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

Autor(en)

Valery Shcherbakov, Olivier Jourdan, Christiane Voigt, Jean-Francois Gayet, Aurelien Chauvigne, Alfons Schwarzenboeck, Andreas Minikin, Marcus Klingebiel, Ralf Weigel, Stephan Borrmann, Tina Jurkat, Stefan Kaufmann, Romy Schlage, Christophe Gourbeyre, Guy Febvre, Tatyana Lapyonok, Wiebke Frey, Sergej Molleker, Bernadett Weinzierl

Abstrakt

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 1.5-2.8μm and the maximal diameter was lower than 20μm. 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.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

Univeristé Clermont Auvergne, Université Blaise Pascal, Clermont-Ferrand II, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Johannes Gutenberg-Universität Mainz, Max-Planck-Institut für Meteorologie, Université Lille I - Sciences et Technologies, Max-Planck-Institut für Chemie (Otto-Hahn-Institut), University of Manchester

Journal

Atmospheric Chemistry and Physics

Band

16

Seiten

11883-11897

Anzahl der Seiten

15

ISSN

1680-7316

DOI

https://doi.org/10.5194/acp-16-11883-2016

Publikationsdatum

09-2016

Peer-reviewed

Ja

ÖFOS 2012

103039 Aerosolphysik

Schlagwörter

ASJC Scopus Sachgebiete

Atmospheric Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0662ad77-87bc-4cf8-a6e2-a20898397236