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| Titel |
Global distribution of CO2 in the Upper Troposphere-Stratosphere |
| VerfasserIn |
Mohamadou Diallo, Bernard Legras, Alain Chédin |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250108519
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| Publikation (Nr.) |
 EGU/EGU2015-8275.pdf |
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| Zusammenfassung |
| The origin of air parcels in the lowermost stratosphere, is strongly affected by the
stratosphere-troposphere exchanges or fast isentropic mixing, in particular occuring in the
shallow branch of the Brewer-Dobson circulation. The Brewer-Dobson circulation can be
diagnosed using the inert feature of CO2. Currently, most of our knowledge of the global
distribution of the atmospheric chemical species, such as CO2, is limited by the uncertainty in
dynamics of transport and the sparseness of in situ concentration measurements. The ability
of chemistry-transport models or Lagrangian transport Models as TRACZILLA or analysed
winds to reproduce the Brewer-Dobson circulation is a pre-requisite for the representation of
transport and distribution of long-lived species as CO2 within the troposphere and
stratosphere. In this study, we investigate the global monthly mean distribution of CO2
derived from our Lagrangian Transport Model,Traczilla driven by the ERA-Interim reanalysis
from European Center for Medium range Weather Forecast (ECMWF) (Fig. 1).
First, we will present the global monthly distribution of mean CO2 derived from
TRACZILLA. We will show the seasonal variability across the vertical distribution, the time
series in the northern hemisphere over 10° of latitudes bins and finally the monthly
averaged vertical profiles of CO2 between the upper troposphere and the stratosphere. |
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