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| Titel |
On interpreting studies of tracer transport by deep cumulus convection and its effects on atmospheric chemistry |
| VerfasserIn |
M. G. Lawrence, M. Salzmann |
| 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 ; 8, no. 20 ; Nr. 8, no. 20 (2008-10-21), S.6037-6050 |
| Datensatznummer |
250006412
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| Publikation (Nr.) |
 copernicus.org/acp-8-6037-2008.pdf |
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| Zusammenfassung |
| Global chemistry-transport models (CTMs) and chemistry-GCMs (CGCMs)
generally simulate vertical tracer transport by deep convection
separately from the advective transport by the mean winds,
even though a component of the mean transport, for instance in
the Hadley and Walker cells, occurs in deep convective updrafts. This
split treatment of vertical transport has various implications for CTM
simulations. In particular, it has led to a misinterpretation of
several sensitivity simulations in previous studies in which the
parameterized convective transport of one or more tracers is
neglected. We describe this issue in terms of simulated fluxes and
fractions of these fluxes representing various physical and
non-physical processes. We then show that there is a significant
overlap between the convective and large-scale mean advective vertical
air mass fluxes in the CTM MATCH, and discuss the implications which
this has for interpreting previous and future sensitivity simulations,
as well as briefly noting other related implications such as numerical
diffusion. |
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