《Table 1 Summary of HY-2A SCAT sea surface wind validations》

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《Comparison of sea surface wind field measured by HY-2A scatterometer and WindSat in global oceans》

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The scatterometer aboard the HY-2A satellite（hereafter HY-2A SCAT）is the fi rst Chinese scatterometer used for global sea surface wind measurements（Jiang et al.，2012）.The operational requirements of HY-2A SCAT wind data for sea surface wind speed and direction are 2.0 m/s and 20°in terms of root mean square error（RMSE）.Thus far，several studies evaluating of the sea surface wind measurements of HY-2A SCAT have been reported.Table 1 gives a summary of the validation experiments conducted on HY-2A SCAT wind data.The validations suggest that the HY-2A SCAT sea surface wind speed is slightly underestimated with a bias of less than0.5 m/s and a root mean square error（RMSE）of less than 1.5 m/s.For sea surface wind direction，the bias is less than three degrees in all three validation experiments，while the RMSE varies.In the studies of Wang et al.（2013）and Wu and Chen（2015），the RMSE of sea surface wind direction is consistent，which is approximately 20°compared with in situ buoy measurements.However，Yang et al.（2014）indicates a larger RMSE of approximately 40°compared with both the European Centre for MediumRange Weather Forecasts（ECWMF）reanalysis model results and buoy measurements.