Investigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episode
The international ESCOMPTE campaign, which took place in summer 2001 in the most highly polluted French region, was devoted to validate air pollution prediction models. Surface and remote sensing instruments (Lidar, Radar and Sodar) were deployed over the Marseille area, along the Mediterranean c...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2006-11-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/24/2809/2006/angeo-24-2809-2006.pdf |
| _version_ | 1811194739400114176 |
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| author | P. Augustin H. Delbarre F. Lohou B. Campistron V. Puygrenier H. Cachier T. Lombardo |
| author_facet | P. Augustin H. Delbarre F. Lohou B. Campistron V. Puygrenier H. Cachier T. Lombardo |
| author_sort | P. Augustin |
| collection | DOAJ |
| description | The international ESCOMPTE campaign, which took place in summer 2001 in the
most highly polluted French region, was devoted to validate air pollution
prediction models. Surface and remote sensing instruments (Lidar, Radar and
Sodar) were deployed over the Marseille area, along the Mediterranean coast,
in order to investigate the fine structure of the sea-breeze circulation and
its relationship with the pollutant concentrations.
<br><br>
The geographical situation of the Marseille region combines a complex coastline
and relief which both lead to a peculiar behaviour of the sea-breeze circulation.
Several local sea breezes, perpendicular to the nearest coastline, settled
in during the morning. In the afternoons, when the thermal gradient between
the continental and marine surface grows up, a southerly or a westerly
sea breeze may dominate. Their respective importance is then a function of
time, space and altitude. Furthermore, an oscillation of the westerly
sea breeze with a period of about 3 h is also highlighted.
<br><br>
We show that these dynamical characteristics have profound influences on the
atmospheric boundary-layer (ABL) development and on pollutant
concentrations. In fact, the direction and intensity of the sea-breeze determine
the route and the transit time of the stable marine air flow over the
continental surface. Thus, the ABL depth may exhibit several collapses
correlated with the westerly sea-breeze pulsation. The ozone and aerosol
concentrations are also related to the dynamical features. In the suburbs
and parts of the city under pulsed sea breezes, a higher ABL depth and
higher ozone concentrations are observed. In the city centre, this
relationship between pulsed sea-breeze intensity and ozone concentration is
different, emphasising the importance of the transit time and also the
build-up of pollutants in the marine air mass along the route. Finally, the
variations of aerosol concentration are also described according to the breeze
direction. |
| first_indexed | 2024-04-12T00:31:40Z |
| format | Article |
| id | doaj.art-0d738133dd78426bb0b7e102cbf05ecc |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-12T00:31:40Z |
| publishDate | 2006-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-0d738133dd78426bb0b7e102cbf05ecc2022-12-22T03:55:18ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762006-11-01242809282210.5194/angeo-24-2809-2006Investigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episodeP. Augustin0H. Delbarre1F. Lohou2B. Campistron3V. Puygrenier4H. Cachier5T. Lombardo6Laboratoire de Physico-Chimie de l'Atmosphère, UMR CNRS 8101, Université du Littoral-Côte d'Opale, 189A, Avenue M. Schumann, 59140 Dunkerque, FranceLaboratoire de Physico-Chimie de l'Atmosphère, UMR CNRS 8101, Université du Littoral-Côte d'Opale, 189A, Avenue M. Schumann, 59140 Dunkerque, FranceLaboratoire d'Aérologie, UMR 5560 CNRS/OMP/UPS, Centre de Recherches Atmosphériques, 65300 Campistrous, FranceLaboratoire d'Aérologie, UMR 5560 CNRS/OMP/UPS, Centre de Recherches Atmosphériques, 65300 Campistrous, FranceLaboratoire d'Aérologie, UMR 5560 CNRS/OMP/UPS, Centre de Recherches Atmosphériques, 65300 Campistrous, FranceLaboratoire des Sciences du Climat et de l'Environnement, UMR CNRS-CEA 1572, avenue de la Terrasse, 91198 Gif sur Yvette, FranceLaboratoire des Sciences du Climat et de l'Environnement, UMR CNRS-CEA 1572, avenue de la Terrasse, 91198 Gif sur Yvette, FranceThe international ESCOMPTE campaign, which took place in summer 2001 in the most highly polluted French region, was devoted to validate air pollution prediction models. Surface and remote sensing instruments (Lidar, Radar and Sodar) were deployed over the Marseille area, along the Mediterranean coast, in order to investigate the fine structure of the sea-breeze circulation and its relationship with the pollutant concentrations. <br><br> The geographical situation of the Marseille region combines a complex coastline and relief which both lead to a peculiar behaviour of the sea-breeze circulation. Several local sea breezes, perpendicular to the nearest coastline, settled in during the morning. In the afternoons, when the thermal gradient between the continental and marine surface grows up, a southerly or a westerly sea breeze may dominate. Their respective importance is then a function of time, space and altitude. Furthermore, an oscillation of the westerly sea breeze with a period of about 3 h is also highlighted. <br><br> We show that these dynamical characteristics have profound influences on the atmospheric boundary-layer (ABL) development and on pollutant concentrations. In fact, the direction and intensity of the sea-breeze determine the route and the transit time of the stable marine air flow over the continental surface. Thus, the ABL depth may exhibit several collapses correlated with the westerly sea-breeze pulsation. The ozone and aerosol concentrations are also related to the dynamical features. In the suburbs and parts of the city under pulsed sea breezes, a higher ABL depth and higher ozone concentrations are observed. In the city centre, this relationship between pulsed sea-breeze intensity and ozone concentration is different, emphasising the importance of the transit time and also the build-up of pollutants in the marine air mass along the route. Finally, the variations of aerosol concentration are also described according to the breeze direction.https://www.ann-geophys.net/24/2809/2006/angeo-24-2809-2006.pdf |
| spellingShingle | P. Augustin H. Delbarre F. Lohou B. Campistron V. Puygrenier H. Cachier T. Lombardo Investigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episode Annales Geophysicae |
| title | Investigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episode |
| title_full | Investigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episode |
| title_fullStr | Investigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episode |
| title_full_unstemmed | Investigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episode |
| title_short | Investigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episode |
| title_sort | investigation of local meteorological events and their relationship with ozone and aerosols during an escompte photochemical episode |
| url | https://www.ann-geophys.net/24/2809/2006/angeo-24-2809-2006.pdf |
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