![]() The increase in CH 4 burden due to halogens (up to 700 Tg or 8% by 2100) is equivalent to the observed atmospheric CH 4 growth during the last three to four decades. This increase in CH 4 lifetime helps to reduce the gap between models and observations and results in a greater burden and radiative forcing during this century. This effect arises from significant halogen-mediated decrease, mainly by iodine and bromine, in OH-driven CH 4 loss that surpasses the direct Cl-induced CH 4 sink. Here, we demonstrate that reactive halogen chemistry increases the global CH 4 lifetime by 6–9% during the 21st century. However, such an effect of atmospheric halogens is not considered in existing climate projections of CH 4 burden and radiative forcing. Reactive halogens substantially perturb the budget of tropospheric OH, the main CH 4 loss. ![]() ![]() Current chemistry-climate models tend to underestimate the lifetime of CH 4, suggesting uncertainties in its sources and sinks. ![]() CH 4 is the most abundant reactive greenhouse gas and a complete understanding of its atmospheric fate is needed to formulate mitigation policies. ![]()
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