Fig. 8
From: Benefits of radar-derived surface current assimilation for South of Africa ocean circulation
RMSE maps between the two forecast initiated from FREE and 4DVAR and the HF radar data. Top panels (a, b) show surface currents intensities RMSE differences for the first (a) and the second (b) day of forecast. Surface currents directions RMSE differences for the first (c) and the second (d) day of forecast. Blue color means that the RMSE is reduced in the case of forecast issued from 4DVAR initial condition