 The temperature would sharply drop to at , then slowly decrease to at and remain so down to the seabed.On the contrary, the temperature in the south could gradually decrease to at , then to at and to at , but then it would rise to about near the bottom.This cold layer at about is formed by sinking of cold water in the northern part of the sea in winter and is brought south by the sea currents; it is rather stable and is observed all through the year.