2002
DOI: 10.1046/j.1468-8123.2002.00027.x
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The geological methane budget at Continental Margins and its influence on climate change

Abstract: Geological methane, generated by microbial decay and the thermogenic breakdown of organic matter, migrates towards the surface (seabed) to be trapped in reservoirs, sequestered by gas hydrates or escape through natural gas seeps or mud volcanoes (via ebullition). The total annual geological contribution to the atmosphere is estimated as 16-40 Terragrammes (Tg) methane; much of this natural flux is 'fossil' in origin. Emissions are affected by surface conditions (particularly the extent of ice sheets and permaf… Show more

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Cited by 301 publications
(216 citation statements)
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“…Based on timescale considerations, Rehder et al, 1999) proposed that the relevant process is the transport to the winter wave-mixed-layer, i.e., the deepest thermocline depth. Marine CH4 emissions occur from all global coastal oceans from biogenic and thermogenic sources (Judd et al, 2002). The latter are associated with petroleum reservoirs, which often are under production.…”
Section: Geologic Marine Methane Importancementioning
confidence: 99%
“…Based on timescale considerations, Rehder et al, 1999) proposed that the relevant process is the transport to the winter wave-mixed-layer, i.e., the deepest thermocline depth. Marine CH4 emissions occur from all global coastal oceans from biogenic and thermogenic sources (Judd et al, 2002). The latter are associated with petroleum reservoirs, which often are under production.…”
Section: Geologic Marine Methane Importancementioning
confidence: 99%
“…Hydrologic activity at cold seeps along continental margins and plate boundaries also releases sulfide-, methane-, and ammoniarich fluids from the sediment (reviewed in van Dover 2000;Judd 2003). Mud volcanoes are formed when water, mud, and gas (usually dominated by CH 4 , but may include CO 2 or nitrogen) are expelled from sedimentary sequences at zones of tectonic compression (Hedberg 1980;Brown 1990;Milkov 2000;Judd et al 2002). The methane derived from these environmental sources forms a significant proportion of the global carbon budget (Hornafius et al 1999;Judd et al 2002).…”
Section: Known Environments Inhabited By Methanotrophic Symbiosesmentioning
confidence: 99%
“…Mud volcanoes are formed when water, mud, and gas (usually dominated by CH 4 , but may include CO 2 or nitrogen) are expelled from sedimentary sequences at zones of tectonic compression (Hedberg 1980;Brown 1990;Milkov 2000;Judd et al 2002). The methane derived from these environmental sources forms a significant proportion of the global carbon budget (Hornafius et al 1999;Judd et al 2002). Methane is generated via both biogenic and inorganic processes in seabed fluids (reviewed in Judd et al 2002;Judd 2003).…”
Section: Known Environments Inhabited By Methanotrophic Symbiosesmentioning
confidence: 99%
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