Etude expérimentale et numérique de l'influence des processus de
transport depuis la couche-limite sur la variabilité et le bilan d'ozone
troposphérique.

Abstract : Closing the tropospheric ozone budget requires a better understanding of
the role of transport processes from the major reservoirs: the planetary
boundary layer and the stratosphere. Case studies lead to the
identification of mechanisms involved as well as their efficiency.
However, their global impact on the budget must be addressed on a
climatological basis. The defense is thus divided in two parts.
First, we present case studies based on ozone LIDAR measurements
performed during the ESCOMPTE campaign. This work consists in a data
analysis investigation by means of a hybrid - lagrangian study
involving: global meteorological analyses, lagrangian particle
dispersion computation, and mesoscale, chemistry - transport, and
lagrangian photochemistry modeling. Our aim is to document the amount of
observed ozone variability related to transport processes and, when
appropriate, to infer the role of tropospheric photochemical production.
Second, we propose a climatological analysis of the respective impact of
transport from the boundary-layer and from the tropopause region on the
tropospheric ozone budget. A multivariate analysis is presented and
compared to a trajectography approach. Once validated, this algorithm is
applied to the whole database of ozone profiles collected above Europe
during the past 30 years in order to discuss the seasonal, geographical
and temporal variability of transport processes as well as their impact
on the tropospheric ozone budget. The variability of turbulent mixing
and its impact on the persistence of tropospheric layers will also be
discussed.
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https://tel.archives-ouvertes.fr/tel-00011438
Contributor : Augustin Colette <>
Submitted on : Friday, January 20, 2006 - 5:37:15 PM
Last modification on : Friday, April 5, 2019 - 8:10:40 PM
Long-term archiving on : Monday, September 17, 2012 - 11:05:16 AM

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  • HAL Id : tel-00011438, version 1

Citation

Augustin Colette. Etude expérimentale et numérique de l'influence des processus de
transport depuis la couche-limite sur la variabilité et le bilan d'ozone
troposphérique.. Océan, Atmosphère. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011438⟩

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