A. Abo-riziq, C. Erlick, E. Dinar, R. , and Y. , Optical properties of absorbing and non-absorbing aerosols retrieved by cavity ring down (CRD) spectroscopy, Atmos. Chem. Phys, vol.7, pp.1523-1536, 2007.
URL : https://hal.archives-ouvertes.fr/hal-00296175

G. Adler, T. Koop, C. Haspel, I. Taraniuk, T. Moise et al., Formation of highly porous aerosol particles by atmospheric freeze-drying in ice clouds, Proc. Natl. Acad. Sci. USA, vol.110, pp.20414-20419, 2013.

G. Adler, C. Haspel, T. Moise, R. , and Y. , Optical extinction of highly porous aerosol following atmospheric freeze drying, J. Geophys. Res.-Atmos, vol.119, pp.6768-6787, 2014.

A. G. Allen, T. A. Mather, A. J. Mcgonigle, A. Aiuppa, P. Delmelle et al., Sources, size distribution, and downwind grounding of aerosols from Mount Etna, J. Geophys. Res.-Atmos, vol.111, p.10302, 2006.

M. Ammann and H. Burtscher, Characterization of ultrafine aerosol particles in Mt. Etna emissions, vol.52, pp.577-583, 1990.

D. Baumgardner, J. E. Dye, B. W. Gandrup, and R. G. Knollenberg, Interpretation of measurements made by the Forward Scattering Spectrometer Probe (FSSP-300) during the Airborne Arctic Stratosphere Expedition, J. Geophys. Res.-Atmos, vol.97, pp.8035-8046, 1992.

P. Chýlek, V. Srivastava, R. G. Pinnick, W. , and R. , Scattering of electromagnetic waves by composite spherical particles: Experiment and effective medium approximation, Appl. Optics, vol.27, pp.2396-2404, 1988.

P. Chýlek, G. Videen, D. J. Geldart, J. S. Dobbie, H. C. Tso et al., Effective medium approximations for heterogeneous particles, Light scattering by nonspherical particles, theory, measurements, and applications, pp.273-308, 2000.

P. Delmelle, C. Oppenheimer, D. M. Pyle, J. Barclay, W. D. Dick et al., Optical shape fraction measurements of submicrometre laboratory and atmospheric aerosols, Environmental impacts of tropospheric volcanic gas plumes, vol.213, pp.183-196, 1998.

O. Dubovik, A. Sinyuk, T. Lapyonok, B. N. Holben, M. Mishchenko et al., Application of spheroid models to account for aerosol particle nonsphericity in remote sensing of desert dust, J. Geophys. Res.Atmos, vol.111, p.11208, 2006.

O. Dubovik, M. Herman, A. Holdak, T. Lapyonok, D. Tanré et al., Statistically optimized inversion algorithm for enhanced retrieval of aerosol properties from spectral multi-angle polarimetric satellite observations, Atmos. Meas. Tech, vol.4, pp.975-1018, 2011.

J. E. Dye and D. Baumgardner, Evaluation of the forward scattering spectrometer probe, I-Electronic and optical studies, J. Atmos. Ocean. Tech, vol.1, pp.329-344, 1984.

T. F. Eck, B. N. Holben, J. S. Reid, A. Sinyuk, O. Dubovik et al., Spatial and temporal variability of column-integrated aerosol optical properties in the southern Arabian Gulf and United Arab Emirates in summer, J. Geophys. Res. Atmos, vol.113, p.1204, 2008.

G. Febvre, J. Gayet, V. Shcherbakov, C. Gourbeyre, J. et al., Some effects of ice crystals on the FSSP measurements in mixed phase clouds, Atmos. Chem. Phys, vol.12, pp.8963-8977, 2012.
URL : https://hal.archives-ouvertes.fr/hal-01895886

W. Frey, S. Borrmann, D. Kunkel, R. Weigel, M. De-reus et al., In situ measurements of tropical cloud properties in the West African Monsoon: upper tropospheric ice clouds, Mesoscale Convective System outflow, and subvisual cirrus, Atmos, Chem. Phys, vol.11, pp.5569-5590, 2011.

P. Fulignati, A. Sbrana, R. Clocchiatti, and W. Luperini, Environmental impact of the acid fumarolic plume of a passively degassing volcano, Environ. Geol, vol.49, pp.1139-1155, 2006.

