Sentences with phrase «dissolved methane»
"Dissolved methane" refers to methane gas that has mixed with a liquid, such as water, and becomes a part of it. Full definition
At earlier sites we had found elevated levels of dissolved methane.
realclimate.org
And I assume from the article that if the methane hydrate deposit is melting then the bottom water will have a high level of dissolved methane.
Study finds «no significant correlation between dissolved methane concentrations in groundwater and proximity to nearby oil / gas wells.»
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.
The study uses four statistical approaches, which come to the same conclusion: «there is no significant correlation between dissolved methane concentrations in groundwater and proximity to nearby oil / gas wells.»
Because little dissolved methane shows up in the overlying ocean, scientists used to surmise that microbes inhabiting the ocean floor were sopping up any methane that escaped from the ice and transforming it into carbon dioxide.
Previous Pluto observations have detected a surface of nitrogen ice with dissolved methane ice dissolved in nitrogen ice.
«Our results show that even among baseline groundwater samples collected near existing gas wells, there is no evidence of systematic increased dissolved methane concentrations closer to oil / gas wells.
She found that in anoxic conditions, when there is no oxygen in the bottom layers of the Chesapeake Bay's waters, dissolved methane built up, probably coming from the mud, and when storms mixed up the invisible layers of the Bay's waters, the methane made it to the surface and into the atmosphere.
Here, we show that more than 5000 at - sea observations of dissolved methane demonstrates that greater than 80 % of ESAS bottom waters and greater than 50 % of surface waters are supersaturated with methane regarding to the atmosphere.
The colors indicate dissolved methane concentration.
The clathrates in these deep deposits are thought to have formed in situ from the microbially produced methane, since the δ13C values of clathrate and surrounding dissolved methane are similar.
Kivu, which has never erupted, is not being vented, although local companies do extract dissolved methane from the lake to use for power generation.
In active gas - extraction areas (one or more gas wells within 1 km), average and maximum methane concentrations in drinking - water wells increased with proximity to the nearest gas well and were 19.2 and 64 mg CH4 L - 1 (n = 26), a potential explosion hazard; in contrast, dissolved methane samples in neighboring nonextraction sites (no gas wells within 1 km) within similar geologic formations and hydrogeologic regimes averaged only 1.1 mg L - 1 (P < 0.05; n = 34).
Concentrations of dissolved methane on the Siberian shelf reached 25 times higher than atmospheric saturation, indicating escape of methane from coastal erosion into the atmosphere [Shakhova et al., 2005].
Combined, the results of all four statistical approaches yield a defensible, compelling argument that there is no significant correlation between dissolved methane concentrations in groundwater and proximity to nearby oil / gas wells.»
Average δ13C - CH4 values of dissolved methane in shallow groundwater were significantly less negative for active than for nonactive sites -LRB--37 ± 7 ‰ and -54 ± 11 ‰, respectively; P < 0.0001).
On the distribution of dissolved methane in Davis Strait, North Atlantic Ocean.
Color scales show dissolved methane concentration.
«PFH is ideal for the second step: it dissolves methane, but doesn't react with CH3 • radicals,» explains Ohkubo.
However, when there is no oxygen in the water — as regularly occurs at the bottom of the Chesapeake Bay during the summer time — the microbes can't do their job and dissolved methane is released into the water column and rests there at the bottom.
The lake, which is almost half a kilometre deep in places, is on Rwanda's north - west border with the Democratic Republic of the Congo (see map) and contains a vast reservoir of dissolved methane.
Dissolved methane is not toxic, and drinking water often contains significant background levels of the gas from natural sources.
Top is dissolved methane in deep water.
Bottom is dissolved methane in surface water (Shakhova 2010).
If chemicals were used to dissolve the methane, given the quantities implied, wouldn't there be a massive toxic pollution issue?
Then after this first pulse of decay, plant matter settling on the reservoir's bottom decomposes without oxygen, resulting in a build - up of dissolved methane.
Or could there be a chemical reaction between dissolved methane and oxygen that depletes the oxygen level below that needed to sustain life?
Dissolved methane in shallow groundwater of the Appalachian Basin: Results from the Chesapeake Energy predrilling geochemical database
Dissolved methane is chemically unstable in the oxic water column of the ocean, but it has a lifetime of decades (shorter in high - flux environments)[Valentine et al., 2001], so if the methane is released shallow enough in the ocean, it has a good chance of escaping to the atmosphere.