Seperate CO and VOC influences on methane lifetime

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In AerChemMIP, the piClim-VOC experiment included changes from CO. It was therefore not possible to separate the effects of CO and VOC on methane lifetime or ozone forcing. For ozone, the CO/VOC split from Stevenson et al. 2013 is applied to the AerChemMIP data. This could also be done for CH4 lifetime (table 7 in Stevenson et al). Currently the CO effect on methane lifetime is zero, and all changes are attributed to VOC.