J. Gayet, O. Crépel, J. Fournol, and S. Oshchepkov, A new airborne polar Nephelometer for the measurements of optical and microphysical cloud properties. Part I: Theoretical design, Ann. Geophys, vol.15, pp.451-459, 1997.
URL : https://hal.archives-ouvertes.fr/hal-00329051

J. Gayet, S. Asano, A. Yamazaki, A. Uchiyama, A. Sinyuk et al., Two case studies of winter continental-type water and mixed-phase stratocumuli over the sea: 1. Microphysical and optical properties, J. Geophys. Res, vol.107, p.4569, 2002.
URL : https://hal.archives-ouvertes.fr/hal-01825027

J. Gayet, V. Shcherbakov, C. Voigt, U. Schumann, D. Schäuble et al., The evolution of microphysical and optical properties of an A380 contrail in the vortex phase, Atmos. Chem. Phys, vol.12, pp.6629-6643, 2012.
URL : https://hal.archives-ouvertes.fr/hal-01895872

S. F. Gosse, M. Wang, D. Labrie, C. , and P. , Imaginary part of the refractive index of sulfates and nitrates in the 0.7-2.6 µm spectral region, Appl. Optics, vol.36, pp.3622-3634, 1997.

P. C. Hansen, Analysis of discrete ill-posed problems by means of the L-curve, SIAM Rev, vol.34, pp.561-580, 1992.

G. Heiken and K. Wohletz, , p.246, 1985.

R. Jaenicke and T. Hanusch, Simulation of the Optical Particle Counter Forward Scattering Spectrometer Probe 100 (FSSP-100), Aerosol Sci. Tech, vol.18, pp.309-322, 1993.

G. Y. Jeong and T. Nousiainen, TEM analysis of the internal structures and mineralogy of Asian dust particles and the implications for optical modeling, Atmos. Chem. Phys, vol.14, pp.7233-7254, 2014.

P. Jeßberger, C. Voigt, U. Schumann, I. Sölch, H. Schlager et al., Aircraft type influence on contrail properties, Atmos. Chem. Phys, vol.13, pp.11965-11984, 2013.

R. A. Johnson and D. J. Wichern, Applied multivariate statistical analysis, 4th Edn, vol.816, 1998.

I. T. Jolliffe, Principal Component Analysis, Series: Springer Series in Statistics, 2002.

O. Jourdan, S. Oshchepkov, J. Gayet, V. Shcherbakov, H. Isaka et al., Coupling of the microphysical and optical properties of arctic clouds during the ASTAR 2004 experiment: Implications for light scattering modelling, J. Geophys. Res, vol.108, p.23206, 2003.

T. Jurkat, C. Voigt, F. Arnold, H. Schlager, H. Aufmhoff et al., Airborne stratospheric ITCIMS-measurements of SO 2 , HCl, and www.atmos-chem-phys.net/16/11883, Atmos. Chem. Phys, vol.16, pp.11883-11897, 2016.

V. Shcherbakov, Measurements of HONO, NO, NO y and SO 2 in aircraft exhaust plumes at cruise, Porous aerosol in degassing plumes of Mt. Etna and Mt, vol.115, p.10807, 2010.

T. Jurkat, S. Kaufmann, C. Voigt, D. Schäuble, P. Jeßberger et al., The airborne mass spectrometer AIMS-Part 2: Measurements of trace gases with stratospheric or tropospheric origin in the UTLS, Atmos. Meas. Tech, vol.9, pp.1907-1923, 2016.

R. A. Kahn, W. Li, C. Moroney, D. J. Diner, J. V. Martonchik et al., Aerosol source plume physical characteristics from space-based multiangle imaging, J. Geophys. Res, vol.112, p.11205, 2007.

S. Kaufmann, C. Voigt, P. Jeßberger, T. Jurkat, H. Schlager et al., In situ measurements of ice saturation in young contrails, Geophys. Res. Lett, vol.41, pp.702-709, 2014.
URL : https://hal.archives-ouvertes.fr/hal-01981037

S. Kaufmann, C. Voigt, T. Jurkat, T. Thornberry, D. W. Fahey et al., The airborne mass spectrometer AIMS-Part 1: AIMS-H 2 O for UTLS water vapor measurements, Atmos. Meas. Tech, vol.9, pp.939-953, 2016.

R. Kitamura, L. Pilon, J. , and M. , Optical constants of silica glass from extreme ultraviolet to far infrared at near room temperature, Appl. Optics, vol.46, pp.8118-8133, 2007.

L. Kolokolova and B. A. Gustafson, Scattering by inhomogeneous particles: microwave analog experiments and comparison to effective medium theories, J. Quant. Spectrosc. Ra, vol.70, pp.611-636, 2001.

A. Kylling, M. Kahnert, H. Lindqvist, and T. Nousiainen, Volcanic ash infrared signature: porous non-spherical ash particle shapes compared to homogeneous spherical ash particles, Atmos. Meas. Tech, vol.7, pp.919-929, 2014.

