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Aerosol complexity in megacities: From size-resolved chemical composition to optical properties of the Beijing atmospheric particles
Roger J.C., Guinot B., Cachier H., Mallet M., Dubovik O., Yu T.
Geophysical Research Letters 36 (2009) L18806 - http://hal.archives-ouvertes.fr/hal-00562372
Articles dans des revues avec comité de lecture
Physique/Physique/Physique Atmosphérique et Océanique
Aerosol complexity in megacities: From size-resolved chemical composition to optical properties of the Beijing atmospheric particles
J. C. Roger 1, B. Guinot 2, 3, H. Cachier 2, M. Mallet 3, O. Dubovik 4, Tong Yu 5
1 :  Department of Geography
University of Maryland at College Park
University of Maryland College Park Maryland
États-Unis
2 :  Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE)
http://www.lsce.ipsl.fr/
CNRS : UMR8212 – CEA : DSM/LSCE – Université de Versailles Saint-Quentin-en-Yvelines
LSCE-CEA-Orme des Merisiers (point courrier 129) F-91191 GIF-SUR-YVETTE CEDEX LSCE-Vallée Bât. 12, avenue de la Terrasse, F-91198 GIF-SUR-YVETTE CEDEX
France
3 :  Laboratoire d'aérologie (LA)
http://www.aero.obs-mip.fr/
CNRS : UMR5560 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III
14 avenue Edouard Belin 31400 Toulouse
France
4 :  Laboratoire d'optique atmosphèrique (LOA)
http://www-loa.univ-lille1.fr
CNRS : UMR8518 – INSU – Université Lille I - Sciences et technologies
Bât. P5 59655 VILLENEUVE D ASCQ CEDEX
France
5 :  Beijing Municipal Environmental Monitoring Centre
Beijing Municipal Environmental Monitoring Centre
Beijing
Chine
Megacities need adapted tools for the accurate modeling of aerosol impacts. For this purpose a new experimental data processing has been worked out for Beijing aerosols as case study. Size-resolved aerosol particles were extensively sampled during winter and summer 2003 and subsequently fully chemically characterized. The product is an aerosol model presenting a new particle pattern (mode number, size and chemistry) without any prerequisite constrain either on the mode number or on each mode chemical composition. Six modes were found and five of them consistently appear as internally mixed particles organized around a black carbon or a dust core coated by organic and/or inorganic material. Data were checked by robust comparisons with other experimental data (particle number, sunphotometer-derived derived data). We found the presence of two accumulation modes in different internal mixing and optical calculations show that the Beijing aerosol single scattering albedo (ωo # 0.90) is significantly higher than expected. Such an approach would allow realistic modeling of atmospheric particle impacts under complex situations.
Anglais

Geophysical Research Letters (Geophys. Res. Lett.)
Publisher American Geophysical Union (AGU)
ISSN 0094-8276 
internationale
2009
36
L18806

megacity aerosol model – size-resolved aerosol chemical composition – aerosol optical properties.