Aerosol variability induced by atmospheric ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Aerosol variability induced by atmospheric dynamics in a coastal area of senegal, north-western africa
Auteur(s) :
Crumeyrolle, Suzanne [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Augustin, Patrick [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Rivellini, Laura-Helena [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Ecole nationale supérieure Mines-Télécom Lille Douai [IMT Nord Europe]
Choël, Marie [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Riffault, Veronique [Auteur]
Ecole nationale supérieure Mines-Télécom Lille Douai [IMT Nord Europe]
Deboudt, Karine [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Fourmentin, Marc [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Dieudonne, Elsa [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Delbarre, Herve [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Derimian, Yevgeny [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Chiapello, Isabelle [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Augustin, Patrick [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Rivellini, Laura-Helena [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Ecole nationale supérieure Mines-Télécom Lille Douai [IMT Nord Europe]
Choël, Marie [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Riffault, Veronique [Auteur]
Ecole nationale supérieure Mines-Télécom Lille Douai [IMT Nord Europe]
Deboudt, Karine [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Fourmentin, Marc [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Dieudonne, Elsa [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Delbarre, Herve [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Derimian, Yevgeny [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Chiapello, Isabelle [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Titre de la revue :
Atmospheric environment
Nom court de la revue :
Atmos. Environ.
Numéro :
203
Pagination :
228-241
Date de publication :
2019-04-15
ISSN :
1352-2310
Mot(s)-clé(s) en anglais :
Aerosol
Sea breeze
Dynamics
Pollution
In-situ and remote
Sensing measurements
Sea breeze
Dynamics
Pollution
In-situ and remote
Sensing measurements
Discipline(s) HAL :
Physique [physics]
Résumé en anglais : [en]
During the first Intensive Observation Period (IOP1) of the SHADOW (SaHAran Dust Over West Africa) campaign carried out during March-June 2015, the Mbour site (Senegal) was reinforced with a large setup of in-situ and ...
Lire la suite >During the first Intensive Observation Period (IOP1) of the SHADOW (SaHAran Dust Over West Africa) campaign carried out during March-June 2015, the Mbour site (Senegal) was reinforced with a large setup of in-situ and remote sensing instruments to measure the aerosol optical, physical and chemical properties as well as the atmospheric dynamical features over the site. Here, we use this dataset to study the impact of Sea Breeze (SB) on the aerosol properties. Two case studies were selected: (i) one representative of SB events observed during typical Harmattan conditions, (ii) and one representative of SB events observed during a Harmattan desert dust event. Both cases show a strong influence of the SB period on the dry Mass Scattering Efficiency (MSE), which increases by a factor of up to 1.4. Given the fact that SB occurred every other day at this coastal site during IOP1 (dry season) and that the relative humidity may reach 96%, the effect of such event on the radiative forcing may not be negligible. In order to evaluate the effects of different flows on aerosol transport, recirculation and stagnation factors were retrieved from wind components. The air mass recirculation factor implies that aerosols previously transported from the land over the sea are then brought back inland. In both cases, high recirculation factors were calculated (between 0.84 and 0.98) and air mass stagnation was observed right before the SB establishment. However, this stagnation is observed over the sea during the first case while it is located near the coast during the second case, which has a significant impact on the aerosol evolution. Indeed, a stagnation of air masses over the sea is associated with an increase in fine aerosol mass concentrations (PM1, PM2.5) due to a higher contribution of marine and anthropogenic sources notably for organic aerosols, and a higher contribution of more-oxidized organics. This contribution is lower when the air mass stagnation occurs over the shoreline during the desert dust event.Lire moins >
Lire la suite >During the first Intensive Observation Period (IOP1) of the SHADOW (SaHAran Dust Over West Africa) campaign carried out during March-June 2015, the Mbour site (Senegal) was reinforced with a large setup of in-situ and remote sensing instruments to measure the aerosol optical, physical and chemical properties as well as the atmospheric dynamical features over the site. Here, we use this dataset to study the impact of Sea Breeze (SB) on the aerosol properties. Two case studies were selected: (i) one representative of SB events observed during typical Harmattan conditions, (ii) and one representative of SB events observed during a Harmattan desert dust event. Both cases show a strong influence of the SB period on the dry Mass Scattering Efficiency (MSE), which increases by a factor of up to 1.4. Given the fact that SB occurred every other day at this coastal site during IOP1 (dry season) and that the relative humidity may reach 96%, the effect of such event on the radiative forcing may not be negligible. In order to evaluate the effects of different flows on aerosol transport, recirculation and stagnation factors were retrieved from wind components. The air mass recirculation factor implies that aerosols previously transported from the land over the sea are then brought back inland. In both cases, high recirculation factors were calculated (between 0.84 and 0.98) and air mass stagnation was observed right before the SB establishment. However, this stagnation is observed over the sea during the first case while it is located near the coast during the second case, which has a significant impact on the aerosol evolution. Indeed, a stagnation of air masses over the sea is associated with an increase in fine aerosol mass concentrations (PM1, PM2.5) due to a higher contribution of marine and anthropogenic sources notably for organic aerosols, and a higher contribution of more-oxidized organics. This contribution is lower when the air mass stagnation occurs over the shoreline during the desert dust event.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
ENSCL
CNRS
Université de Lille
CNRS
Université de Lille
Collections :
Date de dépôt :
2024-01-30T11:45:58Z
2024-02-19T16:00:46Z
2024-02-19T16:00:46Z