Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 4.14: Atmospheric composition and properties predicted using the six SRES Marker-Illustrative scenarios for anthropogenic emissions: A1B (green dashed line), A1T (yellow dash-dotted), A1FI (orange dash-dot-dotted), A2 (red solid), B1 (cyan dashed), B2 (solid dark blue). Abundances prior to year 2000 are taken from observations, and the IS92a scenario computed with current methodology is shown for reference (thin black line). Results are shown for CH4 (ppb), N2O (ppb), tropospheric O3 (DU), HFC-134a (ppt), CF4 (ppt), SF6 (ppt), the lifetime of CH4 (yr), and the global annual mean abundance of tropospheric OH (scaled to year 2000 value). All SRES A1-type scenarios have the same emissions for HFCs, PFCs, and SF6 (appearing a A1B), but the HFC-134a abundances vary because the tropospheric OH values differ affecting its lifetime. The IS92a scenario did not include emissions of PFCs and SF6. For details, see chapter text and tables in Appendix II.

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