Abstract:

From July 20 to 30,1999, China R/V Xuelong occupied 22 stations in the Bering Basin on the cruise of China First Arctic Science Expedition. The chemical samplings are sum of 271. For vertical distributions of silicate , phosphate , and dissolved inorganic nitrogen (nitrate plus ammonium plus nitrite), the similar point is that there are three layers with two nutriclines. The first layer is in 25m; the followings are obvious nutriclines; the second layer is between 50m and 200m; then there are plain nutriclines; and the third layer is from 500m to bottom (~3900 m). The difference is in the third layer, where slowly increases with depth, but and slowly decrease or remain the same with depth. Vertical oxygen and and and profiles indicate the sea waters within the potential temperature (θ) minimum layer (0.5-2.7°C, salinity of 33.01-33.17,depth of 81-157 m) are active layer of atmospheric oceanic exchange and main layer of biological action. The decreases relate with both and increase in ≥150 m. The : ratios (=9+ and =135+) of the sea waters of the Bering Basin are uniformly 0.786-1.029, indicating that nutrient features of the northern and central Bering Basin seawaters are rather conservative.