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Methane is a chemical compound with the chemical formula CH4. It is the simplest alkane, and the principal component of natural gas. Methane's bond angles are 109.5 degrees. Burning methane in the presence of oxygen produces carbon dioxide and water. The relative abundance of methane makes it an attractive fuel. However, because it is a gas at normal temperature and pressure, methane is difficult to transport from its source. In its natural gas form, it is generally transported in bulk by pipeline or LNG carriers; few countries transport it by truck.
Methane was discovered and isolated by Alessandro Volta between 1776 and 1778 when studying marsh gas from Lake Maggiore.
Methane is a relatively potent greenhouse gas. Compared with carbon dioxide, it has a high global warming potential of 72 (calculated over a period of 20 years) or 25 (for a time period of 100 years). Methane in the atmosphere is eventually oxidized, producing carbon dioxide and water. As a result, methane in the atmosphere has a half life of seven years.
The abundance of methane in the Earth's atmosphere in 1998 was 1745 parts per billion (ppb), up from 700 ppb in 1750. By 2008, however, global methane levels, which had stayed mostly flat since 1998, had risen to 1,800 ppb. By 2010, methane levels, at least in the arctic, were measured at 1850 ppb, a level scientists described as being higher than at any time in the previous 400,000 years. (Historically, methane concentrations in the world's atmosphere have ranged between 300 and 400 ppb during glacial periods commonlly known as ice ages, and between 600 to 700 ppb during the warm interglacial periods).
In addition, there is a large, but unknown, amount of methane in methane clathrates in the ocean floors. The Earth's crust contains huge amounts of methane. Large amounts of methane are produced anaerobically by methanogenesis. Other sources include mud volcanoes, which are connected with deep geological faults, landfill and livestock (primarily ruminants) from enteric fermentation.
Originally posted by JohnnyCanuck
reply to post by letthereaderunderstand
I heard this some time back. Apparently there is a great deal of the gas jsut off the continental shelf, and it is subject to releases that can 'sink' a ship, and cause an aircraft to fall out of the sky...hence a potential casual factor behind the Bermuda Triangle. S&F for bringing forth an interesting thread.
Originally posted by justadood
it makes a lot more sense than many of the theories given to explain the 'bermuda triangle'
Originally posted by Chamberf=6
I saw this mentioned on one of the numerous Discovery or History channel shows.
They speculated about whether a large burst of methane from the ocean could take down airplanes too. Something about the methane being lighter than the surrounding air and making pilots lose control...
It was last year when I saw the show, so sorry about being foggy about it.
According to two research scientists the mystery of vanished ships and airplanes in the region dubbed "The Bermuda Triangle" has been solved. Step aside outer space aliens, time anomalies, submerged giant Atlantean pyramids and bizarre meteorological phenomena ... the "Triangle" simply suffers from an acute case of gas. salem-news.com...