Sentences with phrase «high methane concentrations in»

High methane concentrations in well - ice - bonded sediments and gas releases suggest that pore - space hydrate may be found at depths as shallow as 119 m. Geochemical and isotopic determinations suggest that the methane hydrate observed in the core hole is biogenic (microbial) in origin.

«The fact that human activity in a watershed leads to high methane concentrations in those rivers and streams underscores yet another reason to pay attention to water quality,» says Stanley.

«The fact that human activity in a watershed leads to high methane concentrations in those rivers and streams underscores yet another reason to pay attention to water quality.

Higher methane concentrations in the atmosphere will accelerate global warming and hasten local changes in the Arctic, speeding up sea - ice retreat, reducing the reflection of solar energy and accelerating the melting of the Greenland ice sheet.

The team is still calculating the CO2 emissions produced by the act of flaming, but believes they're negligible, and preferable to higher methane concentrations in the atmosphere.

Not exact matches

A new peer - reviewed study discredits findings of controversial research claiming that higher concentrations of dissolved methane in domestic water wells can be associated with proximity to nearby gas - producing wells in northeastern Pennsylvania — and it does so using a much larger sampling size and pre-drill baselines.

No random sampling; authors appear to have simply cherry - picked water wells previously known to have high concentrations of methane, although they never actually mention in the report which wells they sampled or where they're located: «Jackson said the study was indeed not random, but that was because they needed homeowners permission to test their water.»

«Methane concentrations in drinking water were much higher if the homeowner was near an active gas well,» explains environmental scientist Robert Jackson of Duke University, who led the study published online May 9 in Proceedings of the National Academy of Sciences.

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

High methane concentrations (reds and yellows) appear during martian summer in localized plumes.

Although the concentration of carbon dioxide in the atmosphere is much higher, at around 385 parts per million, methane is a worry as it is much better than carbon dioxide at locking in heat from solar radiation.

A 2011 study in the Proceedings of the National Academy of Sciences by Jackson and his colleagues documented high concentrations of methane and other hydrocarbons in groundwater close to fracking operations in Pennsylvania and New York.

For example, research in Los Angeles is showing that small methane leaks in homes between the gas meter and heaters and stoves could be leading to higher atmospheric methane concentrations there, he said, whereas other cities may have old, leaking gas pipes.

«The methane concentrations were extraordinarily high, the highest we've seen in ambient samples,» said Blake, who has measured air pollutants across the globe for more than 30 years.

By that time, the methane plume had begun to disperse into a larger volume of water, but Joye's team continued to find methane concentrations up to 1,000 times higher than prespill levels in some places.

Using a high - resolution spectrograph at the Infrared Telescope Facility in Hawaii and at the Gemini South Telescope in Chile, a team led by Michael Mumma of the NASA Goddard Space Flight Center detected methane concentrations in excess of 250 ppbv, varying over the planet and perhaps over time.

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.

Shakhova et al (2013) show shipboard measurements of methane concentrations in the air above the ESAS that are almost twice as high as the global average (which is already twice as high as preindustrial).

Certainly high methane concentrations indicate emission fluxes, but it's not straightforward to know how significant that flux is in the global budget.

Northern hemisphere concentrations are a bit higher than they are in the Southern hemisphere (here), but the magnitude of the difference is small enough to support the conclusion from the methane budget that tropical wetlands, which don't generate much interhemispheric gradient, are a dominant natural source (Kirschke et al 2013).

Aircraft measurements published last year also showed plumes of high methane concentration over the Arctic ocean (Kort et al 2012), especially in the surface boundary layer.

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.

So far our data do not show any evidence for rapid water contamination, as we do not see evidence of these diluted brines (type D water) associated with distance to natural gas wells (the Osborn 2011 paper) in wells where higher methane concentrations were observed.

What I think you mean is that if we get CO2 levels high enough to cause a serious problem, we can't just stop emitting and hope the concentration will drop in time to make a difference, whereas with methane, it decays fast enough that we need to worry more about the decay products than about methane itself.

Look at the concentration numbers there at a known ground level source, then look again at that methane emergency blog and the concentrations reported for up high in the polar atmosphere.

Re inline response in # 6 Then there is a problem with our global methane monitoring system because it shows higher concentrations of methane in north.

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.

Air near the bottom of the crater contained unusually high concentrations of methane — up to 9.6 % — in tests conducted at the site on 16 July, says Andrei Plekhanov, an archaeologist at the Scientific Centre of Arctic Studies in Salekhard, Russia.

