Bipolar carbon and hydrogen isotope constraints on the Holocene methane budget
نویسندگان
چکیده
منابع مشابه
Constraints on the late holocene anthropogenic contribution to the atmospheric methane budget.
The origin of the late preindustrial Holocene (LPIH) increase in atmospheric methane concentrations has been much debated. Hypotheses invoking changes in solely anthropogenic sources or solely natural sources have been proposed to explain the increase in concentrations. Here two high-resolution, high-precision ice core methane concentration records from Greenland and Antarctica are presented an...
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We describe a continuous-flow isotope ratio mass spectrometry (CF-IRMS) technique for high-precision δD and δ13C measurements of atmospheric methane on 40 mL air samples. CH4 is separated from other air components by utilizing purely physical processes based on temperature, time and mechanical valve switching. Chemical agents are avoided. Trace amounts of interfering compounds can be separated ...
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The hydrogen isotope ratio (D/H) is commonly used to reconstruct the chemical processes at the origin of water and organic compounds in the early solar system. On the one hand, the large enrichments in deuterium of the insoluble organic matter (IOM) isolated from the carbonaceous meteorites are interpreted as a heritage of the interstellar medium or resulting from ion-molecule reactions taking ...
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The role of nickel as catalyst on the conversion of methane and ethylene in a gas phase flow reactor in the absence of oxygen is studied. In this study, nickel in its different forms is used as catalyst. The role of pressure, flow rate, and temperature on the conversion of feed gases is investigated. The experiments have been carried out in the presence and absence of the catalysts to measure t...
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Centennial evolution of the atmospheric methane budget: what do the carbon isotopes tell us? K. R. Lassey, D. M. Etheridge, D. C. Lowe, A. M. Smith, and D. F. Ferretti National Institute of Water and Atmospheric Research, P.O. Box 14-901, Wellington, New Zealand CSIRO Marine and Atmospheric Research, PMB 1, Aspendale Vic. 3195, Australia Australian Nuclear Science and Technology Organisation, P...
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ژورنال
عنوان ژورنال: Biogeosciences
سال: 2018
ISSN: 1726-4189
DOI: 10.5194/bg-15-7155-2018