R. Lefevre, A. Gaudichet, and M. A. Billongalland, Silicate microspherules intercepted in the plume of Etna volcano, Nature, vol.322, pp.817-820, 1986.

H. H. Li, Refractive index of alkali halides and its wavelength and temperature derivatives, J. Phys. Chem. Ref. Data, vol.5, pp.329-528, 1976.

D. R. Lide, CRC Handbook of Chemistry and Physics, 90th Edn, 2010.

C. Liu, R. Lee-panetta, Y. , and P. , Inhomogeneity structure and the applicability of effective medium approximations in calculating light scattering by inhomogeneous particles, J. Quant. Spectrosc. Ra, vol.146, pp.331-348, 2014.

F. Marenco, B. Johnson, K. Turnbull, S. Newman, J. Haywood et al., Airborne lidar observations of the 2010 Eyjafjallajökull volcanic ash plume, J. Geophys. Res, vol.116, pp.0-05, 2011.

R. S. Martin, T. A. Mather, D. M. Pyle, M. Power, A. G. Allen et al., Composition-resolved size distributions of volcanic aerosols in the Mt. Etna plumes, J. Geophys. Res, vol.113, p.17211, 2008.

R. S. Martin, T. A. Mather, D. M. Pyle, M. Power, V. I. Tsanev et al., Size distributions of fine silicate and other particles in Masaya's volcanic plume, J. Geophys. Res, vol.114, p.9217, 2009.

S. T. Martin, Phase transitions of aqueous atmospheric particles, Chem. Rev, vol.100, pp.3403-3454, 2000.

T. A. Mather, D. M. Pyle, and C. Oppenheimer, Tropospheric Volcanic Aerosol, Volcanism and the Earth's Atmosphere, 2004.

M. Garnett and J. C. , Colours in metal glasses and in metallic films, Philos. Trans. Roy. Soc. A, vol.203, pp.385-420, 1904.

M. I. Mishchenko, L. D. Travis, R. A. Kahn, and R. A. West, Modeling phase functions for dustlike tropospheric aerosols using a mixture of randomly oriented polydisperse spheroids, J. Geophys. Res, vol.102, pp.16831-16847, 1997.

M. I. Mishchenko, W. J. Wiscombe, J. W. Hovenier, T. , L. D. Hovenier et al., Overview of scattering by nonspherical particles, Light Scattering by Nonspherical Particles, pp.29-60, 2000.

M. I. Mishchenko, J. M. Dlugach, M. A. Yurkin, L. Bi, B. Cairns et al., First-principles modeling of electromagnetic scattering by discrete and discretely heterogeneous random media, J. Quant. Spectrosc. Ra, vol.632, pp.1261-1279, 2009.

J. H. Obenholzner, H. Schroettner, P. Golob, H. Delgado, C. Oppenheimer et al., Sulfur degassing from volcanoes: source conditions, surveillance, plume chemistry and Earth system impacts, Volcanic degassing, vol.213, pp.363-421, 2003.

A. Petzold, R. Busen, F. P. Schröder, R. Baumann, M. Kuhn et al., Nearfield measurements on contrail properties from fuels with different sulfur content, J. Geophys. Res, vol.102, pp.29867-29880, 1997.

R. G. Pinnick and H. J. Auvermann, Response Characteristics of Knollenberg Light-Scattering Aerosol Counters, J. Aerosol Sci, vol.10, pp.55-74, 1979.

M. Pósfai, J. R. Anderson, P. R. Buseck, and H. Sievering, Soot and sulfate aerosol particles in the remote marine troposphere, J. Geophys. Res, vol.104, pp.21685-21693, 1999.

A. Schmidt, K. S. Carslaw, G. W. Mann, A. Rap, K. J. Pringle et al., Importance of tropospheric volcanic aerosol for indirect radiative forcing of climate, Atmos. Chem. Phys, vol.12, pp.7321-7339, 2012.

S. Scollo, R. A. Kahn, D. L. Nelson, M. Coltelli, D. J. Diner et al., MISR observations of Etna volcanic plumes, J. Geophys. Res, vol.117, p.6210, 2012.

