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Atmospheric methane
About: Atmospheric methane is a research topic. Over the lifetime, 2034 publications have been published within this topic receiving 119616 citations.
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TL;DR: In this article, the authors measured the concentration and emission of methane in typical saltmarsh soils (Salic Fluvisols) and humus-rich saltmarshes (Thionic fluvisols), from the German North Sea coast, and measured the methane production rates of the latter.
Abstract: Temperate saltmarshes are a potential source of atmospheric methane. We have measured the concentration and emission of methane in typical saltmarsh soils (Salic Fluvisols) and humus-rich saltmarsh soils (Thionic Fluvisols) from the German North Sea coast. We also measured the methane production rates of the latter. The methane content of typical saltmarsh soils reached 12.0 mmol 1 -1 , although values of 1-4 μmol 1 -1 were usual. The sulphate concentrations of the pore-water were about 10 mM, which means sulphate reduction is not limited and methanogenesis would be suppressed. Methane concentrations were generally largest in summer. Independent of the redox potential and the degree of soil development, methane concentrations were smallest in those soils poorest in humus. Methane emission rates were almost zero. In the humus-rich saltmarsh soils, methane concentrations were roughly a thousand times larger than those in typical saltmarsh soils, reaching values of 23 mmol 1 -1 . The sulphate concentrations of the pore-water were often less than 1 mM, indicating limited sulphate reduction. Methane production was up to 80 μg cm -3 day -1 and was not inhibited when we added sulphate. Methane emission rates reached up to 190 μg m -2 day -1 in summer, with values up to 20 μg m -2 day -1 at other times. The two kinds of saltmarsh soil behave quite differently: the typical saltmarsh soils act as a sink for methane; the humus-rich saltmarsh soils are a source.
35 citations
TL;DR: In this paper, methods for estimating the change in atmospheric concentration of methane, and for predicting its global-warming effect, are described, and Influences of some of the suggested emission control policies are also discussed.
34 citations
TL;DR: Overall, this study showed a sign of atmospheric methane uptake with increase growth potential and yield of paddy cultivation using methanotroph consortium.
34 citations
01 Jan 2000
TL;DR: In the last 200 years, anthropogenic activities such as rice cultivation, animal production, fossil fuel burning and waste management have resulted in a dramatic increase of the atmospheric CH4 concentration during the last 20 years.
Abstract: Methane is a greenhouse gas contributing about 19% to the enhanced greenhouse effect (IPCC, 1994). Anthropogenic activities, such as rice cultivation, animal production, fossil fuel burning and waste management have resulted in a dramatic increase of the atmospheric CH4 concentration during the last 200 years. Its actual concentration is 1.72 ppmv, currently increasing at a rate of 0.6–0.8% per year (Houghton et al.,1996).
34 citations
TL;DR: In this paper, the authors examined the stability of clathrate hydrates at low temperature and low pressure in the conditions prevailing in the atmosphere and at the surface of Mars and found that the proportion of methane in the hydrate is from one tenth to one third of the composition of the gas phase, depending on the crystallographic structure which is assumed to be formed.
34 citations