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Long-range transport and tropospheric ozone variability in the western Mediterranean region during the Intercontinental Transport of Ozone and Precursors (ITOP-2004) campaign

Ravetta, F. and Ancellet, G. and Colette, A. and Schlager, H. (2007) Long-range transport and tropospheric ozone variability in the western Mediterranean region during the Intercontinental Transport of Ozone and Precursors (ITOP-2004) campaign. Journal of Geophysical Research, 112 (D10S46), pp. 1-12. DOI: 10.1029/2006JD007724.

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Official URL: http://www.agu.org/journals/jd/jd0710/2006JD007724/2006JD007724.pdf

Abstract

Two ground-based ozone lidars have been operated at Observatoire de Haute Provence (OHP) for 11 days during the Intercontinental Transport of Ozone and Precursors (ITOP-2004) measurement campaign. Ozone and scattering ratio vertical profiles have been measured from the boundary layer up to the tropopause. At first order, tropospheric ozone temporal variability is due to local pollution within the planetary boundary layer and to stratosphere-troposphere exchange. Remaining ozone rich layers within the free troposphere are related to long-range transport processes. Transport pathways are discussed combining Lagrangian particle dispersion modeling analysis and upstream airborne in situ measurements of the chemical composition of these air masses. High ozone and CO mixing ratios measured within polluted plumes aboard the aircraft correspond to ozone and aerosol layers seen by the lidar. Most of these layers have their origin in North America where they are uplifted either by forest fires or by warm conveyor belts in the vicinity of frontal regions. During the campaign, these polluted and thin (<1 km) layers remain coherent and are transported in a Lagrangian manner over the Atlantic Ocean. The layers observed above OHP in the lower free troposphere exhibit ozone mixing ratio 50% larger than background values. With an ozone content of 3 to 6 Dobson Units, these layers increase by 5 to 10% the background tropospheric ozone column.

Document Type:Article
Title:Long-range transport and tropospheric ozone variability in the western Mediterranean region during the Intercontinental Transport of Ozone and Precursors (ITOP-2004) campaign
Authors:
AuthorsInstitution or Email of Authors
Ravetta, F.Univ. Pierre et Marie Curie, Paris, F
Ancellet, G.Univ. Pierre et Marie Curie, Paris, F
Colette, A.Univ. Pierre et Marie Curie, Paris, F
Schlager, H.UNSPECIFIED
Date:24 May 2007
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:112
DOI:10.1029/2006JD007724
Page Range:pp. 1-12
Status:Published
Keywords:Intercontinental transport, pollution plumes, aerosol layers, ozone lidar, long-range transport
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Helga Jesse
Deposited On:17 Jul 2007
Last Modified:20 Oct 2014 14:32

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