Fig. 6 shows the observed sea surface anomaly on November 5, 1997 taken from AVISO. The simulated sea surface anomalies on November 5 calculated using the drag coefficient as 1.3 103 , depending on the wind speed and 2.5 103 are shown in Fig. 7. The sea surface anomaly from the cases carried out using a constant drag coefficient, 1.3 103 and 2.5 103 , are compared with those using the drag coefficient depending on the wind speed.