Is AABW more dense than NADW?

The AABW is dense enough to fill up the deep basins of the South Atlantic. The NADW is less dense and so it rises up over the AABW and fills up the mid-depths of the South Atlantic when the water masses meet. The dense AABW (coloured blue) spreads northwards along the sea floor and the NADW (brown) spreads south.

What are NADW and AABW?

In the modern ocean, fresher water masses from the southern ocean, Antarctic Bottom Water (AABW) and Antarctic Intermediate Water (AAIW) lie below and above NADW, respectively. These different water masses can also be recognized by their carbon isotope signatures (See figure on left).

What and where is the AABW?

Antarctic bottom water (AABW) is the densest global-scale water mass. It is produced around Antarctica, sinks along the Antarctic continental slope and spreads northward to fill most of the ocean deeper than 4 km (Orsi et al., 1999).

How deep Is Antarctic Intermediate?

about 1,650 to 4,000 ft
Antarctic Intermediate Water, ocean water mass found in all the southern oceans at depths of about 1,650 to 4,000 ft (500 to 1,200 m), characterized by temperatures of 37° to 45° F (3° to 7° C) and salinities of 33.8 to about 34.5 parts per thousand.

Is AABW colder than NADW?

All varieties of AABW are very cold and relatively fresh in comparison to North Atlantic Deep Water (NADW).

Why are NADW and AABW important for global ocean circulation?

They influence the density structure of the deep ocean and thereby lead to alterations in the strength of the ACC. Changing the wind stress south of 30°S influences the magnitude of the deep water production of both hemispheres.

Why are NADW and AABW important for ocean circulation?

The “Ocean Conveyor Belt” NADW moves south through the western Atlantic before meeting the AABW north of the Weddell Sea. Together these water masses move eastwards into the Indian and Pacific Oceans. By this time the NADW and AABW have started mixing, to create what is called Common Water.

Why is AABW important?

The formation of dense Antarctic Bottom Water (AABW) and its export northward from the Antarctic continent is one of the key components of the global ocean overturning circulation, and plays a critical role in regulating Earth’s climate on multi-decadal-to-millennial time scales.

How deep is the water under Antarctica?

“If you could squeeze out all that water and pool it on the surface, the water would range anywhere from about 220m in depth all the way up to 820m.

How deep is the Pacific Ocean?

36,161′Pacific Ocean / Max depth
The Pacific is also our planet’s deepest water body, with an average depth of approximately 4,000 meters (13,000 feet). The deepest place on Earth, known as Challenger Deep, extends to a depth of more than 11,000 meters (36,000 feet) and is found in the Mariana Trench, in the Pacific.

What is the center of a gyre called?

The center of a subtropical gyre is a high pressure zone. Circulation around the high pressure is clockwise in the northern hemisphere and counterclockwise in the southern hemisphere, due to the Coriolis effect.

What’s the coldest water in the world?

A new technique created by an international team of European researchers recently helped break the record for coldest liquid water by measuring a temperature of minus 44.59 degrees Fahrenheit (minus 42.55 degrees Celsius, 230.6 Kelvin for anyone wondering), according to the American Physical Society.

Why is the NADW important?

NADW and its formation is essential to the Atlantic Meridional Overturning Circulation (AMOC), which is responsible for transporting large amounts of water, heat, salt, carbon, nutrients and other substances from the Tropical Atlantic to the Mid and High Latitude Atlantic.

Where is NADW formed?

NADW is formed in the Baffin Bay, the Labrador and the Norwegian-Greenland Sea. The advected waters evaporate, become more saline, cool and sinks down, carrying atmospheric carbon with it (Dittert et al., 1999).

Where does AABW flow?

The Vema Channel is a pathway of Antarctic Bottom Water (AABW, potential temperature θ < 2 ºC) flow to the north over the Rio Grande Rise (Fig. 1).

What was found under Antarctica?

The team discovered 77 species — including sabre-shaped bryozoans (moss animals) and serpulid worms — more than the total number previously known from all the frozen continent’s ice shelves. The team concludes that there must be enough algae carried under the ice shelf from open water to fuel a strong food web.

What are the 4 currents in the South Pacific Gyre?

The gyre is generated by four prevailing ocean currents that move in a clockwise round pattern: To the north is the North Pacific Current, to the east is the California Current, to the south is the North Equatorial Current, and to the west is the Kuroshio Current.