申論題

1. The upper panel of Fig. I shows annual-m mean SST (black conto tours at I℃ intervals; contours of SST greater than 27℃ thickened) and precipitation (white contours the lower paneI shows surface wind stress vectors (N m2) and the 20℃ isothermal depth (contours at 20 m intervals: shade ＜ 100 m). Based on Fig. I and dynamics, describe concisely the main features and primary causes of the following: (total 30 points]