Refractive index of aerosol particles over the Amazon tropical ... OPCs measure the magnitude of light scattering by individual aerosol particles and then use.
Aerosol Science 34 (2003) 883 – 907 www.elsevier.com/locate/jaerosci
Refractive index of aerosol particles over the Amazon tropical forest during LBA-EUSTACH 1999 Pascal Guyona;∗ , Olivier Boucherb; c , Bim Grahama , Jens Becka , Olga L. Mayol-Braceroa , Gregory C. Robertsa , Willy Maenhautd , Paulo Artaxoe , Meinrat O. Andreaea a
Department of Biogeochemistry, Max Planck Institute for Chemistry, POB 3060 Biogeochemistry, 55020 Mainz, Germany b Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany c Laboratoire d’Optique Atmosph)erique, CNRS/USTL, Villeneuve d’Ascq, France d Institute for Nuclear Sciences, Ghent University, Gent, Belgium e Institute for Physics, University of S˜ao Paulo, S˜ao Paulo, Brazil Received 4 July 2002; accepted 1 March 2003
Abstract Optical properties of aerosol particles were characterized during two :eld campaigns at a remote rainforest site in Rondˆonia, Brazil, as part of the project European Studies on Trace Gases and Atmospheric Chemistry, a contribution to the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA-EUSTACH). The measurements included background (wet season), biomass burning (dry season), and transition period conditions. Optical measurements of light scattering and absorption were combined with data on number/size distributions in a new iterative method, which retrieves the e
