Almost always warmer at the surface.
The water that forms far below the surface is called a Deep Current.
Thermal Layer
Thermal Layer
Rechanging
The primary process that cools the ocean is evaporation, where water at the ocean's surface turns into water vapor, taking heat energy with it. Additionally, mixing of colder deep water with warmer surface water through ocean currents can also contribute to cooling the ocean.
Fog may form as much colder air moves over warmer ocean surface water. As the ocean evaporates into the colder air, it saturates the air producing fog that looks like streamers rising off the water.
Stream like movements of water that occur near the surface of the ocean are called surface currents. Stream like movements of ocean water far below the surface are known as a deep current.
Ocean water off the Antarctic coast is between 32F degrees and about 27F degrees, based on the salinity of the water. It's always warmer in the ocean water than it is above the surface of the water.
The water at the surface of the ocean is generally warmer and more oxygen-rich due to exposure to sunlight and atmospheric interaction, supporting a diverse range of marine life. In contrast, water hundreds of meters below is colder, denser, and often has higher pressure, with reduced light penetration and lower oxygen levels. This deeper water can also contain different nutrient profiles and is less influenced by surface weather conditions. Overall, these differences create distinct ecological zones within the ocean.
Deep currents are streamlike movements of water that flow very slowly along the ocean floor. Deep currents occur when the cold, dense water from the poles sinks below warmer, less sense ocean water and flows towards the equator.
upwhelling
When the light from the sun touches the surface of the water in oceans, the water absorbers the heat in the rays from the sun. Due to ice melting their is more water and it traps more heat inside the water making the oceans warmer and warmer.