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The main thrust of this paper is to identify the role of different high-resolution wind forcing fields for the model representation of Antarctic coastal sea ice.Resolving 4-hourly winds from the operational ECMWF and AMPS analyses, we investigate the mean winter response of coastal sea ice of a high-resolution Southern Ocean sea ice-ocean model.Even though the horizontal resolution of both analyses is about the same (about 20 km), striking differences emerge in simulated coastal sea ice and thus the representation of coastal polynyas and net freezing rates.In AMPS, the southeasterly winds along East Antarctica and the southerly winds in the Ross Sea are substantially stronger compared to ECMWF, and overestimated compared to weather station data.