Sentences with phrase «methane in the atmosphere over»

Now, my other question (and I am capable of doing my own research, but I'm just wondering if anyone knows off the top of their head), is how do these concentrations compare with historical levels of methane in the atmosphere over the arctic?

To crunch its numbers, the EPA calculated the average concentration of methane in the atmosphere over a 100 - year period and determined that over that period methane is 21 times more potent than carbon dioxide.

Not exact matches

Methane or natural gas is 72 times more potent at capturing heat in the atmosphere than carbon dioxide over the first 20 years after release - and to deal with climate change, we need to focus on the next few decades.

On two days of airplane flights over the area, the research team detected high concentrations of methane in the atmosphere.

Reports of plumes or patches of methane in the Martian atmosphere that vary over monthly timescales have defied explanation to date.

Harvesting that landfill methane for use as a fuel also offers greenhouse gas reductions, since methane traps 23 times as much heat in the atmosphere as CO2 over a century.

(Over the course of a century, methane traps heat in Earth's atmosphere about 25 times as effectively as carbon dioxide; nitrous oxide does so almost 300 times as effectively over the same intervOver the course of a century, methane traps heat in Earth's atmosphere about 25 times as effectively as carbon dioxide; nitrous oxide does so almost 300 times as effectively over the same intervover the same interval.)

It could have delivered a large amount of methane, and over time the abundance in the atmosphere would have declined to its present value.

Methane has a relatively short life in the atmosphere where it oxidizes into CO2 over a period of 9 - 15 years.

Carozza et al (2011) find that natural global warming occurred in 2 stages: First, global warming of 3 ° to 9 ° C accompanied by a large bolus of organic carbon released to the atmosphere through the burning of terrestrial biomass (Kurtz et al, 2003) over approximately a 50 - year period; second, a catastrophic release of methane hydrate from sediment, followed by the oxidation of a part of this methane gas in the water column and the escape of the remaining CH4 to the atmosphere over a 50 - year period.

Based upon eight (8) joint Russian / American scientific expeditions into the Arctic under the aegis of the International Arctic Research Centre at the University Alaska Fairbanks, methane fields of a breathtakingly fantastic scale have been discovered with plumes over a half - mile wide spewing methane directly into the atmosphere in concentrations 100 times higher than normal.

According to the U.S. Environmental Protection Agency, the greenhouse gas methane is highly efficient at trapping heat in the atmosphere and a significant contributor to global warming, over 80 times more potent than carbon dioxide.

The Earth's climate is predicted to change over time, in part because human activities are altering the chemical composition of the atmosphere through the buildup of greenhouse gases - primarily carbon dioxide, methane, and nitrous oxide.

A possible glimpse of our future would be the Paleocene - Eocene Thermal Maximum (wikipedia the PETM), when a massive release of methane clathrates or other factors caused the level of CO2 in the atmosphere to rise to 1000ppm or more over a relatively brief period of time (in geological terms).

Methane is roughly 28 times more efficient at trapping heat in the Earth's atmosphere over a 100 - year time frame, and current levels of methane in the atmosphere are higher than at any point in the past 2,000Methane is roughly 28 times more efficient at trapping heat in the Earth's atmosphere over a 100 - year time frame, and current levels of methane in the atmosphere are higher than at any point in the past 2,000methane in the atmosphere are higher than at any point in the past 2,000 years.

Unfortunately, I believe that the rest of the world on average will have higher methane leakage rates from the hydrofracking and transmission operations than for those in the USA; which I believe, will significantly increase methane concentrations in the atmosphere over the next several decades.

The methane in the atmosphere is coming from locations that can be, er, located, and quantified over time.

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.

«[Howarth et al.'s] analysis is seriously flawed in that they significantly overestimate the fugitive emissions associated with unconventional gas extraction, undervalue the contribution of «green technologies» to reducing those emissions to a level approaching that of conventional gas, base their comparison between gas and coal on heat rather than electricity generation (almost the sole use of coal), and assume a time interval over which to compute the relative climate impact of gas compared to coal that does not capture the contrast between the long residence time of CO2 and the short residence time of methane in the atmosphere.»

This is because over the past three years, hundreds of new scientific field accounts of global warming's impacts, as well as improved peer - reviewed analyses of global warming itself in both the deep past and the very near future, have depicted earth's atmosphere as far more «sensitive» to the invisible CO2, methane and other human - sourced greenhouse gases than had been hoped.

Carozza et al (2011) find that natural global warming occurred in 2 stages: First, global warming of 3 ° to 9 ° C accompanied by a large bolus of organic carbon released to the atmosphere through the burning of terrestrial biomass (Kurtz et al, 2003) over approximately a 50 - year period; second, a catastrophic release of methane hydrate from sediment, followed by the oxidation of a part of this methane gas in the water column and the escape of the remaining CH4 to the atmosphere over a 50 - year period.

For more information, go to Fracking and air pollution According to the study conducted by professor Robert W. Howarth of Cornell University, «3.6 % to 7.9 % of the methane from shale - gas production escapes to the atmosphere in venting and leaks over the lifetime of a well.»

Methane has a relatively short life in the atmosphere where it oxidizes into CO2 over a period of 9 — 15 years.

