Title :

Aerosol characterization in an oceanic context around Reunion Island (AEROMARINE field campaign)

Author(s) :

Mascaut, Faustine [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Pujol, Olivier [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Peroni, Raphael [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Metzger, Jean-Marc [Auteur]
Observatoire des Sciences de l'Univers de La Réunion [OSU-Réunion]
Blarel, Luc [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Podvin, Thierry [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Goloub, Philippe [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Sellegri, Karine [Auteur]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Thornberry, Troy [Auteur]
NOAA Chemical Sciences Laboratory [CSL]
Cooperative Institute for Research in Environmental Sciences [CIRES]
Duflot, Valentin [Auteur]
Laboratoire de l'Atmosphère et des Cyclones [LACy]
Tulet, Pierre [Auteur]
Laboratoire d'aérologie [LAERO]
Brioude, Jérôme [Auteur]
Laboratoire de l'Atmosphère et des Cyclones [LACy]

Journal title :

Atmospheric environment

Volume number :

268

Pages :

-

Publication date :

2022-01-01

ISSN :

1352-2310

Keyword(s) :

Sea salt aerosols
Pristine conditions
Southern indian Ocean
AEROMARINE field Campaigs

English abstract : [en]

This article presents the results of the AEROMARINE field campaign which took place between February and April 2019 off the coast of Reunion Island in the South West Indian Ocean basin. The Southern Indian Ocean is of major ...
Show more >This article presents the results of the AEROMARINE field campaign which took place between February and April 2019 off the coast of Reunion Island in the South West Indian Ocean basin. The Southern Indian Ocean is of major interest for the study of marine aerosols, their distribution and variability. Six instrumented light plane flights and a ground-based microwave radiometer were used during the field campaign. These measurements were compared with the long-term measurements of the AERONET sun-photometer (based in St Denis, Reunion Island) and various instruments of the high altitude Maïdo Observatory (2.2 km above sea level, Reunion Island). These results were also analyzed using different model outputs: (i) the AROME mesoscale weather forecast model to work on the thermodynamics of the boundary layer, (ii) the FLEXPART-AROME Lagrangian particle dispersion model to assess the geographical and vertical origin of air masses, and (iii) the chemical transport model CAMS (Copernicus Atmosphere Monitoring Service) to work on the aerosol chemical composition of air masses. This allowed to highlight two points: (1) the atmospheric layer above 1.5 km is mainly composed of aerosols from the regional background; (2) the local environment (ocean or island) has little impact on the measured concentrations. Marine aerosols emitted locally are mostly measured below 0.5 km. The daytime marine aerosol distributions in the free troposphere measured by the aircraft were compared to the night-time aerosol distributions measured at the high altitude Maïdo Observatory when the Observatory is located in the free troposphere. The results indicate that this high altitude site of measurements is representative of the marine aerosol concentrations in the free troposphere. We also found that the CAMS reanalyses overestimated the aerosol optical depth in this region. Finally, our study strongly suggests that the AERONET station in St Denis (Reunion Island) can be considered as a representative marine station under the Tropics.Show less >

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

• Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518

Submission date :

2024-01-16T22:37:40Z
2024-02-08T14:50:43Z