The results show that before the summer monsoon onset, the air-sea heat exchange near Xisha area is weak, the vapor flux is small and the main trend is that the ocean is being heated; while after its onset, the air-sea heat exchange is balanced roughly.

• 结果表明：季风爆发前，西沙海气界面热量交换较弱，水汽通量较小，以海洋获得热量为主；季风爆发后，海气界面热量交换接近平衡。