Sentences with phrase «showed higher methane»

A nearby circuit showed higher methane upwind of a pad than downwind, indicating a source outside the target area, possibly from nearby mine vents.

The subsequent studies have produced a mixed bag of results, with some showing higher methane emissions than expected, and others lower.

Not exact matches

Meanwhile, researchers were showing that besides soil and water contamination, hog CAFOs emit high volumes of the potent greenhouse gas methane (pound for pound, hog manure produces twice the methane of cattle manure) and ammonia, which has been linked to respiratory ailments.

A US study from 2011 showed high levels of methane in water wells close to shale gas wells, but has been criticised for lacking data on levels of background natural methane in the water.

The ice core data also shows that CO2 and methane levels have been remarkably stable in Antarctica — varying between 300 ppm and 180 ppm — over that entire period and that shifts in levels of these gases took at least 800 years, compared to the roughly 100 years in which humans have increased atmospheric CO2 levels to their present high.

Global methane and ethane emissions from oil production from 1980 to 2012 were far higher than previous estimates show, according to a new study which for the first time takes into account different production management systems and geological conditions around the world.

For the first time, the researchers also showed that higher HTC production temperatures resulted in a significant reduction in emissions of methane (CH4) and ammonia (NH3) and an increase of carbon dioxide and carbon monoxide.

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.

But careful kinetic studies in a flow - through reactor showed that large palladium particles preferentially produced methane while small ones preferred - or had high selectivity toward - carbon monoxide formation.

We were able to show that under [presumed] Enceladus - like conditions and the given environmental parameters, biological methane production did occur in the lab,» and that a «microoorganism from a hydrothermal vent system on Earth could be grown in the presence of [presumed] inhibitors in combination with high pressure.»

Compositional data also show that the surface of Piri Planitia is more enriched in water ice (shown in false colour as blue) than the higher plateaus, which may indicate that Piri Planitia's surface is made of water ice bedrock, just beneath a layer of retreating methane ice.

We find (i) measurements at all scales show that official inventories consistently underestimate actual CH4 [methane] emissions, with the natural gas and oil sectors as important contributors; (ii) many independent experiments suggest that a small number of «super-emitters» could be responsible for a large fraction of leakage; (iii) recent regional atmospheric studies with very high emissions rates are unlikely to be representative of typical natural gas system leakage rates; and (iv) assessments using 100 - year impact indicators show system - wide leakage is unlikely to be large enough to negate climate benefits of coal - to - natural gas substitution.

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).

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.

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.

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.

A new NASA - sponsored study shows that global methane emissions produced by livestock are 11 percent higher than estimates made last decade.

But our study clearly shows that the lower methane concentration allowed for a higher OH concentration, and thus more rapid oxidation of methane.»

The cores show that modern levels of carbon dioxide, methane, and nitrous oxide levels are the highest they have ever been.

In addition, studies show that methane emissions are higher for hydraulic fracturing of shale gas than conventional natural gas production.

Semiletov's work during the 1990s showed, among other things, that the amount of methane being emitted from terrestrial sources decreased at higher latitudes.

Yet the paper shows that the consequences of that methane molecule will last for more than a millennium, causing the the seas to rise higher and higher all the time.

«We show that methane mixing ratios greater than 10 - 3 are potentially biogenic, whereas those exceeding 10 - 2 are likely biogenic due to the difficulty in maintaining large abiotic methane fluxes to support high methane levels in anoxic atmospheres,» the researchers wrote in their study.

Researchers noted during a webinar presentation of the study's preliminary findings in July 2017 that it was the first time long - term continuous sampling of methane from natural gas activities had occurred, and that most existing studies that use aircraft data only sample for a limited number of days, usually only one to two, and often show a higher leakage rate.

A string of studies by the National Oceanic and Atmospheric Administration show that the core ingredient in natural gas, methane, is leaking at rates far higher than previously suspected.

«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.

New research shows that the amount of carbon stored in frozen soils at high latitudes is double previous estimates and could, if emitted as carbon dioxide and methane, lead to a significant increase in global temperatures by the end of this century.

The other study from this year on this there: Back in January a lifecycle analysis of natural gas by the EPA showed that in fracking operations methane emissions were up to 9,000 times higher than previously reported.