HYDROGRAPHIC CONDITIONS IN THE CHUKCHI SEA AND ST. LAWRENCE ISLAND POLYNYA REGION IN MIDSUMMERS OF 1990, 1991 AND 1992 (15th Symposium on Polar Biology)

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Oceanographic observations and fish exploratory surveys were carried out in the Chukchi Sea and St. Lawrence Island Polynya regions in midsummers of 1990, 1991 and 1992. We report here the hydrographic conditions in these regions and consider their implications for marine ecology. In the surveyed area off St. Lawrence Island the bottom water showed temperature below 0℃ in all three years in late July. Near St. Lawrence Island the bottom waters were colder and more saline than those in the offshore region every year. This suggests that coastal upwelling occurred near the island. In the Chukchi Sea, hydrographic conditions near the pack ice showed remarkable two-layer structure consisting of the warmer, fresher upper water and colder, saline lower water. The highest static stability of 40×1O^<-5> m^<-1> existed between the two layers near the pack ice. The strong stratification disappeared in the ice free sea.
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