User Tools

    To create and edit articles, please register and log-in

Main Menu : categories & index etc.

Main menu
Click categories to expand


A-Z listingplugin-autotooltip__plain plugin-autotooltip_bigA-Z listing

This is an alphabetical index of all content pages.


Other categories

Utilities

Contact
Register
Sandbox

Also see

Importance Ratings
News
Legal
Donate/Sponsor
Curator's rationale
AI Policy



Twitter feed 𝕏



Feeds + s.e.o. etc.
rss / xml feed
sitemap file
A-Z listing (archived)


Indexed under : Earth Sciences

Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown

Global Atmospheric Methane Cycle

Methane is roughly 80 times more potent as a Greenhouse Gas (GG) than CO2. Over the last 30 years, the measured levels in the atmosphere have been steadily rising, - maintaining a clearly-defined seasonal cycle.

Methane is an important greenhouse gas, responsible for about 20% of the warming induced by long-lived greenhouse gases since pre-industrial times. By reacting with hydroxyl radicals, methane reduces the oxidizing capacity of the atmosphere and generates ozone in the troposphere. Although most sources and sinks of methane have been identified, their relative contributions to atmospheric methane levels are highly uncertain.“

Source : Three decades of global methane sources and sinks, Nature Geoscience, 2013

As noted above, reactions with hydroxyl radicals are foremost in 'sinks' to absorb methane - but their production is unclear.

The most important sink in the methane cycle is reaction with the hydroxyl radical, which is produced photochemically in the atmosphere. Production of this radical is not fully understood and has a large effect on atmospheric concentrations.”

More info at: Wikipedia

The balance between sources and sinks of methane is not yet fully understood. The IPCC Working Group I stated in chapter 2 of the Fourth Assessment Report that there are 'large uncertainties in the current bottom-up estimates of components of the global source', and the balance between sources and sinks is not yet well known.“

According to the US National Oceanic and Atmospheric Administration (NOAA) global atmospheric methane levels increased by a record amount in 2021, for the second year in a row. Source : NOAA

Note :

As far as Wikenigma has been able to determine, none of the widely used computational Climate Models currently take account of methane levels.


Also see : Methane hydratesplugin-autotooltip__plain plugin-autotooltip_bigMethane hydrates

Mehane hydrates - a.k.a. methane clathrates - are an important factor in total global methane levels (see Global Atmospheric Methane Cycle)

They are commonly found in permafrost deposits and on (and under) the sea floor, being a frozen, naturally‐occu…
and Aerobic methane productionplugin-autotooltip__plain plugin-autotooltip_bigAerobic methane production

From 2005 onwards, satellite-based observations found elevated levels of methane (CH4) in the atmosphere above evergreen forests in tropical regions.

Methane is a very potent greenhouse gas, and intense research effort went into trying to di…

Importance Rating


    Please share this page to help promote Wikenigma !

Dear reader : Do you have any suggestions for the site's content?

Ideas for new topics, and suggested additions / corrections for older ones, are always welcome.

If you have skills or interests in a particular field, and have suggestions for Wikenigma, get in touch !


Or, if you'd like to become a regular contributor . . . request a login password. Registered users can edit the entire content of the site, and also create new pages.

( The 'Notes for contributors' section in the main menu has further information and guidelines etc.)

Automatic Translation

You are currently viewing an auto-translated version of Wikenigma

Please be aware that no automatic translation engines are 100% accurate, and so the auto-translated content will very probably feature errors and omissions.

Nevertheless, Wikenigma hopes that the translated content will help to attract a wider global audience.

Show another (random) article

Further resources :

DOKUWIKI IMPLEMENTATION DESIGN BY UNIV.ORG.UK DECEMBER 2023