The atmospheric CH4 increase since the Last Glacial Maximum. II - Interactions with oxidants

摘要: Results of two studies the effect changing CH4 fluxes on global tropospheric oxidant levels, O3, OH, and H2O2, performed with a multibox photochemical model, are presented. A sensitivity study is conducted by scaling back CH4, CO, NO emissions relative to present-day budget. When ice core record compared calculated abundances, corresponding for preindustrial Holocene (PIH) Last Glacial Maximum (LGM) fairly well-constrained: 175-225 Tg CH/4/yr PIH 100-130 CH4/yr LGM. Specific scenarios CH4/CO/NO selected represent sources The budget taken from an evaluation wetlands other natural sources.