申論題

(3) View the latitudinal distribution of the global NPP below. A is global average, B is land average, and C is ocean average. Different lines indicate different seasons as explained in the figure captions. Please describe the latitudinal distribution patterns for NPP for land (5 pt) and ocean (5 pt) respectively. You may have noticed that for both land and ocean NPP. there is a local minimum around 20-30 degree N/S. Do they have similar or different reasons? Please explain. (10 pt)