The figure below shows an overview of the CMCC Historical Oceaan Reanalysis system (CHOR).
CHOR in a nutshell:
Sketch of the analysis and forecast steps
CHOR is run at 1/2 degree horizontal resolution and covers the entire
XX century (1900-2010).
Unlike C-GLORS, CHOR uses historical atmospheric reanalyses (e.g. 20CRv2, ERA-20C) as forcing, does not assimilate altimetry data and does not
implement bias correction schemes.
Details of CHOR formulation and configuration
are provided by Yang et al. (2016, QJRMS)