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Investigating Aging Effects on Dust Properties in the Nord-Tropical Atlantic

This study explores the modifications of dust's physico-chemical and optical properties due to aging, utilizing data from the AMMA, DODO, and GERBILS campaigns, as well as the FENNEC campaign in June 2011. We analyze source regions and receptor sites, particularly focusing on Puerto Rico during PRADACS (June-July 2011). Key processes investigated include mixing, heterogeneous reactions, and changes in size and shape distributions of dust particles. Comprehensive measurements include full chemical characterization and advanced analytical techniques.

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Investigating Aging Effects on Dust Properties in the Nord-Tropical Atlantic

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  1. AMMA/DODO/GERBILS Looking at modifications of dust physico-chemical and optical properties due to aging P. Formenti -LISA • Observations close to source and at a receptor site • Source regions: data from previous campaigns (AMMA/DODO/GERBILS) + FENNEC (June 2011) – aircraft and surface sampling • Receptor site: Puerto Rico during PRADACS (June-July 2011) Nord-tropical Atlantic PRADACS FENNEC Reid et al., 2003

  2. Processes to be investigated • Mixing • Heterogeneous reactions • Changes in size distribution due to deposition • Changes in shape distribution Nord-tropical Atlantic PRADACS Reid et al., 2003

  3. Measurements • Full chemical/mineralogical characterisation • Bulk filter sampling • X-ray fluorescence, X-Ray diffraction, X-ray absorption, E-SEM&E-TEM analysis, chemical extraction method for iron oxides • Number size distribution • GRIMM OPC • Gas tracer concentrations • Ozone, CO, SO2…. Nord-tropical Atlantic PRADACS Reid et al., 2003

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