The role of wind forcing from operational analyses for the model representation of Antarctic coastal sea ice

摘要: Abstract An accurate representation of Antarctic coastal sea ice in Earth System Models is important as it affects the rate Bottom Water formation. Here we investigate effect using relatively high-resolution (∼20 km) near-surface wind fields two different operational analyses (from European Centre for Medium-Range Weather Forecasts (ECMWF), and Mesoscale Prediction (AMPS)) to force a sea-ice - ocean model. We focus on impact polynya formation winter. Even though horizontal resolution both about same, striking differences emerge simulated thus polynyas net freezing rates. In AMPS, offshore winds are up 10 m s −1 stronger than those ECMWF, mostly overestimated compared weather station data. This leads major drift, concentration, thickness, well discrepancies annual 5 m per year. To identify reasons scrutinized their orography, boundary-layer stratification, boundary conditions, large-scale atmospheric circulations, data assimilation initialization schemes, parameterization subgrid-scale orographic effects. The final factor explained most along steep coastlines, whereas stratification mainly consequence surface winds. procedure biased AMPS toward NCEP analyses, which probably overestimate result coarse-resolution orography. conditions circulations turned out have minimal effect.