Aerosol properties of the Eyjafjallajökull ash derived from sun photometer and satellite observations over the Iberian Peninsula

• Published in: Atmospheric environment (1994) 2012-03, Vol.48, p.22-32
• Main Authors: Toledano, C., Bennouna, Y., Cachorro, V., Ortiz de Galisteo, J.P., Stohl, A., Stebel, K., Kristiansen, N.I., Olmo, F.J., Lyamani, H., Obregón, M.A., Estellés, V., Wagner, F., Baldasano, J.M., González-Castanedo, Y., Clarisse, L., de Frutos, A.M.
• Format: Article
• Language: English
• Subjects: absorption; AERONET; Aerosols; Aspectes ambientals; atmospheric chemistry; Contaminació atmosfèrica; Degradació ambiental; Desenvolupament humà i sostenible; Enginyeria electrònica; Environmental aspects; Eyjafjallajökull; FLEXPART; Fotometria; Meteorologia; Meteorology; Optical properties; Optoelectrònica; particle size; Photometry; Remote sensing; Sun photometer; Teledetecció; wavelengths; Àrees temàtiques de la UPC
• ISSN: 1352-2310; 1873-2844
• DOI: 10.1016/j.atmosenv.2011.09.072

The Eyjafjallajökull ash that crossed over Spain and Portugal on 6–12 May 2010 has been monitored by a set of operational sun photometer sites within AERONET-RIMA and satellite sensors. The sun photometer observations (aerosol optical depth, coarse mode concentrations) and ash products from IASI and SEVIRI satellite sensors, together with FLEXPART simulations of particle transport, allow identifying the volcanic aerosols. The aerosol columnar properties derived from inversions were investigated, indicating specific properties, especially regarding the absorption. The single scattering albedo was high (0.95 at 440 nm) and nearly wavelength independent, although with slight decrease with wavelength. Other parameters, like the fine mode fraction of the volume size distributions (0.20–0.80) or the portion of spherical particles (15–90%), were very variable among the sites and indicated that the various ash clouds were inhomogeneous with respect to particle size and shape. ► Ground-based sun photometer and satellite data confirm ash over the Iberian Peninsula on 6–12 May. ► Volcanic ash optical properties, especially regarding absorption, are different from other aerosol types. ► Mean size and shape were highly variable depending on the site and the dates.