In area east of W1 and south of W2, there is a cold and cyclonic eddy C1,where the upwelling of cold water is evident. The upwelling is mainly in 200-500 m;

• 在W1以东及W2以南海域为冷水区；主要气旋式冷涡为C1；这里冷水涌升明显；涌升最强的层次位于200-500 m层.