- General
- Research
- Resources
- Historical
|
|
| Contact: | Kevin Raeder |
| Revision: | $Revision: 3102 $ |
| Source: | $URL: http://subversion.ucar.edu/DAReS/DART/trunk/doc/html/cgd_cam.shtml $ |
| Change Date: | $Date: 2007-09-12 09:27:55 -0600 (Wed, 12 Sep 2007) $ |
| Change history: | try "svn log" or "svn diff" |
DAReS has successfully incorporated CAM --
The Community Atmosphere Model -- into the DART framework.
It is being actively used by graduate students, post-graduates, and scientists
at universities and research labs. Others are only using analyses for their time
period and resolution of interest, produced here at NCAR using DART-CAM.
In addition to the standard DART features described elsewhere, current capabilities
(Jamaica-release) include the abilities to:
- Use either the Eulerian or finite-volume core.
- Use any resolution of CAM without recompiling DART.
The standard resolutions of T21, T42, T85,
FV 2x2.5 and 4x5 have been tested.
- Assimilate a variety of observations; to date the observations
successfully assimilated include the NCEP reanalysis BUFR obs
(T,U,V), Global Positioning System radio occultation obs, and
MOPITT carbon monoxide (when a chemistry model is incorporated
into FV CAM). Research is under way to assimilate surface
observations, specific humidity, cloud liquid water, and aerosols.
- Specify, via namelist entries, the CAM (initial file) variables
which will be directly affected by the observations. This allows
users to change the model state without recompiling.
- Generate analyses on the CAM grid which are of comparable quality
to those produced by operational centers, but which have only CAM
model error in them, rather than the model error of the models
used at the centers.
- Generate such analyses with as few as 20 ensemble members.
In addition to the standard DART package there is a collection
of initial condition files at the large file website
http://www.image.ucar.edu/pub/DART/CAM
that are helpful for interfacing CAM with DART. More information
and instructions for setting up assimilation experiments are
available in the DART/models/cam/model_mod.html
documentation and links.
Sample sets of observations, which can be used with DART-CAM
assimilations, can be found at
http://www.image.ucar.edu/pub/DART/Obs_sets/
of which the
NCEP BUFR observations
are the most widely used. More information and instructions for
setting up assimilation experiments are available in the
DART/models/cam/model_mod.html documentation and links.
Experience on a variety of machines has shown that it is a very good idea
to make sure your run-time environment has the following:
limit stacksize unlimited
limit datasize unlimited
|
