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Optical characteristics of aerosol across Europe (WP2.2)

Optical characteristics of aerosol across Europe (WP2.2). Dry/wet aerosol optical properties (and how we got there) Optical closure (agreement between Mie modelled scattering/absorption starting from chemical composition information, and in-situ measured scattering and absorption).

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Optical characteristics of aerosol across Europe (WP2.2)

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  1. Optical characteristics of aerosol across Europe (WP2.2) • Dry/wet aerosol optical properties (and how we got there) • Optical closure (agreement between Mie modelled scattering/absorption starting from chemical composition information, and in-situ measured scattering and absorption)

  2. Optical depth in EUCAARI

  3. Single scattering albedo (SSA) in ADIENT/EUCAARI Wet SSA calculated using ambient RH and campaign average hygroscopic growth curve to scale measured scattering

  4. During (largely) spring time anticylonic event… • AOD gradient from east to west with AOD increasing (contributing factors aging, RH, emissions, increase in proportion of nitrates towards west) • SSA more consistently between 0.93 and 0.97; lower values near known fresh plumes, higher values more spread out (c.f. previous work: ADRIEX mean 0.92, TARFOX 0.87, ACE2 0.94) • Issue about B368 and the Baltic… real or not…

  5. SSA in EUCAARI – including Baltic points (note different colour scale from previous plot) Should we include/not include flight B368 in Baltic?

  6. Optical closure (scattering) in ADIENT/EUCAARI

  7. Optical closure (absorption)during ADIENT/EUCAARI

  8. Scattering closure is pretty good (i.e. within 30%) – slight bias towards model underestimation, but PCASP potentially undersamples… • Absorption not quite so good but probably larger uncertainties on PSAP and SP2…

  9. Where next? • Writing up paper using all available data (should ADIENT Sept flights and June this year flights be included, or should it just concentrate on the anticyclonic event from EUCAARI?) • Comparison with ground sites (AERONET and (for September flights) Weybourne Lidar • Analysis of future flights and linking to likely processes, chemical composition etc

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