Sentences with phrase «about atmospheric methane»

Not really, because the one real hard fact that we know about atmospheric methane is that it's concentration isn't rising very quickly.

Not exact matches

Ice core records show atmospheric methane levels plunged from about 700 parts per billion to just 500 ppb at the time of their extinction.

Since methane can cause about 20 times as much atmospheric warming as carbon dioxide, curbing methane would help slow global warming.

For months of weekly press conferences, reporters had been asking about Curiosity's analyses of atmospheric methane on Mars.

The amount of atmospheric methane has remained relatively stable for about a decade, but concentrations began to rise again in 2007.

Patrick Crill, an American biogeochemist at Stockholm University, says ice core data from the past 800,000 years, covering about eight glacial and interglacial cycles, show atmospheric methane concentrations between 350 and 800 parts per billion in glacial and interglacial periods, respectively.

In fact, while methane is a atmospheric characteristic of giant gas planets like Jupiter, the only brown dwarf found to even have a trace of methane was Gliese 229 B, which orbits a reddish, M - class dwarf located about 20 light - years away from Earth.

... The Earth's atmospheric methane concentration has increased by about 150 % since 1750, and it accounts for 20 % of the total radiative forcing from all of the long - lived and globally mixed greenhouse gases (these gases don't include water vapor which is by far the largest component of the greenhouse effect).

«We know rather little about how much methane comes from different sources and how these have been changing in response to industrial and agricultural activities or because of climate events like droughts,» says Hinrich Schaefer, an atmospheric scientist at the National Institute of Water and Atmospheric Research (NIWA) in New Zealand, who collaborates with Petrenko.

Near Titan's surface, about 5 percent of the atmospheric molecules are methane, the fraction decreasing with altitude.

Raymond Pierrehumbert, an Oxford University atmospheric physics professor who believes cutting carbon dioxide emissions is more urgent than cutting methane emissions, said Howarth's research offers little new information about the role of natural gas production in global warming.

Re # 17, it seems that the isotopic signature of atmospheric methane could tell you something about it's source.

and 1998 snippets Methane now contributes about 20 % to the increased direct radiative forcing by greenhouse gases compared to preindustrial times [Shine et al., 1995] Oxidation of CH4 in the troposphere produces carbon monoxide (CO), can lead production of ozone (03), and involves atmospheric oxidant, the hydroxyl radical (OH).

I think I know what you mean here but in the context of the previous Much Ado about Methane article with discussion of the difference between atmospheric lifetime of a CO2 molecule vs. lifetime of an increase in concentration, this could also be put more clearly.

This is about as far as one could get from high levels (relative to most atmospheric concentrations) of methane over large areas high in the atmosphere in the Arctic where there is very little (direct) human activity.

Methane has a atmospheric lifespan of about a decade.

Since the onset of the Industrial Revolution in about 1750, however, atmospheric methane concentrations shot up to about 1800 parts per billion and are continuing to rise.

It follows that an atmospheric composition of about 8 % methane gives one 360 - 430 degrees of heating, with a fainter sun and a slightly lower albedo.

According to the report, atmospheric methane had reached about 1845 parts per billion (ppb) in 2015, 2.5 times greater than in the pre-industrial era, while nitrous oxide was at 328ppb, 1.2 times above historic levels.

The amount of atmospheric methane had remained relatively stable for about a decade, but concentrations began to rise again in 2007.

Using SCIAMACHY satellite data as well as ground - based measurements from 2003 to 2009, researchers found that the region where Arizona, New Mexico, Colorado, and Utah intersect had atmospheric methane concentrations equivalent to about 1.3 million pounds of emissions a year.

Industry, with the full support of the administration, continues the fait accompli of radically expanded natural gas fracking across the country, with serious unresolved issues about fugitive atmospheric methane emissions and the potential for contamination of drinking water aquifers — and with no adequate federal regulatory structure in place.

Perhaps the author should educate himself about the dwell time of atmospheric methane, it is approximately 12 years.

BTW, I wonder about how the methane release paper you linked to has been impacted by the rather sudden change in atmospheric methane growth rate (near zero)... that seems not to have been anticipated, AFAIK.

The first place I recall reading about the breakdown of methane in water was from: Revelle, Roger (1983), «Methane hydrates in continental slope sediments and increasing atmospheric carbon dioxide,» Changing Climates, Report of the Carbon Dioxide Assessment Committee, pp. 252 — 261, National Academy Press, Washingtonmethane in water was from: Revelle, Roger (1983), «Methane hydrates in continental slope sediments and increasing atmospheric carbon dioxide,» Changing Climates, Report of the Carbon Dioxide Assessment Committee, pp. 252 — 261, National Academy Press, WashingtonMethane hydrates in continental slope sediments and increasing atmospheric carbon dioxide,» Changing Climates, Report of the Carbon Dioxide Assessment Committee, pp. 252 — 261, National Academy Press, Washington, D. C.

The atmospheric methane concentration rose from the preanthropogenic until about the year 1993, at which point it rather abruptly plateaued.

«Shakhova notes that the Earth's geological record indicates that atmospheric methane concentrations have varied between about.3 to.4 parts per million during cold periods to.6 to.7 parts per million during warm periods.

For example, the direct radiative effect of a mass of methane is about 84 times stronger than the same mass of carbon dioxide over a 20 - year time frame [22] but it is present in much smaller concentrations so that its total direct radiative effect is smaller, in part due to its shorter atmospheric lifetime.

[39] A 2014 analysis, however, states that although methane's initial impact is about 100 times greater than that of CO2, because of the shorter atmospheric lifetime, after six or seven decades, the impact of the two gases is about equal, and from then on methane's relative role continues to decline.

Methane has an atmospheric lifetime of about 12 years and a global warming potential of 28 over a hundred - year period.