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A plausible hydrological scenario for the Bølling-Allerød atmospheric methane increase
- Kalin, Robert M., Jirikowic, John L.
- TheHolocene 1996 v.6 no.1 pp. 111-118
- carbon, carbon cycle, glaciation, groundwater, heat, methane, models, oxidation, paleosolic soil types, photochemistry, radionuclides, sediments
- The glacial record has shown that atmospheric methane concentrations have fluctuated in the past, particularly during the Bølling-Allerød interstadial. We used an inverse photochemical carbon- cycle model to interpret the magnitude of effect that glacial-interglacial atmospheric methane variations have on the global carbon cycle. The results of this modelling suggest that an observed variation in atmospheric ¹⁴C during this time period may be the result of oxidation of the increased atmospheric methane. We re-examine methane clathrate in palaeosols as a potential source of the methane, and the influence of deglaciation and subsequent heat transport from advecting groundwater in these sediments may be a plausible mechanism by which atmospheric CH4 concentrations abruptly increased during the Bølling-Allerød.