Author/Authors :
Toledano، نويسنده , , C. and Bennouna، نويسنده , , Y. and Cachorro، نويسنده , , V. and Ortiz de Galisteo، نويسنده , , J.P. and Stohl، نويسنده , , A. and Stebel، نويسنده , , K. and Kristiansen، نويسنده , , N.I. and Olmo، نويسنده , , F.J. and Lyamani، نويسنده , , H. and Obregَn، نويسنده , , M.A. and Estellés، نويسنده , , V. and Wagner، نويسنده , , F. and Baldasano، نويسنده , , J.M. and Gonzلlez-Castanedo، نويسنده , , Y. and Clarisse، نويسنده , , L. and de Frutos، نويسنده , , A.M.، نويسنده ,
Abstract :
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.
Keywords :
AERONET , Optical properties , Remote sensing , FLEXPART , Eyjafjallajِkull , Sun photometer
