The concentration of methane in the atmosphere was measured from 1979 through 1983 to establish the worldwide background mixing ratios. Sampling sites were located from Alaska (71 N) to Chile (54 S). An increase in the average worldwide methane mixing ratio from about 1.55 ppmv to about ...
Recovery from a large input of atmospheric CO2from burning fossil fuels will result in an effective lifetime of tens of thousands of years (Archer, 2005). Methane has anatmospheric lifetimeof 12 to 15 years. The methane is degraded to water and CO2by chemical reactions in the atmosphere.Nitr...
Being the major component of the biosphere, forest produces formic and acetic acid directly in plant growth8,9,10, dominating the source of primary biogenic emission11. It also generates a variety of non-methane volatile organic compounds(VOCs), mostly isoprene12, a short-lived and most ...
Past records of atmospheric methane (CH4) abundance/isotope composition may provide a substantial insight on C exchanges in the Earth System (ES). When simulated in the climate models, CH4 helps to identify climate parameters transitions via triggering of its different (natural) sources, with a pr...
Measurements of these gases were taken with optimized instruments in the field at a frequency of about 1 sample/hr. Toward the end of the present project methane measurements were added to the program. The final report deals with the research of the Oregon Graduate Institute (OGI) as part of...
Intrinsic lifetime of metastable excited C4H2: implications for the photochemistry of C4H2 in Titan's atmosphere A better understanding of the complex organic chemistry occurring in the methane-rich atmosphere of Titan can be achieved by comparing observational data w... V.,Vuitton,and,... - 《...
Here we compare and contrast these recent observations (see Methods for details about the instrumentation) with results from two atmosphere-climate models using a range of spatial and temporal resolutions. Based on this dataset, we examine the validity of conclusions drawn in earlier model-flight ...
Design/methodology/approach – The paper explores the potential that control of short-lived greenhouse gases such as methane, tropospheric ozone, and soot could have, in addition to steep cutbacks in industrialized nations, to both mitigate global warming and overcome political stalemate in the ...
The passivation after etching was realised via immersion in a superacid (non-aqueous solution of bis(trifluoromethane)sulfonimide (TFSI) in dichloroethane (DCE)). This treatment allows for a most direct comparison of the material quality as it provides an effective surface passivation with negligible...
(Supplementary Fig.4). This observation may be linked to the combination of reduced marine biogenic SO42−emissions during glacial times and the variable uptake and neutralization of acidic SO42−aerosol on mineral dust particles in the atmosphere. This neutralization reaction is dependent on the...