Sentences with phrase «show atmospheric methane»

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.

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

Methane «flying carpet» showing the atmospheric methane amounts as a function of time and latitude.

Not exact matches

However, newer research has shown that GHG emissions such as atmospheric methane have risen rapidly since 2007, according to a 2016 study published in the International Journal of Science.

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.

In the new paper, published in the journal Environmental Research Letters, Höglund - Isaksson estimated global methane emissions from oil and gas systems in over 100 countries over a 32 - year period, using a variety of country - specific data ranging from reported volumes of associated gas to satellite imagery that can show flaring, as well as atmospheric measurements of ethane, a gas which is released along with methane and easier to link more directly to oil and gas activities.

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.

Tests from one to 50 atmospheric pressures showed the Rice compound captured a fifth of its weight in carbon dioxide but no measurable amount of methane, Barron said, and the material did not degrade over many absorption / desorption cycles.

Initial data from the Cassini - Huygens spacecraft, which began exploring the Saturnian system in 2004, show that methane is indeed a minor atmospheric constituent but a very important one, possibly playing a role analogous to that of water vapour in Earth's troposphere.

And others believe clathrates of a whatever kind are already accelerating in their melt rates (which, paradoxically may show up better in atmospheric CO2 than methane since a recent study said 50 % of methane is converted to CO2 via methanogenesis, perhaps helping with the accounting re: last year's massive increase)...

The study shows that during drilling, as much as 34 grams of methane per second were spewing into the air from seven natural gas well pads in southwest Pennsylvania — up to 1,000 times the EPA estimate for methane emissions during drilling, Purdue atmospheric chemistry professor and study lead author Paul Shepson said in a statement.

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.

• The methanetrack.org website has shown significant increases in atmospheric methane concentrations over Antarctica this austral winter (which I believe are due to increases in methane emissions from the Southern Ocean seafloor due to increases in the temperature of bottom water temperatures), and if this trend continues, then the Southern Hemisphere could be a significant source of additional atmospheric methane (this century).

I have seen no instrumental measurements showing a dramatic increase in atmospheric methane, though, but I only have limited access and time to look.

-- Readings from the monitoring stations at Barrow do in fact show huge increases in atmospheric methane levels

It makes the non-CO2 contributions much clearer: Methane now has a more dominant role via its impact on atmospheric chemistry, and other, more traditional pollutants are included that show clearly the connections between air quality and climate.

Methane and carbon dioxide on the rise13 May 2016 Satellite readings show that atmospheric methane and carbon dioxide are continuing to increase despite global efforts to reduce emiMethane and carbon dioxide on the rise13 May 2016 Satellite readings show that atmospheric methane and carbon dioxide are continuing to increase despite global efforts to reduce emimethane and carbon dioxide are continuing to increase despite global efforts to reduce emissions.

On longer timescales, our results show that the decrease in atmospheric methane growth during the 1990s was caused by a decline in anthropogenic emissions.

Research published in Science shows that up to 7 million tons of methane is released annually from the East Siberian Arctic Shelf — a small percentage of total greenhouse gas emissions, but potentially enough to account for recent increases in atmospheric methane levels.

The actual proper quote is «But methane - rich Siberian air (see map of average atmospheric methane levels in January 2016, above) shows no sign of rising any faster than the rest of the world.»