Sentences with phrase «high methane concentrations»

And the structures that remain apparently release methane gas for some time — as is evidenced by continued high methane concentrations found at crater sites and by observed emissions from crater lake surfaces.

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.

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.

Note the change of the color scale: To consider the approx. 30 ppb higher methane concentrations during 2010 - 2011 compared to 2003 - 2004, the color scale has been shifted by 30 ppb for GOSAT compared to SCIAMACHY (click here for GERMAN version):

«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.

«[Professional hydrogeologist John] Conrad also criticized the study for not starting with «baseline tests for the wells they sampled»... «While they point to higher methane concentrations, we don't know what the original water quality was before drilling occurred,» he said.

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

The closer the wells were to the drill sites, the higher the methane concentrations, some of which were above the level that raises alarm at the Department of the Interior.

«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.

In the Yale forest, red maples were found to have the highest methane concentrations while oak, birch, hemlock and pine had lower levels.

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.

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.

More research is needed across this and other regions to determine the mechanism (s) controlling the higher methane concentrations we observed.