There are now two diagnostics packages available. The first, and older, package
provides diagnostics of the climatological monthly means. The second package
provides some diagnostics of the variability.
Diagnostics of Variability
Dave Williamson's Draft of the WGNE Standard Diagnostics of Variability.
The variability package produces a limited number of plots on 6-hourly, daily,
and monthly timescales. The package produces a tar file of the html and image
files organized in a directory structure for easy viewing with the user's browser
To use this package certain fields must be output by the model.
Note that 6-hourly and daily data are not output by default.
The following fields are required:
6-Hourly: FLUT, U850, U200, OMEGA500, PRECT
Daily: U200, V200, PRECT
Monthly: the default fields are sufficient
The following lines must be present in your namelist file in order
to have the model output all of the necessary fields used by the
variability package. If you are not already using fincl2 or fincl3,
you may use these 'as is'. If you are, please concatenate these
fincl2 and fincl3 lists onto your own.
fincl2 = 'U200','V200','PRECT'
fincl3 = 'FLUT','OMEGA500','PRECT','U200','U850'
mfilt(3) = 40
nhtfrq(3) = -6
Plot Types Included
Wavenumber-frequency power spectra plots
Daily DataHovmöller plots of 200 mb velocity potential
Madden-Julian Oscillation index plots
Precipitation rate histograms
Monthly/Seasonal DataEquatorial Pacific Hovmöller plots of anomalies
Timeseries of surface temperature anomalies
Timeseries of Niño 1&2, Niño 3, Niño 4 anomalies
Timeseries of precipitation anomalies
Timeseries of total cloud amount anomalies
Timeseries of sea-level pressure anomalies
EOFs of winter 500 mb geopotential height
Amplitude and phase of annual cycle
Example plots of the webpages created by the variability diagnostics package.
Get the Script or Code
Users with NCAR accounts can download the c-shell script needed to
run the package. Alternatively, DAVE and Dataproc users can copy the script
/ccsm/atm/DIAG/var_code/variab.csh to their working directory, and CGD Linux
and SUN users can copy /fs/cgd/data0/stevens/DIAG/var_code/variab.csh to their
working directory. Then just execute the interactive script. The script will prompt
you for the needed path names, etc.
If you wish to install the package on your own system a tar file of the code
and the comparison plots is available on my anonymous ftp website (~12MB).
>login using "anonymous" and your email address
Untar the file where you wish. You will only need to edit the script
variab.csh to set the environment variable DIAG_HOME to point to the
directory you just created. Please read the README file.
Mark Stevens (email@example.com)
Climate and Global Dynamics Division
National Center for Atmospheric Research