C-GLORS Eddy-permitting reanalyses

CHOR Historical reanalyses






Created on 6th June 2014

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At the moment, two versions of C-GLORS are officially disseminated: C-GLORSv4 and C-GLORSv5. Version 5 contains improvements to the assimilation system (error covariances, sea-ice data assimilation), it is the recommanded version and is being updated in near real-time. Changes and improvements of C-GLORS v5 with respect to v4 are detailed in:
Storto, A., Masina, S. (2016), C-GLORSv5: an improved multi-purpose global ocean eddy-permitting physical reanalysis, Earth Syst. Sci. Data Discuss., doi:10.5194/essd-2016-38, 2016 (in review for Earth Syst. Sci. Data).


Two versions of the CHOR historical reanalyses covering the XX century are available at the moment, their difference consisting in the way SST data are assimilated:
CHOR_AS directly ingests in-situ SST data from ICOADS in the variational data assimilation scheme;
CHOR_RL implements an SST relaxation scheme towards HadISST analyses. Both of them assimilate hydrographic profiles from EN4 and are forced by the NOAA/CIRES 20CRv2 atmospheric reanalyses. Relative merits of the two strategies for the SST data assimilation are discussed in:
Yang, C., Masina, S., Storto, A. (2016), Historical ocean reanalyses (1900-2010) using different data assimilation strategies, Accepted in Q. J. Roy. Met. Soc.
Two more versions forced by ERA-20C, still differing for the SST data assimilation strategy, will be soon made available.

C-GLORS > Versions