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Volume 17, issue 6
Atmos. Chem. Phys., 17, 3785–3797, 2017
https://doi.org/10.5194/acp-17-3785-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Atmos. Chem. Phys., 17, 3785–3797, 2017
https://doi.org/10.5194/acp-17-3785-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 20 Mar 2017

Research article | 20 Mar 2017

A new time-independent formulation of fractional release

Jennifer Ostermöller et al.
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Bönisch, H., Engel, A., Curtius, J., Birner, Th., and Hoor, P.: Quantifying transport into the lowermost stratosphere using simultaneous in-situ measurements of SF6 and CO2, Atmos. Chem. Phys., 9, 5905–5919, https://doi.org/10.5194/acp-9-5905-2009, 2009.
Carpenter, L. J., Reimann, S., Burkholder, J. B., Clerbaux, C., Hall, B. D., Hossaini, R., Laube, J. C., Yvon-Lewis, S. A., Engel, A., and Montzka, S.: Update on ozone-depleting substances (ODSs) and other gases of interest to the Montreal protocol, Scientific Assessment of Ozone Depletion, 1–1, 2014.
Chipperfield, M., Liang, Q., Abraham, L., Bekki, S., Braesicke, P., Dhomse, S., Di Genova, G., Fleming, E., Hardiman, S., Iachetti, D., Jackman, C., Kinnison, D., Marchand, M., Pitari, G., Rozanov, E., Stenke, A., and Tummon, F.: Model Estimates of Lifetimes, in: SPARC Report on Lifetimes of Stratospheric Ozone-Depleting Substances, Their Replacements, and Related Species, edited by: Ko, M. K. W., Newman, P. A., Reimann, S., and Strahan, S. E., 6, 256 pp., SPARC Office, available at: http://www.sparc-climate.org/publications/sparc-reports/ (last access: 7 March 2017), 2013.
Daniel, J. S., Solomon, S., and Albritton, D. L.: On the evaluation of halocarbon radiative forcing and global warming potentials, J. Geophys. Res.- Atmos., 100, 1271–1285, https://doi.org/10.1029/94JD02516, 1995.
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Short summary
We analysed the temporal evolution of fractional release factors (FRFs) from EMAC model simulations for several halocarbons and nitrous oxide. The current formulation of FRFs yields values that depend on the tropospheric trend of the species. This is a problematic issue for the application of FRF in the calculation of steady-state quantities (e.g. ODP). Including a loss term in the calculation, we develop a new formulation of FRF and find that the time dependence can almost be compensated.
We analysed the temporal evolution of fractional release factors (FRFs) from EMAC model...
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