Reaching 400 ppm CO2 in the atmosphere is inching ever closer to the tipping point when methane takes over and kicks global warming into high gear.

The new analysis led by Wecht took a broader look, by using satellite monitoring of methane gas levels in the atmosphere over the United States.

The second factor is the insulating effect of the atmosphere of which well over 90 % results from atmospheric water in the form of clouds and water vapour with the remaining 10 % due primarily from CO2 and ozone with just a slightly detectable effect from methane and a trivial effect from all the other gases named in tyhe Kyoto Accord that is so small it can't even be detected on measurements of the Earth's radiative spectrum.

Methane is a potent greenhouse gas that is 25 times more efficient in trapping heat in the atmosphere compared to carbon dioxide over a period of 100 years.

Dr Gauci told us that the authors had made an «enormous leap» assuming that the entire 50 billion tonnes of frozen methane trapped in ocean sediments would end up in the atmosphere over a ten - year period.

Schmidt: What we've been doing in the last 150 years is we've been increasing the amount of greenhouse gasses in the atmosphere — over 40 % in terms of CO2, we've more than doubled the amount of methane, which is another greenhouse gas, and the signatures of those changes are very very clear, all the way through the system.

Following scientific scrutiny over these figures, tests were carried out at various fracking sites across the US to find the true extent of leakages and ACTUAL DATA showed that in some places a deadly amount of up to 17 % of extracted methane was being leaked into the atmosphere.

This methane increases the GHG effect by 0.9 parts per million over the present 400 parts per million of CO2 now in the atmosphere.

The permafrost of the world's largest peat bog, in West Siberia, 10 contains some 70 billion metric tons of methane — equal to about 16 percent of all the carbon added to the atmosphere from fossil fuel combustion, land - use changes, and cement manufacture over the course of the past 150 years (from 1850 to 2000).7

Since methane has a much shorter residence time in the atmosphere than carbon dioxide, but has a greater warming potential over that time, the use of a 20 - year time frame makes methane seem more serious than if a timeframe of 100 years or longer is used.

If it escapes into the atmosphere instead, methane acts as a potent greenhouse gas — in fact, it is over 20 times more effective at trapping heat than carbon dioxide.

Methane has a restricted lifetime in the atmosphere, measured in decades, but while present in the air it has a greenhouse effect some 25 times that of CO2 over a 100 - year period and higher values over shorter periods.

RealClimate is wonderful, and an excellent source of reliable information.As I've said before, methane is an extremely dangerous component to global warming.Comment # 20 is correct.There is a sharp melting point to frozen methane.A huge increase in the release of methane could happen within the next 50 years.At what point in the Earth's temperature rise and the rise of co2 would a huge methane melt occur?No one has answered that definitive issue.If I ask you all at what point would huge amounts of extra methane start melting, i.e at what temperature rise of the ocean near the Artic methane ice deposits would the methane melt, or at what point in the rise of co2 concentrations in the atmosphere would the methane melt, I believe that no one could currently tell me the actual answer as to where the sharp melting point exists.Of course, once that tipping point has been reached, and billions of tons of methane outgass from what had been locked stores of methane, locked away for an eternity, it is exactly the same as the burning of stored fossil fuels which have been stored for an eternity as well.And even though methane does not have as long a life as co2, while it is around in the air it can cause other tipping points, i.e. permafrost melting, to arrive much sooner.I will reiterate what I've said before on this and other sites.Methane is a hugely underreported, underestimated risk.How about RealClimate attempts to model exactly what would happen to other tipping points, such as the melting permafrost, if indeed a huge increase in the melting of the methal hydrate ice WERE to occur within the next 50 years.My amateur guess is that the huge, albeit temporary, increase in methane over even three or four decades might push other relevent tipping points to arrive much, much, sooner than they normally would, thereby vastly incresing negative feedback mechanisms.We KNOW that quick, huge, changes occured in the Earth's climate in the past.See other relevent posts in the past from Realclimate.Climate often does not change slowly, but undergoes huge, quick, changes periodically, due to negative feedbacks accumulating, and tipping the climate to a quick change.Why should the danger from huge potential methane releases be vievwed with any less trepidation?

It is also a potent greenhouse gas that contributes to climate change: Methane is over 20 times more effective at trapping heat in the atmosphere than carbon dioxide, although it is not as long - lived.

``... modeling and isotopic fingerprinting of ice - core methane do not support such a release to the atmosphere over the last 100,000 years or in the near future,» the report says.

My understanding is that the atmosphere warmed by about 6 degrees C from our current level, and that triggered increasing releases of methane from clathrates in a positive feedback fashion over thousands of years (or was it millions of years??).

In Actuality, air sampling surveys over ESAS yield a calculated annual flux to the atmosphere of 8 Tg C - CH ₄ (Shakhova et al., 2010), a figure 200 x higher than the model estimate (at Year - 1 of this 100 - kyr - scale warming) and equivalent to the methane emissions of the entire world's oceans.

Each year a thicker heat - trapping blanket of fossil fuel pollution — carbon dioxide, methane — is spread over the world's surface, trapping more heat in our atmosphere, and causing global temperatures to soar.