Fig3. (a) mass-weighted tropospheric mean OH, (b) CH4 lifetime concerning OH, (c) tropospheric O3, and (d) increasing ERF in UKESM1. In panels (a)–(d), Black circle (BASE scenario), Blue circle (the CH4 LBC remains fixed at 2014 levels), Red circle (CH4 LBC is adjusted to account for the change in CH4 lifetime), Orange circle (changes in emissions of ozone precursors). Green circle (changes in emissions of CH4 and ozone precursors, as well as adjusted CH4 LBCs)​. See N. J. Warwick et al. (2023)​.