The GloSea6 forecasts initialised on 22 and 23 February were initialised with low Arctic sea ice extents. This resulted from corrupt data used in the derivation of ocean initial conditions. The sea ice largely recovers in these forecasts, but is biased low through the whole 6-month forecast compared to neighbouring days.
Initial sea-ice conditions for different GloSea6 February 2021 start dates:
Evolution of sea-ice fraction forecasts for different GloSea6 February 2021 start dates:
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