC
# Line 8  Line 8 
8  \subsubsection{Introduction}  \subsubsection{Introduction}
9  The fizhi (high-end atmospheric physics) package includes a collection of state-of-the-art  The fizhi (high-end atmospheric physics) package includes a collection of state-of-the-art
10  physical parameterizations for atmospheric radiation, cumulus convection, atmospheric  physical parameterizations for atmospheric radiation, cumulus convection, atmospheric
11  boundary layer turbulence, and land surface processes.  boundary layer turbulence, and land surface processes. The collection of atmospheric
12    physics parameterizations were originally used together as part of the GEOS-3
13    (Goddard Earth Observing System-3) GCM developed at the NASA/Goddard Global Modelling
14    and Assimilation Office (GMAO).
15    
16  % *************************************************************************  % *************************************************************************
17  % *************************************************************************  % *************************************************************************
# Line 166  RH_{min} & = & 0.75 \nonumber \\ Line 169  RH_{min} & = & 0.75 \nonumber \\
169    
170  These cloud fractions are suppressed, however, in regions where the convective  These cloud fractions are suppressed, however, in regions where the convective
171  sub-cloud layer is conditionally unstable.  The functional form of $RH_c$ is shown in  sub-cloud layer is conditionally unstable.  The functional form of $RH_c$ is shown in
172  Figure (\ref{fig:fizhi:rhcrit}).  Figure (\ref{fig.rhcrit}).
173    
174  \begin{figure*}[htbp]  \begin{figure*}[htbp]
175    \vspace{0.4in}    \vspace{0.4in}
176    \centerline{  \epsfysize=4.0in  \epsfbox{part6/rhcrit.ps}}    \centerline{  \epsfysize=4.0in  \epsfbox{part6/rhcrit.ps}}
177    \vspace{0.4in}    \vspace{0.4in}
178    \caption  [Critical Relative Humidity for Clouds.]    \caption  [Critical Relative Humidity for Clouds.]
179              {Critical Relative Humidity for Clouds.}              {Critical Relative Humidity for Clouds.}
180    \label{fig:fizhi:rhcrit}    \label{fig.rhcrit}
181  \end{figure*}  \end{figure*}
182    
183  The total cloud fraction in a grid box is determined by the larger of the two cloud fractions:  The total cloud fraction in a grid box is determined by the larger of the two cloud fractions:
# Line 305  cloud cover of all the layers in the gro Line 308  cloud cover of all the layers in the gro
308  of a given layer is then scaled for both the direct (as a function of the  of a given layer is then scaled for both the direct (as a function of the
309  solar zenith angle) and diffuse beam radiation  solar zenith angle) and diffuse beam radiation
310  so that the grouped layer reflectance is the same as the original reflectance.  so that the grouped layer reflectance is the same as the original reflectance.
311  The solar flux is computed for each of the eight cloud realizations possible  The solar flux is computed for each of eight cloud realizations possible within this
 (see Figure \ref{fig:fizhi:cloud}) within this  
312  low/middle/high classification, and appropriately averaged to produce the net solar flux.  low/middle/high classification, and appropriately averaged to produce the net solar flux.
313    
 \begin{figure*}[htbp]  
   \vspace{0.4in}  
   \centerline{  \epsfysize=4.0in  %\epsfbox{part6/rhcrit.ps}  
              }  
   \vspace{0.4in}  
   \caption  {Low-Middle-High Cloud Configurations}  
   \label{fig:fizhi:cloud}  
 \end{figure*}  
   
   
314  \paragraph{Longwave Radiation}  \paragraph{Longwave Radiation}
315    
316  The longwave radiation package used in the fizhi package is thoroughly described by \cite{chsz:94}.  The longwave radiation package used in the fizhi package is thoroughly described by \cite{chsz:94}.
# Line 357  Band & Spectral Range (cm$^{-1}$) & Abso Line 349  Band & Spectral Range (cm$^{-1}$) & Abso
349  \end{tabular}  \end{tabular}
350  \end{center}  \end{center}
351  \vspace{0.1in}  \vspace{0.1in}
352  \caption{IR Spectral Bands, Absorbers, and Parameterization Method (from \cite{chzs:94})}  \caption{IR Spectral Bands, Absorbers, and Parameterization Method (from \cite{chsz:94})}
353  \label{tab:fizhi:longwave}  \label{tab:fizhi:longwave}
354  \end{table}  \end{table}
355    
# Line 428  The cloud fraction values are time-avera Line 420  The cloud fraction values are time-avera
420  hours).  Therefore, in a time-averaged sense, both convective and large-scale  hours).  Therefore, in a time-averaged sense, both convective and large-scale
421  cloudiness can exist in a given grid-box.    cloudiness can exist in a given grid-box.  
422    
423  Turbulence:  \paragraph{Turbulence}:
424    
425  Turbulence is parameterized in the fizhi package to account for its contribution to the  Turbulence is parameterized in the fizhi package to account for its contribution to the
426  vertical exchange of heat, moisture, and momentum.    vertical exchange of heat, moisture, and momentum.  
# Line 683  are shown in Table \ref{tab:fizhi:surfty Line 675  are shown in Table \ref{tab:fizhi:surfty
675  cell occupied by any surface type were derived from the surface classification of  cell occupied by any surface type were derived from the surface classification of
676  \cite{deftow:94}, and information about the location of permanent  \cite{deftow:94}, and information about the location of permanent
677  ice was obtained from the classifications of \cite{dorsell:89}.  ice was obtained from the classifications of \cite{dorsell:89}.
