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Known issues
1. Sea-ice accumulation
In CERA-20C, Currently there are no known issues with CERA-20Cseveral issues with settings of the sea-ice coupling with the IFS that result in too cold atmospheric surface temperature over the sea-ice regions. The summer melting is not strong enough and sea-ice is accumulating over the years, particularly in the Arctic. The sea surface temperature relaxation allows to limit the impact on the sea-ice extent.
2. Discontinuity between streams
CERA-20C was conducted in 14 streams of 8 years with two-year overlap with initial conditions from uncoupled ocean and atmosphere reanalyses. There is an initialization shock at the start of each stream. While the atmosphere is adjusting relatively fast, the ocean needs much more than two years to reach equilibrium. The ocean model drift is visible in the CERA-20C record particularly in the early 20th century and in the ocean interior where the observational constraint is low.
Data access
Data is archived at ECMWF and available for download from ECMWF data services.
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