In Situ Airborne Measurements of Aerosol Optical Properties During Photochemical Pollution Events

Aerosol optical properties (scattering, absorbing coefficients and single scattering albedo) were derived from in-situ aircraft based measurements during two photochemical pollution events near Marseille. Both horizontal distribution and vertical profiles are presented. Plumes of enhanced scattering and absorption are observed to be formed in the sea-breeze-driven outflow of the coastal urban-industrial area of Marseille. Simultaneously, the domain-averaged absorption coefficient increases significantly. Differences in photochemical activity lead to different single scattering albedo. The changes in optical properties happen almost entirely within the boundary layer. No significant variation of optical properties are observed in the Upper Layer (1 - 3 km), where the aerosol optical properties are considered to be well mixed.

MALLET Marc;  VAN DINGENEN Rita;  ROGER Jean-Claude;  DESPIAU Serge;  CACHIER Helene; 

2005-10-26

AMER GEOPHYSICAL UNION

JRC30752

https://publications.jrc.ec.europa.eu/repository/handle/JRC30752,