V. Shcherbakov, J. Gayet, O. Jourdan, A. Minikin, J. Ström et al., Assessment of cirrus cloud optical and microphysical data reliability by applying statistical procedures, J. Atmos. Ocean. Tech, vol.22, pp.409-420, 2005.
URL : https://hal.archives-ouvertes.fr/hal-01823433

V. Shcherbakov, J. Gayet, B. A. Baker, L. , and R. P. , Light scattering by single natural ice crystals, J. Atmos. Sci, vol.63, pp.1513-1525, 2006.
URL : https://hal.archives-ouvertes.fr/hal-01823427

C. Spinetti, M. F. Buongiorno, V. Lombardo, and L. Merucci, Aerosol optical thickness of Mt. Etna volcanic plume retrieved by means of the Airborne Multispectral Imaging Spectrometer (MIVIS), J. Geophys. Res, vol.46, pp.439-449, 1996.

I. N. Tang and H. R. Munkelwitz, Simultaneous Determination of Refractive Index and Density of an Evaporating Aqueous Solution Droplet, Aerosol Sci. Tech, vol.15, pp.201-207, 1991.

C. Toledano, Y. Bennouna, V. Cachorro, J. P. Ortiz-de-galisteo, A. Stohl et al., Aerosol properties of the Eyjafjallajökull ash derived from sun photometer and satellite observations over the Iberian Peninsula, Atmos. Environ, vol.48, pp.22-32, 2012.

O. B. Toon, J. B. Pollack, and B. N. Khare, The optical constants of several atmospheric aerosol species: ammonium sulfate, aluminum oxide, and sodium chloride, J. Geophys. Res, vol.81, pp.5733-5748, 1976.
DOI : 10.1029/jc081i033p05733

Z. Ulanowski, M. Schnaiter, J. P. Reid, and R. Signorell, UV and visible light scattering and absorption measurements on aerosols in the laboratory, Fundamentals and Applications of Aerosol Spectroscopy, pp.243-268, 2011.

C. Verhaege, V. Shcherbakov, P. , and P. , Limitations on retrieval of complex refractive index of spherical particles from scattering measurements, J. Quant. Spectrosc. Ra, vol.109, pp.2338-2348, 2008.
URL : https://hal.archives-ouvertes.fr/hal-01872535

C. Voigt, U. Schumann, T. Jurkat, D. Schäuble, H. Schlager et al., In-situ observations of young contrails-overview and selected results from the CONCERT campaign, Atmos. Chem. Phys, vol.10, pp.9039-9056, 2010.

C. Voigt, U. Schumann, P. Jessberger, T. Jurkat, A. Petzold et al., Extinction and optical depth of contrails, Geophys. Res. Lett, vol.38, p.11806, 2011.
DOI : 10.1029/2011gl047189

C. Voigt, P. Jessberger, T. Jurkat, S. Kaufmann, R. Baumann et al., Evolution of CO 2 , SO 2 , HCl, and HNO 3 in the volcanic plumes from Etna, Geophys. Res. Lett, vol.41, pp.2196-2203, 2014.

C. Voigt, P. Jeßberger, T. Jurkat, S. Kaufmann, R. Baumann et al., Reply to comment from Liotta and, vol.76, p.865, 2014.

N. Voshchinnikov, G. Videen, and T. Henning, Effective medium theories for irregular fluffy structures: aggregation of small particles, Appl. Optics, vol.46, pp.4065-4072, 2007.
DOI : 10.1364/ao.46.004065

URL : http://arxiv.org/pdf/astro-ph/0703023v1.pdf

F. Waquet, F. Peers, P. Goloub, F. Ducos, F. Thieuleux et al., Retrieval of the Eyjafjallajökull volcanic aerosol optical and microphysical properties from POLDER/PARASOL measurements, Atmos. Chem. Phys, vol.14, pp.1755-1768, 2014.
DOI : 10.5194/acpd-13-8663-2013

URL : https://doi.org/10.5194/acpd-13-8663-2013

I. M. Watson and C. Oppenheimer, Particle size distributions of Mount Etna's aerosol plume constrained by Sun photometry, J. Geophys. Res, vol.105, pp.9823-9829, 2000.
DOI : 10.1029/2000jd900042

I. M. Watson and C. Oppenheimer, Photometric observations of Mt. Etna's different aerosol plumes, Atmos. Environ, vol.35, pp.3561-3572, 2001.

P. Yang, L. Bi, B. A. Baum, K. Liou, G. W. Kattawar et al., Spectrally Consistent Scattering, Absorption, and Polarization Properties of Atmospheric Ice Crystals at Wavelengths from 0.2 to 100 µm, J. Atmos. Sci, vol.70, pp.330-347, 2013.
DOI : 10.1175/jas-d-12-039.1

C. L. Young, I. N. Sokolik, and J. Dufek, Regional radiative impact of volcanic aerosol from the 2009 eruption of Mt. Redoubt, Atmos. Chem. Phys, vol.12, pp.3699-3715, 2012.