Sentences with phrase «decreased atmospheric methane»
Light gray bars denote deglaciations (terminations), while the two dark gray bars denote the Younger Dryas and the Younger Dryas - like event during termination III (i.e., decreased atmospheric methane and East Asian Monsoon (higher δ18O).
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Near Titan's surface, about 5 percent of the atmospheric molecules are methane, the fraction decreasing with altitude.
We find that the global methane hydrate inventory decreases by approximately 70 % (35 %) under four times (twice) the atmospheric CO2 concentration and is accompanied by significant global oxygen depletion on a timescale of thousands of years.
The effect of this increase on the growth rate of atmospheric methane has been masked by a coincident decrease in wetland emissions, but atmospheric methane levels may increase in the near future if wetland emissions return to their mean 1990s levels.
On longer timescales, our results show that the decrease in atmospheric methane growth during the 1990s was caused by a decline in anthropogenic emissions.
The discovery in ice core records that atmospheric concentrations of two potent greenhouse gases, carbon dioxide and methane, have decreased during past glacial periods and peaked during interglacials indicates important feedback processes in the Earth system.