«Methane migration through the 1 - to 2 - km - thick geological formations that overlie the Marcellus and Utica shales is less likely as a mechanism for methane contamination than leaky well casings, but might be possible due to both the extensive fracture systems reported for these formations and the many older, uncased wells drilled and abandoned over the last century and a half in Pennsylvania and New York [where they did their study]... More research is needed across this and other regions to determine the mechanism (s) controlling the higher methane concentrations we observed.Methane migration through the 1 - to 2 - km - thick geological formations that overlie the Marcellus and Utica shales is less likely as a mechanism for methane contamination than leaky well casings, but might be possible due to both the extensive fracture systems reported for these formations and the many older, uncased wells drilled and abandoned over the last century and a half in Pennsylvania and New York [where they did their study]... More research is needed across this and other regions to determine the mechanism (s) controlling the higher methane concentrations we observed.methane contamination than leaky well casings, but might be possible due to both the extensive fracture systems reported for these formations and the many older, uncased wells drilled and abandoned over the last century and a half in Pennsylvania and New York [where they did their study]... More research is needed across this and other regions to determine the mechanism (s) controlling the higher methane concentrations we observed.methane concentrations we observed.»

NATURALLY OCCURRING METHANE CAPTURE — Methane emissions may occur from land areas where coal or other high concentrations of un-extracted fossil fuels are present underground, resulting in a naturally occurring source of greenhouse gas (GHG) emiMETHANE CAPTURE — Methane emissions may occur from land areas where coal or other high concentrations of un-extracted fossil fuels are present underground, resulting in a naturally occurring source of greenhouse gas (GHG) emiMethane emissions may occur from land areas where coal or other high concentrations of un-extracted fossil fuels are present underground, resulting in a naturally occurring source of greenhouse gas (GHG) emissions.

And there they found high readings of methane at the hole's base — in the range of 10 % concentration, which is a very explosive level for the gas.

These «methane chimneys» sometimes contained concentrations of the gas 100 times higher than background levels and were so large that clouds of gas bubbles were detected «rising up through the water column,» Orjan Gustafsson of the Department of Applied Environmental Science at Stockholm University and the co-leader of the expedition, said in an interview.

Methane that escapes the sea is generally a small fraction of methane that is released from clathrates at the sea floor, though if the concentration rose high enough so much could make it to the atmosphere that the impact of methane as a GHG in air (before it devolves to CO2 in air) overwhelmed the negative effects of methane decomposing to CO2 in the oMethane that escapes the sea is generally a small fraction of methane that is released from clathrates at the sea floor, though if the concentration rose high enough so much could make it to the atmosphere that the impact of methane as a GHG in air (before it devolves to CO2 in air) overwhelmed the negative effects of methane decomposing to CO2 in the omethane that is released from clathrates at the sea floor, though if the concentration rose high enough so much could make it to the atmosphere that the impact of methane as a GHG in air (before it devolves to CO2 in air) overwhelmed the negative effects of methane decomposing to CO2 in the omethane as a GHG in air (before it devolves to CO2 in air) overwhelmed the negative effects of methane decomposing to CO2 in the omethane decomposing to CO2 in the oceans..

Methane and especially water vapour are in far higher concentrations are are far more likely to have a blanket effect.

Methane concentrations inside the trees ran as high as 15,000 parts per million as compared with fewer than 2 parts per million in normal air.

Such a strong acceleration of methane degassing from the Arctic would result in measurably higher concentrations of methane in the high northern latitudes.

Stocks Under conditions of high pressure, high methane concentration, and low temperature, water and methane can combine to form icy solids known as methane hydrates or clathrates in ocean sediments.

«Ship - based observations show that methane concentrations in the air above the East Siberian Sea Shelf are nearly twice as high as the global average... Layers of sediment below the permafrost slowly emit methane gas, and this gas has been trapped for millennia beneath the permafrost.

Naturally Occurring Methane Capture Carbon Offsets — Methane emissions may occur from land areas where coal or other high concentrations of un-extracted fossil fuels are present underground, resulting in a naturally occurring source of GHG emissions.

Researchers at the Yale School of Forestry and Environmental Studies have discovered that trees right here in Connecticut that are diseased by fungi can emit high concentrations of methane — a greenhouse gas that plays a role in climate change.

«[Methane] gas hydrate at high concentrations in sand reservoirs represent the best combination for production using existing technologies.»

[47] While performing research in July in plumes in the East Siberian Arctic Ocean, Gustafsson and Vonk were surprised by the high concentration of methane.

However, when nitrogen oxides are present in high concentrations as a result of human - caused pollution, VOCs react with these pollutants to produce more ozone and methane.

Methane concentrations were 17 - times higher on average (19.2 mg CH4 L - 1) in shallow wells from active drilling and extraction areas than in wells from nonactive areas (1.1 mg L - 1 on average; P < 0.05; Fig. 3 and Table 1).

Methane concentrations were detected generally in 51 of 60 drinking - water wells (85 %) across the region, regardless of gas industry operations, but concentrations were substantially higher closer to natural - gas wells (Fig. 3).

Consequently, the high methane concentrations with distinct positive δ13C - CH4 and δ2H - CH4 values in the shallow groundwater from active areas could in principle reflect the transport of a deep methane source associated with gas drilling and hydraulic - fracturing activities.

The solution to this «faint young Sun paradox» appears to lie in the presence of unusually high concentrations of greenhouse gases at the time, particularly methane and carbon dioxide.