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Density rules. The heaviest, or most dense, water will always be on the bottom. Pure water is densest at 4 C . To make it heavier, it has to get saltier. As the surface of the Arctic ocean freezes, the left-behind part is very salty water at 3 to 4 C. This North Atlantic Deep Water sinks to the bottom and flows worldwide. Warmer less salty water sits on top of it.
In the Antarctic, there is no warmer fresher water to sit on top of it, so NADW is exposed at the surface. When fresh water freezes out at the surface, this already salty and cold water gets even saltier and can cool to about -0.8C before sinking. This is Antarctic Bottom Water - the deepest, coldest water layer in the world.
An interesting point is that the Marianas Trench, the deepest spot in the oceans, is only at about plus 2 C. This is because it is completely surrounded by water shallow enough (at only a mile or so deep) that AABW would have to flow uphill to get to it.
What else can I help you with?
Trenches are the deepest parts of the ocean floor which of the earth's four oceans hs the deepest trenches?
The Pacific Ocean has the deepest trenches.
Deepest point of Molloy Deep in Which Ocean?
The deepest point of Molloy Deep is located in the Indian Ocean. The Indian Ocean is the smallest ocean in the world.
What is the deepest trench in the world?
The deepest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench at a depth of 10,911 m (35,798 ft) below sea level.Underwater the Marianas Trench would be the deepest Trench in the World.Challenger Deep's Deepest part is about 35,838 feet deep (11035 meters).The deepest point in any ocean is the Mariana Trench (aka Challenger Deep) in the western Pacific Ocean at 11,033 metres deep.
Deepest point in the arctic ocean?
Deepest Point in the Arctic OceanEurasia Basin: 17,881 feet / 5450 meters
What ocean is the Mariana Trench located?
The Mariana Trench is the deepest point in any ocean and is located in the Pacific Ocean.
