Methane (CH4) is a powerful greenhouse gas and plays a key part in global atmospheric chemistry. Natural geological emissions (fossil methane vented naturally from marine and terrestrial seeps and mud volcanoes) are thought to contribute around 52 teragrams of methane per year to the global methane source, about 10 per cent of the total, but both bottom-up methods (measuring emissions)1 and top-down approaches (measuring atmospheric mole fractions and isotopes)2 for constraining these geological emissions have been associated with large uncertainties.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/minimal-geological-methane-emissions-during-younger-dryas%E2%80%93preboreal-abrupt-warming
[2] http://admin.indiaenvironmentportal.org.in/category/author/vasilii-v-petrenko
[3] http://admin.indiaenvironmentportal.org.in/category/author/andrew-m-smith
[4] http://admin.indiaenvironmentportal.org.in/category/author/hinrich-schaefer-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/methane
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/antarctica
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossil-fuels
