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Grimm/OPC

DLR Lab tests 7 March 2011 Eyjafjalla ground samples. Diluter 1/100. Separator of sample lines (Flow rate : 2.6 – 3.2 l/min). Bottle for ash particles mixing. Grimm/OPC. Polar Nephelometer. Exhaust tube connected to pump. FIRST RUN (12:18 – 12:54). 10 4.

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Grimm/OPC

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  1. DLR Lab tests 7 March 2011 Eyjafjalla ground samples Diluter 1/100 Separator of sample lines (Flow rate : 2.6 – 3.2 l/min) Bottle for ash particles mixing Grimm/OPC Polar Nephelometer Exhaust tube connected to pump

  2. FIRST RUN (12:18 – 12:54) 104 Grimm part. conc. (l-1 mm-1) 0 Total Particle concentration (GRIMM data)

  3. PN measured phase function

  4. Interpretation of the PN measured optical properties Inversion model developed by Dubovik et al. (2006) for aerosol (AERONET) and adapted to contrail and ash particles by V. Shcherbakov. ● Measurements : Scattering phase function (PN) ● Retrieved parameters : - Refractive index (real and imaginary components) - Particle size distribution - Distribution of spherical / aspherical particle ratio (SAR) Aspherical particles = mixture of oblate / prolate spheroids (0.5 / 1.5 aspect ratios). ● Validation of the results : - FSSP-300 / FSSP-100 size distribution taking into account theoretical calibration with retrieved refractive index information.

  5. DLR Lab tests 7 March 2011 Eyjafjalla ground samples Grimm Shcherbakov’s inversion technique (two components) : Extret. = 1.36 km-1 gret. = 0.70 n = 1.49 + 0.0005 i Spherical / aspherical partitioning (SAR) = 32% 32% of spherical particles and 68% of aspherical particles

  6. normalized to the maximal value

  7. 30 September 2011 Flight Stromboli & Etna plume measurements 3 May 2012

  8. Etna upper plume Etna lower plume Stromboli

  9. Etna upper plume Etna lower plume Stromboli

  10. Nb of occurences Assymetry parameter

  11. Etna_2-4 upper plume Etna_1-3 lower plume Altitude (m) Stromboli 0.75 0.77 0.79 0.81 0.83 Asymmetry parameter

  12. Upper plume Lower plume Etna plumes

  13. Carl Rottmann (1797 – 1850)Taormina mit dem Ätna vohl 1829

  14. Stromboli

  15. Stromboli Retieved Measured

  16. Stromboli

  17. Etna_1 Lower plume

  18. Etna_2 Upper plume

  19. Summary of results Refractive indexes n c ● Concert2 Stromboli plume (30/09/2011) 1.34 0.0005100% spherical ● Concert2 Etna upper plume (30/09/2011) 1.34 0.0005 100% spherical ● Concert2 Etna lower plume (30/09/2011) 1.36 0.0005 100% spherical ● DLR lab tests Eyjafjalla ground samples 1.49 0.0005 ~ 70% aspherical ● Eyjafjalla plume Schumann et al., 2011 1.59 0.004 – 0.008 - ● Eyjafjalla Plume - Johnson et al. 2012 1.52 0.0015

  20. Etna_1 Lower plume

  21. Etna_2 Upper plume

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