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| Titel |
Global modelling of the carbon monoxide at a regional scale resolution with the ECWMF's Integrated Forecast System |
| VerfasserIn |
S. Massart, J. Flemming, D. Cariolle |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062836
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| Zusammenfassung |
| Carbon monoxide (CO) is one of the most important tropospheric trace gases. In particular
because of enhanced surface concentrations due to the main sources of CO that are
incomplete fossil fuel and biomass burning. And with a lifetime of a few months
CO can serve as a tracer for regional and inter-continental transport of polluted
air.
The chemistry of CO is usually modelled in the Chemical Transport Models (CTMs).
Global CTMs with an horizontal resolution of mostly more than 2° by 2° are useful to study
the inter-continental transport but have a too large resolution for regional studies. Such
studies are based on regional CTMs that have an horizontal resolution of mostly around 0.2°
by 0.2°. But regional CTMs are needless for inter-continental transport. To combine the
strengths of the two approaches, we model the CO chemistry over the Globe within the
European Centre for Medium Range Weather Forecast’s Integrated Forecast System (IFS)
at a T799 resolution (about 0.225° by 0.225° at the equator). As we can afford a
full chemical scheme at such a resolution, we use the linear CO chemical scheme
(LinCO) is an alternative. LinCO derives from the CO continuity equation that is
expanded into a Taylor series around the local value of the its mixing ratio and the
temperature.
We will present the results of IFS-LinCO obtained after a two years simulation. Results
include a tropospheric validation again the measurements from the Mozaic dataset and a
stratospheric validation against the measurements from the MLS spatial instrument. The
benefit of the global T799 resolution compared to a more classical T159 one will also be
assessed. |
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