C-GLORS Eddy-permitting reanalyses
CHOR Historical reanalyses
Created on 6th June 2014
NEMO Ocean Model
Climate Data Guide
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.