678  The surface type for the \txt GCM grid is shown in Figure \ref{fig:fizhi:surftype}.  The surface type map for a $1^\circ$ grid is shown in Figure \ref{fig:fizhi:surftype}.
679  The determination of the land or sea category of surface type was made from NCAR's  The determination of the land or sea category of surface type was made from NCAR's
680  10 minute by 10 minute Navy topography  10 minute by 10 minute Navy topography
681  dataset, which includes information about the percentage of water-cover at any point.  dataset, which includes information about the percentage of water-cover at any point.
682  The data were averaged to the model's \fxf and \txt grid resolutions,  The data were averaged to the model's grid resolutions,
683  and any grid-box whose averaged water percentage was $\geq 60 \%$ was  and any grid-box whose averaged water percentage was $\geq 60 \%$ was
684  defined as a water point. The \fxf grid Land-Water designation was further modified  defined as a water point. The Land-Water designation was further modified
685  subjectively to ensure sufficient representation from small but isolated land and water regions.  subjectively to ensure sufficient representation from small but isolated land and water regions.
686    
687  \begin{table}  \begin{table}
# Line 720  and surface albedo.} Line 712  and surface albedo.}
712    
713    
714  \begin{figure*}[htbp]  \begin{figure*}[htbp]
715    \centerline{  \epsfysize=7in  \epsfbox{part6/surftypes.ps}}    \begin{center}
716    \vspace{0.3in}    \rotatebox{270}{\resizebox{90mm}{!}{\includegraphics{part6/surftypes.eps}}}
717    \caption  {Surface Type Compinations at \txt resolution.}    \rotatebox{270}{\resizebox{100mm}{!}{\includegraphics{part6/surftypes.descrip.eps}}}
718      \end{center}
719      \vspace{0.2in}
720      \caption  {Surface Type Combinations at $1^\circ$ resolution.}
721    \label{fig:fizhi:surftype}    \label{fig:fizhi:surftype}
722  \end{figure*}  \end{figure*}
723    
724  \begin{figure*}[htbp]  % \rotatebox{270}{\centerline{  \epsfysize=4in  \epsfbox{part6/surftypes.eps}}}
725    \centerline{  \epsfysize=7in  \epsfbox{part6/surftypes.descrip.ps}}  % \rotatebox{270}{\centerline{  \epsfysize=4in  \epsfbox{part6/surftypes.descrip.eps}}}
726    \vspace{0.3in}  %\begin{figure*}[htbp]
727    \caption  {Surface Type Descriptions.}  %  \centerline{  \epsfysize=4in  \epsfbox{part6/surftypes.descrip.ps}}
728    \label{fig:fizhi:surftype.desc}  %  \vspace{0.3in}
729  \end{figure*}  %  \caption  {Surface Type Descriptions.}
730    %  \label{fig:fizhi:surftype.desc}
731    %\end{figure*}
732    
733    
734  \paragraph{Surface Roughness}  \paragraph{Surface Roughness}
# Line 751  sun), the greenness fraction, the vegeta Line 748  sun), the greenness fraction, the vegeta
748  Modifications are made to account for the presence of snow, and its depth relative  Modifications are made to account for the presence of snow, and its depth relative
749  to the height of the vegetation elements.  to the height of the vegetation elements.
750    
751  Gravity Wave Drag:  \paragraph{Gravity Wave Drag}:
752    
753  The fizhi package employs the gravity wave drag scheme of \cite{zhouetal:96}).  The fizhi package employs the gravity wave drag scheme of \cite{zhouetal:95}).
754  This scheme is a modified version of Vernekar et al. (1992),  This scheme is a modified version of Vernekar et al. (1992),
755  which was based on Alpert et al. (1988) and Helfand et al. (1987).    which was based on Alpert et al. (1988) and Helfand et al. (1987).  
756  In this version, the gravity wave stress at the surface is  In this version, the gravity wave stress at the surface is
# Line 794  fields include:  sea surface temperature Line 791  fields include:  sea surface temperature
791  vegetation index, and the radiation-related background levels of: ozone, carbon dioxide,  vegetation index, and the radiation-related background levels of: ozone, carbon dioxide,
792  and stratospheric moisture.  and stratospheric moisture.
793    
794  Boundary condition data sets are available at the model's \fxf and \txt  Boundary condition data sets are available at the model's
795  resolutions for either climatological or yearly varying conditions.  resolutions for either climatological or yearly varying conditions.
796  Any frequency of boundary condition data can be used in the fizhi package;  Any frequency of boundary condition data can be used in the fizhi package;
797  however, the current selection of data is summarized in Table \ref{tab:fizhi:bcdata}\@.  however, the current selection of data is summarized in Table \ref{tab:fizhi:bcdata}\@.
798  The time mean values are interpolated during each model timestep to the  The time mean values are interpolated during each model timestep to the
799  current time. Future model versions will incorporate boundary conditions at  current time.
 higher spatial \mbox{($1^\circ$ x $1^\circ$)} resolutions.  
800    
801  \begin{table}[htb]  \begin{table}[htb]
802  \begin{center}  \begin{center}
Legend:
Removed from v.1.10  
changed lines
  Added in v.1.13
  ViewVC Help
Powered by ViewVC 1.1.22