To be consistent with the validating sea ice extent index from NSIDC, if possible, please first compute the average sea ice concentration for the month and then compute the extent as the sum of cell areas > 15%. [...] The ocean and sea ice initial conditions at the beginning of the hindcast were derived from the 32-year spin-up of the ocean-sea ice model only (RASM G-case) forced with CORE2 reanalysis for 1948-1979. [...] The initial conditions for the July Sea Ice Outlook were derived from the RASM 1979-2020 hindcast and are physically and internally consistent across all the model components. [...] If you use a dynamic model, please specify the name of the model as a whole and each component including version numbers and how the component is initialized: [DynamicModelType] If available from your method. [...] The uncertainty of pan-Arctic September sea ice extent was estimated from the 31-member ensemble.
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