Impacts of the chlorine release mechanism proposed in this work on the atmospheric lifetime of CH₄ and the abundances of O₃ across latitudes 60° S–60° N and L_s 0–360°. The 1D model is driven by MY34 climatological datasets from the MCDv6.1, positioned at longitude 0° E. (a) Ratio of the column lifetime of CH₄ without chlorine chemistry (τ_Control) and the column lifetime with chlorine chemistry (τ_C1 ). (b) Ratio of the O₃ column abundances with chlorine chemistry and without chlorine chemistry at LT = 12:00 h. (c) CH₄ lifetime profiles with (solid) and without (dashed) chlorine chemistry at L_s 251°. (d) O₃ VMR profiles with (solid) and without (dashed) chlorine chemistry at L_s 251° .