CCSM2.0.1 Public Release
Documentation, Source Code, and Input Data
This web page deals specifically with the coupled CCSM2.0.1 model release. At the bottom of the page are links to web pages for stand-alone versions of the Community Atmosphere Model (CAM) and Community Land Model (CLM).
The CCSM2.0.1 model release provides an incremental improvement over the CCSM2.0 release. A number of minor problems have been fixed, forcing datasets have been updated, and a lower-resolution paleo version (T31/gx3v4) of the model is now included. The baseline control run (T42/gx1v3) for CCSM2.0.1 is bit-for-bit exact compared to the CCSM2.0 control run. It is recommended that users take advantage of these improvements and use CCSM2.0.1 instead of CCSM2.0.
Model Documentation
Following are links to CCSM2.0.1 documentation including home pages for the various component models that are part of this official release.
The Complete Coupled System
- CCSM2.0.1 General Documentation
- Updates relative to CCSM2.0
- Frequently Asked Questions
- Shared Constants Module
- Problem/Bug reports
- Slide presentations from the script tutorial given June 2002 at NCAR.
Atmosphere Models
- Community Atmosphere Model (cam2)
- Climatological Data Model (datm5)
- Observational Data Model (latm5)
Ice Models
- CCSM Sea Ice Model (csim4)
- Climatological Data Model (dice5)
Land Models
- CCSM Land Model (clm2)
- Climatological Data Model (dlnd5)
Ocean Models
- CCSM Ocean Model (pop)
- Climatological Data Model (docn5)
Coupler
- The Coupler (cpl5)
Model Source Code
Download the CCSM2.0.1 source code tar ball -- a gzipped tar file. Once uncompressed, the tar file is 17Mb. To get the source code,
- Download the tar file above
- unzip using the command "gunzip ccsm2.0.1.tar.gz"
- Untar using the command "tar -xvf ccsm2.0.1.tar"
Linux Version
The University of Bern has ported CCSM2.0.1 to a Linux cluster, and have graciously offered to serve that version to the community. Please go to www.climate.unibe.ch/CCSM for the Linux version. Thanks to the University of Bern, Climate and Environment Physics Group for their help and support.
Patches
Download and untar these tar files in the same directory as ccsm2.0.1. These bugs are reported on the Problem/Bug reports page. These patches correct minor bugs in the release code, and they will change the answers slightly compared to the B20.007 control run.>
- Patch 1 download. This is a bug fix in the ocean model to correct hmix_gm.F.
- Patch 2 download. This is a bug fix in the coupler to correct a very minor error in communication of the ocean tilt fields to the ice model.
- Patch 3 download. This fixes the exact restart problem on seaborg.nersc.gov by replacing the massvp3 library on seaborg with the default massv version.
- Patch 4 download. Patch 3 plus updates to scripts and build for bluesky. Also, the compiler defaults for IBM machines (in Macros.AIX) has be changed from O3 to O2 due to problems in new IBM compilers. Performance is literally unchanged due to the O2 degradation in compiler optimization.
Model Input Data
| T31/gx3v4 input datasets tar file | 333066240 Bytes md5sum checksum of tar file (68 bytes) text listing of tar file contents |
| T42/gx1v3 input datasets tar file | 1045227520 Bytes md5sum checksum of tar file (68 bytes) text listing of tar file contents |
| T62 input datasets tar file (optional) | 1065103360 Bytes md5sum checksum of tar file (62 bytes) text listing of tar file contents |
| CLM surface generation datasets tar file (optional) | 1029488640 Bytes md5sum checksum of tar file (80 bytes) text listing of tar file contents |
Notes
- Confirm the integrity of the downloaded files after you download them! We have received reports of some browsers downloading partial files without issuing any warnings.
- Download the appropriate md5sum file and do a checksum verification (example: md5sum -c ccsm2.0.1.inputdata.T31_gx3v4.tar.md5sum )
- Compare the published filesizes with the actual size of your downloaded files.
- The T62 input datasets are only required for T62 latm configured runs (in addition to the T42_gx1v3 dataset).
- The CLM surface datasets correspond to high resolution datasets that are optional and are only needed if a surface dataset is to be generated at model run time. If a CLM surface dataset is generated at run time, only arbitrary initialization can be used for CLM initial data. See the land model documentation for more information.
- Use the command tar -xvf ccsm2.0.1.inputdata.RES_INDP.tar to untar each file. An "inputdata/" directory structure will be created below the current working directory containing the input datasets for each CCSM component. Use the full pathname of the inputdata/ directory as the CSMDATA variable in the CCSM run scripts or the GUI.
Model Output Data
This release is bit-for-bit exact compared to the CCSM2.0 model release for the control run. See the Experiments and Data section of the website for CCSM model output including the CCSM2.0 multi-century control run.
Known Problems and a review of Updates from CCSM2.0
- Known Bugs List: A list of documented problems will be updated here on a regular basis.
- Updates from CCSM2.0: A list of updates in CCSM2.0.1 compared to CCSM2.0
CAM/CLM Release Web Pages
CAM (Community Atmosphere Model) and CLM (Community Land Model) are available as individual stand-alone versions. These can be downloaded from the sites below. Note that the CAM distribution includes the CLM as part of it's distribution as stand-alone CAM operation uses the CLM for land surface forcing.
More Information
To subscribe to the ccsm-users mailing list follow the link, or email your request to ccsm @ ucar.edu. These are low volume mailing lists that allow the community to stay up to date with new releases, important bugs, and development procedures. Or if you have any problems or additional questions, please email ccsm @ ucar.edu. If you'd like to report a bug, email ccsm @ ucar.edu. Finally, feel free to provide us with feedback at ccsm @ ucar.edu about anything related to the CCSM documentation, source code, or release process.