Reply to comment from Liotta and Rizzo on “Evolution of CO2, SO2, HCl and HNO3 in the volcanic plumes from Etna” by Voigt et al. [Geophys. Res. Lett.; 41, doi:10.1002/2013GL058974]

Voigt, Christiane; Jeßberger, Philipp; Jurkat, Tina; Kaufmann, Stefan H. E.; Baumann, Robert; Schläger, Hans; Bobrowski, Nicole; Giuffrida, Giovanni; Salerno, Giuseppe

doi:10.1007/s00445-014-0865-z

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…The measured ASIs of inhomogeneous particles show reasonable agreement with effective medium approximations (Kolokolova and Gustafson, 2001). The effective medium approximation (EMA), along with the Maxwell Garnett mixing rule, has already been used in a number of works to calculate optical properties of porous particles (see, e.g., Voshchinnikov et al, 2007;Kylling et al, 2014). The question of EMA applicability is discussed in detail by Mishchenko et al (2016).…”

Section: Discussion and Inferencesmentioning

confidence: 99%

Porous aerosol in degassing plumes of Mt. Etna and Mt. Stromboli

Shcherbakov¹,

Jourdan²,

Voigt³

et al. 2016

Preprint

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Aerosols of the volcanic degassing plumes from Mt. Etna and Mt. Stromboli were probed with in situ instruments on board the Deutsches Zentrum fur Luft- und Raumfahrt research aircraft Falcon during the contrail, volcano, and cirrus experiment CONCERT in September 2011. Aerosol properties were analyzed using angular-scattering intensities and particle size distributions measured simultaneously with the Polar Nephelometer and the Forward Scattering Spectrometer probes (FSSP series 100 and 300), respectively. Aerosols of degassing plumes are characterized by low values of the asymmetry parameter (between 0.6 and 0.75); the effective diameter was within the range of 1.5-2.8 mu m and the maximal diameter was lower than 20 mu m. A principal component analysis applied to the Polar Nephelometer data indicates that scattering features of volcanic aerosols of different crater origins are clearly distinctive from angular-scattering intensities of cirrus and contrails. Retrievals of aerosol properties revealed that the particles were "optically spherical" and the estimated values of the real part of the refractive index are within the interval from 1.35 to 1.38. The interpretation of these results leads to the conclusion that the degassing plume aerosols were porous with air voids. Our estimates suggest that aerosol particles contained about 18 to 35% of air voids in terms of the total volume

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Section: Discussion and Inferencesmentioning

confidence: 99%

Porous aerosol in degassing plumes of Mt. Etna and Mt. Stromboli

Shcherbakov¹,

Jourdan²,

Voigt³

et al. 2016

Preprint

View full text Add to dashboard Cite

show abstract

Porous aerosol in degassing plumes of Mt. Etna and Mt. Stromboli

Shcherbakov¹,

Jourdan²,

Voigt³

et al. 2016

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. Aerosols of the volcanic degassing plumes from Mt. Etna and Mt. Stromboli were probed with in situ instruments on board the Deutsches Zentrum für Luft-und Raumfahrt research aircraft Falcon during the contrail, volcano, and cirrus experiment CONCERT in September 2011. Aerosol properties were analyzed using angular-scattering intensities and particle size distributions measured simultaneously with the Polar Nephelometer and the Forward Scattering Spectrometer probes (FSSP series 100 and 300), respectively. Aerosols of degassing plumes are characterized by low values of the asymmetry parameter (between 0.6 and 0.75); the effective diameter was within the range of 1.5-2.8 µm and the maximal diameter was lower than 20 µm. A principal component analysis applied to the Polar Nephelometer data indicates that scattering features of volcanic aerosols of different crater origins are clearly distinctive from angular-scattering intensities of cirrus and contrails. Retrievals of aerosol properties revealed that the particles were "optically spherical" and the estimated values of the real part of the refractive index are within the interval from 1.35 to 1.38. The interpretation of these results leads to the conclusion that the degassing plume aerosols were porous with air voids. Our estimates suggest that aerosol particles contained about 18 to 35 % of air voids in terms of the total volume.

show abstract

Reply to comment from Liotta and Rizzo on “Evolution of CO2, SO2, HCl and HNO3 in the volcanic plumes from Etna” by Voigt et al. [Geophys. Res. Lett.; 41, doi:10.1002/2013GL058974]

Cited by 2 publications

References 14 publications

Porous aerosol in degassing plumes of Mt. Etna and Mt. Stromboli

Porous aerosol in degassing plumes of Mt. Etna and Mt. Stromboli

Porous aerosol in degassing plumes of Mt. Etna and Mt. Stromboli

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