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| Titel |
Representation of tropical deep convection in atmospheric models – Part 2: Tracer transport |
| VerfasserIn |
C. R. Hoyle, V. Marecal, M. R. Russo, G. Allen, J. Arteta, C. Chemel, M. P. Chipperfield, F. D'Amato, O. Dessens, W. Feng, J. F. Hamilton, N. R. P. Harris, J. S. Hosking, A. C. Lewis, O. Morgenstern, T. Peter, J. A. Pyle, T. Reddmann, N. A. D. Richards, P. J. Telford, W. Tian, S. Viciani, A. Volz-Thomas, O. Wild, X. Yang, G. Zeng |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 15 ; Nr. 11, no. 15 (2011-08-09), S.8103-8131 |
| Datensatznummer |
250009994
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| Publikation (Nr.) |
 copernicus.org/acp-11-8103-2011.pdf |
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| Zusammenfassung |
| The tropical transport processes of 14 different models or model versions
were compared, within the framework of the SCOUT-O3 (Stratospheric-Climate
Links with Emphasis on the Upper Troposphere and Lower Stratosphere) project.
The tested models range from the regional to the global scale, and include
numerical weather prediction (NWP), chemical transport, and chemistry-climate
models. Idealised tracers were used in order to prevent the model's chemistry
schemes from influencing the results substantially, so that the effects of
modelled transport could be isolated. We find large differences in the
vertical transport of very short-lived tracers (with a lifetime of 6 h)
within the tropical troposphere. Peak convective outflow altitudes range from
around 300 hPa to almost 100 hPa among the different models, and the upper
tropospheric tracer mixing ratios differ by up to an order of magnitude. The
timing of convective events is found to be different between the models, even
among those which source their forcing data from the same NWP model (ECMWF).
The differences are less pronounced for longer lived tracers, however they
could have implications for modelling the halogen burden of the lowermost
stratosphere through transport of species such as bromoform, or short-lived
hydrocarbons into the lowermost stratosphere. The modelled tracer profiles
are strongly influenced by the convective transport parameterisations, and
different boundary layer mixing parameterisations also have a large impact on
the modelled tracer profiles. Preferential locations for rapid transport from
the surface into the upper troposphere are similar in all models, and are
mostly concentrated over the western Pacific, the Maritime Continent and the
Indian Ocean. In contrast, models do not indicate that upward transport is
highest over western Africa. |
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