Atmospheric methane

methanemethane cyclemethane in the atmosphereatmosphereMethane cyclingMethane is a potent greenhouse gas
Atmospheric methane is the methane present in Earth's atmosphere.wikipedia
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Methane

methane gasCH 4 liquid methane
Atmospheric methane is the methane present in Earth's atmosphere. Global warming due to fossil fuel emissions has caused Arctic methane release, i.e. the release of methane from seas and soils in permafrost regions of the Arctic.
When methane reaches the surface and the atmosphere, it is known as atmospheric methane.

Greenhouse gas

greenhouse gasescarbon emissionsgreenhouse gas emissions
Atmospheric methane concentrations are of interest because it is one of the most potent greenhouse gases in Earth's atmosphere.
The decrease in GWP at longer times is because methane is degraded to water and through chemical reactions in the atmosphere.

Methane emissions

methanelargest natural sourcemethane pollution
Various sources give the following values for methane emissions:
Methane in the atmosphere has an estimated 100-year global warming potential of 34, meaning that a ton of methane emitted into the atmosphere creates approximately 34 times the atmospheric warming as a ton of carbon dioxide over a period of 100 years.

Methane clathrate

methane hydratemethane hydratesmethane ice
At high pressures, such as are found on the bottom of the ocean, methane forms a solid clathrate with water, known as methane hydrate.
In 2008, research on Antarctic Vostok and EPICA Dome C ice cores revealed that methane clathrates were also present in deep Antarctic ice cores and record a history of atmospheric methane concentrations, dating to 800,000 years ago.

Methanogenesis

methanogenicbiomethanationbiogenic gas
Methanogenesis, the scientific term for methane production, occurs primarily in anaerobic conditions because of the lack of availability of other oxidants.
Atmospheric methane is an important greenhouse gas with a global warming potential 25 times greater than carbon dioxide (averaged over 100 years), and methanogenesis in livestock and the decay of organic material is thus a considerable contributor to global warming.

Formaldehyde

formalinH 2 COmethanal
Both oxidation pathways lead to a net production of formaldehyde and water vapor.
When produced in the atmosphere by the action of sunlight and oxygen on atmospheric methane and other hydrocarbons, it becomes part of smog.

Yedoma

Melting yedoma, a type of permafrost, is a significant source of atmospheric methane (about 4 Tg of CH 4 per year).
Thawing yedoma is a significant source of atmospheric methane (about 4 Tg of per year).

Arctic methane emissions

Arctic methane releaseArcticLarge quantities of methane are stored in the Arctic
Global warming due to fossil fuel emissions has caused Arctic methane release, i.e. the release of methane from seas and soils in permafrost regions of the Arctic.
One of the study researchers noted, "The expectation is that with further sea ice decline, temperatures in the Arctic will continue to rise, and so will methane emissions from northern wetlands."

Enteric fermentation

fermenting
Recent NASA research has confirmed the vital role of enteric fermentation in livestock on global warming.

Atmosphere

atmosphericatmospheresplanetary atmospheres
Atmospheric methane is the methane present in Earth's atmosphere.

Global warming potential

global-warming potentialGWP22 times more powerful
The 20-year global warming potential of methane is 84.

Carbon dioxide

CO 2 CO2carbon dioxide (CO 2 )
That is, over a 20-year period, it traps 84 times more heat per mass unit than carbon dioxide and 32 times the effect when accounting for aerosol interactions.

Aerosol

aerosolsaerodynamic diameteratomization
That is, over a 20-year period, it traps 84 times more heat per mass unit than carbon dioxide and 32 times the effect when accounting for aerosol interactions.

Northern Hemisphere

NorthernNorth HemisphereNorthern Hemispheric
Its concentration is higher in the Northern Hemisphere since most sources (both natural and human) are located on land and the Northern Hemisphere has more land mass. The concentrations vary seasonally, with, for example, a minimum in the northern tropics during April−May mainly due to removal by the hydroxyl radical.

Hydroxyl radical

hydroxyl radicalsOHhydroxyl
Its concentration is higher in the Northern Hemisphere since most sources (both natural and human) are located on land and the Northern Hemisphere has more land mass. The concentrations vary seasonally, with, for example, a minimum in the northern tropics during April−May mainly due to removal by the hydroxyl radical.

History of Earth

Earth's historyhistory of the EarthEarth history
Early in the Earth's history carbon dioxide and methane likely produced a greenhouse effect.

Greenhouse effect

greenhouse warminggreenhousegreenhouse gases
Early in the Earth's history carbon dioxide and methane likely produced a greenhouse effect.

Singlet oxygen

singlet 1 O 2 dioxygen molecule
The dominant sink of methane in the troposphere is reaction with hydroxyl radicals that are formed by reaction of singlet oxygen atoms with water vapor.

Radiative forcing

climate forcingSolar Forcingclimate forcing agents
As of 2011, methane contributed radiative forcing of 0.48 ± 0.05 Wm −2, or about 17% of the total radiative forcing from all of the long-lived and globally mixed greenhouse gases.

Permafrost

discontinuous permafrostcontinuous permafrostsporadic permafrost
Global warming due to fossil fuel emissions has caused Arctic methane release, i.e. the release of methane from seas and soils in permafrost regions of the Arctic. Methane that gets frozen in permafrost – land that is frozen for several years at a time – is slowly released from bogs as the permafrost melts.

Glacier

glaciersglacialglaciated