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- W4280508927 abstract "Abstract CH 4 is the most abundant reactive greenhouse gas and a complete understanding of its atmospheric fate is needed to formulate mitigation policies. Current chemistry-climate models tend to underestimate the lifetime of CH 4 , suggesting uncertainties in its sources and sinks. Reactive halogens substantially perturb the budget of tropospheric OH, the main CH 4 loss. However, such an effect of atmospheric halogens is not considered in existing climate projections of CH 4 burden and radiative forcing. Here, we demonstrate that reactive halogen chemistry increases the global CH 4 lifetime by 6–9% during the 21st 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. 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. 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. Notably, the halogen-driven enhancement in CH 4 radiative forcing is 0.05 W/m 2 at present and is projected to increase in the future (0.06 W/m 2 by 2100); such enhancement equals ~10% of present-day CH 4 radiative forcing and one-third of N 2 O radiative forcing, the third-largest well-mixed greenhouse gas. Both direct (Cl-driven) and indirect (via OH) impacts of halogens should be included in future CH 4 projections." @default.
- W4280508927 created "2022-05-22" @default.
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- W4280508927 date "2022-05-19" @default.
- W4280508927 modified "2023-10-16" @default.
- W4280508927 title "Reactive halogens increase the global methane lifetime and radiative forcing in the 21st century" @default.
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- W4280508927 doi "https://doi.org/10.1038/s41467-022-30456-8" @default.
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