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-GLORSv5 and C-GLORSv7.
Version 7 contains improvements to the observation
quality check, model configuration and higher vertical resolution,
and it is the recommanded version,
updated in near real-time.
Note however that C-GLORSv7 covers the period 1990-2016,
while C-GLORSv5 spans the period 1980-2015,
therefore for longer timeseries from 1980 C-GLORSv5
is the reference version.
Data from previous versions (C-GLORS v4) are still
present in the ftp data server.
For version 7, we also disseminate
analysis and bias correction increments,
plus the control run monthly mean
data (i.e. the corresponding simulation without data assimilation),
as well as
ancillary files (geometry, forcing).
Four members of the
CHOR historical reanalyses covering the XX century are available
at the moment, their difference consisting in the
atmospheric forcing and in the way
SST data are assimilated:
CHOR_AS and CHORE_AS directly ingest in-situ SST data from ICOADS in the
variational data assimilation scheme;
CHOR_RL and CHORE_RL implement an SST relaxation scheme
towards HadISST analyses.
CHOR_ reanalyses are forced by 20CRv2 from NOAA/CIRES,
while CHORE_ from the ECMWF ERA-20C historical reanalysis.
All of them assimilate hydrographic profiles from EN4.
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.