Lake Vostok

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Lake Vostok
Lake Vostok - When photographed from space by radar, Lake Vostok can be seen as a flat area inside the ice sheet. (NASA GSFC)
When photographed from space by radar, Lake Vostok can be seen as a flat area inside the ice sheet. (NASA GSFC)
Coordinates 77°0′S 105°0′E / 77°S 105°E / -77; 105Coordinates: 77°0′S 105°0′E / 77°S 105°E / -77; 105
Lake type subglacial rift lake
Basin  countries (Antarctica)
Max. length 250 km
Max. width 50 km
Surface area 15,690 km²
Average depth 344 m
Max. depth 1,000 m
Water volume 5,400 ± 1,600 km³
Residence time 1,000,000 yrs
Islands 1 (found May 2005)
Settlements Vostok Station

Lake Vostok is the biggest of the seventy lakes in Antarctica that are under the ice. It is at 77° S 105° E. It is under Russia's Vostok Station. It is 4000 meters (13,000 feet) under Antarctica's surface.

The lake was found by Russian and British scientists. They used radar to find it.

The lake consists of fresh water. The temperature of the water is about -3°C. The freezing point of water is at 0 C, but the water in the lake remains liquid because of the high pressure of the ice.

There are two separate basins in the lake. These are separated by a ridge. It has been suggested that the ecosystems of the two basins are different.

Pressure and oxygen[change | change source]

Lake Vostok is an oligotrophic extreme environment. It is supersaturated with oxygen. The levels of oxygen are fifty times higher than those typically found in ordinary freshwater lakes on Earth. The weight of the ice on top of lake Vostok is believed to add to the high concentration of oxygen. Oxygen from the ice gets dissolved into the water of the lake. Deposits of oxygen and other gases are trapped in the lake as well. The structure that traps them is called a clathrate. Gases trapped in clathrates are enclosed in ice, they look like packed snow. These structures form at the high-pressure depths of Lake Vostok; they would become unstable if brought to the surface.[1]

Life[change | change source]

No other natural environment on earth is as rich in oxygen. For this reason, if there are any forms of life in the lake, these would probably need to have adapted to the high levels of oxygen, to be able to survive there. Some adaptations might include high concentrations of protective enzymes.

The environment in the lake is very similar to that on Jupiter's moon Europa or Saturn's moon Enceladus. Finding life in the lake would therefore make it more probable that life has existed on one of these moons.[2]

References[change | change source]

  1. Siegert MJ (2000). "The identification, examination and exploration of Antarctic subglacial lakes". Sci Prog 83 ( Pt 3): 223–42. PMID 11077478 .
  2. "Mystery of Antarctica's 15-million year-old lake". The Daily Galaxy. 2007-12-04. http://www.dailygalaxy.com/my_weblog/2007/12/secret-life-o-1.html. Retrieved 2009-07-01.

Other websites[change | change source]