Atmos. Chem. Phys. Discuss., 10, 10839-10863, 2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Options to accelerate ozone recovery:ozone and climate benefits
J. S. Daniel1, E. L. Fleming2,3, R. W. Portmann1, G. J. M. Velders4, C. H. Jackman2, and A. R. Ravishankara1
1National Oceanic and Atmospheric Administration, Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO 80305, USA
2NASA Goddard Space Flight Center, Greenbelt, Maryland, 20771, USA
3Science Systems and Applications, Inc., Lanham, MD 20706, USA
4Netherlands Environmental Assessment Agency, 3720 AH Bilthoven, The Netherlands

Abstract. Hypothetical reductions in future emissions of ozone-depleting substances (ODSs), including N2O, are evaluated in terms of effects on equivalent effective stratospheric chlorine (EESC), globally-averaged total column ozone, and radiative forcing through 2100. Due to the established success of the Montreal Protocol, these actions can have only a fraction of the impact that regulations already in force have had. If all anthropogenic ODS emissions were halted beginning in 2011, ozone is calculated to be higher by about 1–2{%} during the period 2030–2100 compared to a case of no additional ODS restrictions. Radiative forcing by 2100 would be about 0.23 W/m2 lower due to the elimination of N2O emissions and about 0.005 W/m2 lower due to destruction of the chlorofluorocarbon (CFC) bank. The ability of EESC to be a suitable metric for total ozone is also quantified. Responding to the recent suggestion that N2O should be considered an ODS, we provide an approach to incorporate N2O into the EESC formulation.

Citation: Daniel, J. S., Fleming, E. L., Portmann, R. W., Velders, G. J. M., Jackman, C. H., and Ravishankara, A. R.: Options to accelerate ozone recovery:ozone and climate benefits, Atmos. Chem. Phys. Discuss., 10, 10839-10863, doi:10.5194/acpd-10-10839-2010, 2010.
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