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| Titel |
A Lagrangian analysis of the impact of transport and transformation on the ozone stratification observed in the free troposphere during the ESCOMPTE campaign |
| VerfasserIn |
A. Colette, G. Ancellet, L. Menut, S. R. Arnold |
| 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 ; 6, no. 11 ; Nr. 6, no. 11 (2006-08-25), S.3487-3503 |
| Datensatznummer |
250004067
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| Publikation (Nr.) |
 copernicus.org/acp-6-3487-2006.pdf |
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| Zusammenfassung |
| The ozone variability observed by tropospheric ozone lidars during the
ESCOMPTE campaign is analyzed by means of a hybrid-Lagrangian modeling
study. Transport processes responsible for the formation of ozone-rich
layers are identified using a semi-Lagrangian analysis of mesoscale
simulations to identify the planetary boundary layer (PBL) footprint in the
free troposphere. High ozone concentrations are related to polluted air
masses exported from the Iberian PBL. The chemical composition of air masses
coming from the PBL and transported in the free troposphere is evaluated
using a Lagrangian chemistry model. The initial concentrations are provided
by a model of chemistry and transport. Different scenarios are tested for
the initial conditions and for the impact of mixing with background air in
order to perform a quantitative comparison with the lidar observations. For
this meteorological situation, the characteristic mixing time is of the
order of 2 to 6 days depending on the initial conditions. Ozone is produced
in the free troposphere within most air masses exported from the Iberian PBL
at an average rate of 0.2 ppbv h−1, with a maximum ozone production of
0.4 ppbv h−1. Transport processes from the PBL are responsible for an
increase of 13.3 ppbv of ozone concentrations in the free troposphere compared to
background levels; about 45% of this increase is attributed to in situ production
during the transport rather than direct export of ozone. |
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