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US DOE Coupled Climate Model Data ArchivesSummaryThe Parallel Climate Model (PCM) and the Community Climate System Model (CCSM), both developed at the National Center for Atmospheric Research(NCAR), are fully-coupled, global climate models that provide state-of-the-art simulations of the Earth's past, present, and future climate states. These coupled general circulation models consist of submodels of the atmosphere, ocean, sea-ice and land linked by a central flux coupler.Data ArchivesOutput data from DOE supported climate models is freely available to the climate modeling community. Currently, there are two available methods to obtain these datasets. The complete dataset is stored on the NERSC HPSS tape system, archive.nersc.gov . A NERSC user account is required to access this data via the ftp or hsi file transfer utilities. A subset of these datasets is also offered on the Live Access Server, esg.llnl.gov/las. Access to this subset is controlled by a password. As the Earth System Grid project progresses, additional technologies will be exploited. Output results from the NCAR models, PCM and CCSM2.0 are currently available. PCM has been integrated under many different forcing configurations. Upwards of fifty different runs are available. Presently, only the control run from CCSM2.0 is available. However, the complete atmospheric and oceanic monthly datasets are available for years 350 through 999 as well as 290 years of atmospheric daily output. The data present in both of these archives has been postprocessed from the original output data. Each output variable has been extracted from the monthly history file (containing all variables for a single month or year) and written to a file containing only that variable for an extended subset of the integration time. This procedure reduces the amount of data required to construct a time series by a few orders of magnitude. Limited quality control procedures have also been applied with more QC under development. Data users are encouraged to report any problems. Users should also note that some CCSM2 data is served directly from NCAR, either via the internet or their mass storage system. More Information
Michael Wehner mfwehner@lbl.gov Registering to access PCM or CCSM2.0 archived dataTo access the DOE output data archives from the PCM and/or CCSM2.0, registration with NCAR is required. Ultimate permission to utilize this data is reserved by NCAR. Step 1. Complete the NCAR web form by following the links at http://www.ccsm.ucar.edu/experiments/ . Inspect the lists of data available at NCAR to see if your needs are fulfilled. If not, proceed to the next step. Step 2. Certain commonly accessed data is stored on the Live Access Server, http://esg.llnl.gov/las . This web interface to the data archive enables data browsing, plotting and downloading. It is especially useful for constructing subsets of a timeseries, limited either in the spatial or temporal dimensions. The PCM and CCSM2 data on this server are password protected. To get a password, fill out this form and email it to MFWehner@lbl.gov. You may browse the lists of available data without a password. If the data you are interested in is not contained on this server, or if the file sizes are very large (as is the case for variables containing height or depth dimensions), or if you need a lot of different variables from different experiments, you should get a NERSC storage account to access the tape directories by proceeding to the next step. Step 3. The complete PCM and CCSM2 datasets are stored on the HPSS tape directory at archive.nersc.gov. To get a NERSC account, fill out this form and email it to MFWehner@lbl.gov. Clear text password ftp is not allowed on this machine. Instructions for encrypted password ftp are available here. Alternatively, the routine hsi also allows fast data transfer. Further assistance on these procedures is available by emailing consult@nersc.gov or by dialing 1-800-66NERSC (select option 3).
File structure details in the DOE climate model data archiveMany different simulations and climate variables are available. The directory structure on archive.nersc.gov is arranged in the following manner: /nersc/mp193/mwehner/model/run_name/component_name/sampling_name/file_name
where:
The monthly file naming convention is variable_name_model_run_name_start_date_end_date.nc
where:
Currently available simulations in the DOE climate model data archiveCCSM2.0
PCM1.0
Idealized CO2 only forcings
PCM1.1
Ensemble of historical Greenhouse Gas + Sulfate aerosol (GS) forcings
Future Scenario forcings
B06.39 Business-as-usual 4a 2100-2199 B05.13 Stabilization
1 2005-2099
B06.20 IPCC scenario
A2 1981-2099
Historical GHG + SO4 + Ozone+ Solar Variability Ensemble
Historical GHG + SO4 + Ozone+ Solar Variability + Volcanoes
Ensemble
Historical Natural Forcings only (Solar + Volcanoes) Ensemble
Historical Solar Variability only Ensemble
Historical Volcanic Forcing only Ensemble
Natural + Ozone Forcing changes only Ensemble
Historical GHG + SO4 + Solar Variability + Volcanoes Ensemble (constant
ozone)
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