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The assimilation employed with the
ocean component of the HadGEM2 model uses a three- dimensional optimal interpolation scheme with a horizontal resolution of 1º and equatorial refinement (0.3º meridional resolution within 5º
of the equator). The first guess is obtained by forcing the ocean model
with daily fluxes of momentum, heat and fresh water from the ERA-40
reanalysis for the period January 1959 to June 2002 and ECMWF NWP
operational analysis thereafter. It assimilates subsurface temperature
and salinity. The subsurface observations come from the quality- controlled dataset prepared for the ENACT and ENSEMBLES projects until
2004 (Ingleby and Huddleston, 2007), and from the GTS thereafter
(ENACT/GTS). The model SSTs are strongly relaxed to analyzed daily SST
maps from the OIv2 SST product.
Ingleby, B. and M. Huddleston, 2007. Quality control of ocean temperature and salinity profiles: historical and real-time data. J. Mar. Sys., 65, 158-175.
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