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An Ensemble of Atmospheric Forcing Files from a CAM reanalysis

| DOI: 10.5065/38ED-RZ08

This dataset contains files that are an ensemble of 'coupler history' files from an 80-member reanalysis performed with the Data Assimilation Research Testbed (DART) using the Community Atmosphere Model Version 4 with the finite volume core (CAM4 FV) at 1.9 degree by 2.5 degree resolution. The observations assimilated include all those used in the NCEP/NCAR reanalysis (temperature and wind components from radiosondes, aircraft, and satellite drift winds) plus radio occultation observations from the COSMIC satellites starting in late 2006. These files are intended to be used as 'DATM stream files' for CESM "I" component sets (land-only) that require a data atmosphere. Some example stream text files are included to illustrate how to use these data.

Note: All data were replaced for this dataset on January 27, 2020. There were some unphysical radiation values in the prior version of the dataset that has been fixed in the replacement file set. The unphysical radiation values caused CLM to error out but were likely not an issue for other applications.


The computational resources required to create this data set on NCAR's Bluefire computer and Mass Store system were provided by CISL under the CSL program. The award was named "Ensemble Data Assimilation For Climate Model Development".

Temporal Range:
1997-12-01 06:00:00 to 2010-12-31 18:00:00
Air Temperature Geopotential Height Longwave Radiation Potential Temperature
Precipitation Rate Sea Level Pressure Solar Radiation Surface Winds
Vertical Levels:
Ground or water surface Mean sea level 0.99255 sigma
Temporal Frequencies:
Every 6 hours (Mean)
Data Types:
Spatial Coverage:
Longitude Range: Westernmost=180W Easternmost=180E
Latitude Range: Southernmost=90S Northernmost=90N Detailed coverage information
Data Contributors:
National Center for Atmospheric Research, University Corporation for Atmospheric Research
Raeder, K., J. L. Anderson, N. Collins, T. J. Hoar, J. E. Kay, P. H. Lauritzen, and R. Pincus, 2012: DART/CAM: An Ensemble Data Assimilation System for CESM Atmospheric Models J. Climate, 25, 6304-6317 (DOI: 10.1175/JCLI-D-11-00395.1).

Anderson, J., T. Hoar, K. Raeder, H. Liu, N. Collins, R. Torn, and A. Arellano, 2009: The Data Assimilation Research Testbed: A Community Facility Bull. Amer. Meteor. Soc., 90, 1283-1296 (DOI: 10.1175/2009BAMS2618.1).

Total Volume:
1.52 TB
Data Formats:
Metadata Record:
Data License:
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