CORe is an atmospheric reanalysis produced by the Climate Prediction Center (CPC) NCEP/NWS/NOAA, in collaboration with the Environmental Modeling Center (EMC) NCEP/NWS/NOAA and the Physical Sciences Laboratory (PSL) NOAA. CORe is designed to replace the Climate Data Assimilation System (CDAS), the real-time extension to the NCEP/NCAR Reanalysis. CORe spans a similar time period as CDAS, covering 1950 to near real time (compared to 1948 to near real time for CDAS), and is designed to support climate monitoring, one of the major missions of CPC. Unlike most modern reanalyses, CORe does not assimilate satellite radiance data except for Atmospheric Motion Vectors (AMV). This approach was chosen to minimize spurious "climate shifts" caused by the introduction of satellite observations, an issue that affected earlier NCEP/NCAR and Climate Forecast System Reanalyses. As a result, CORe prioritizes improved climate trends and anomalies rather than optimizing the best atmospheric state for weather forecasting.

Descriptions of the CORe can be found in the following presentations and documents

1. A brief introduction to CORe
2. Improvements that CORe brings to climate monitoring
3. Concepts of the CORe design
4. Configuration of CORe
5. Evaluation data sets
6. For more information (PNS documentation)

Archive

Status

1. NCEP Director approved making CORe operational (implementation started 9/24/2024)
2. NCEP Director approved running CDAS for 1 year for internal conversion to CORe.
3. NCEP Director wanted stopping the public distribution of CDAS 30 days being operational.
4. CORe was implemented on March 19, 2026.

CORe archive page
regridding CORe files
making time ave CORe files

comments: Leigh.Zhang@noaa.gov
modified 4/1/2026