Aerosol microphysics over a tropical coastal station inferred from the spectral dependence of Angstrom wavelength exponent and inversion of spectral aerosol optical depths |
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| Authors: | S Naseema Beegum K Krishna Moorthy S Suresh Babu |
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| Institution: | 1. Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), EA 4492, Maison de la Recherche en Environnement Industriel, Université du Littoral Côte d′Opale, 145 Avenue Maurice Schumann, 59140 Dunkerque, France;2. Groupe de Recherche Molécules Bioactives, Ecole Doctorale des Sciences et Technologies, Université Libanaise, Liban;3. Centre Commun de Mesures, Maison de la Recherche en Environnement Industriel 1, Université du Littoral Côte d′Opale, 145 Avenue Maurice Schumann, 59140 Dunkerque, France;4. Université Lille Nord de France, Lille, France;5. Département de Biologie, Faculté des Sciences, Université Libanaise, Liban;6. Département de Chimie et de Biochimie, Faculté des Sciences, Université Libanaise, Liban;1. Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695022, India;2. Radio & Atmospheric Sciences Division, National Physical Laboratory, CSIR, New Delhi 110012, India;3. Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore 560012, India;4. Divecha Centre for Climate Change, Indian Institute of Science, Bangalore 560012, India;5. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;6. Laboratoire Image Ville Environnement, ERL 7230, Faculté de géographie et d''aménagement, 3, rue de l''Argonne, 67000 Strasbourg, France;1. ChemTech – Industrial Filtering System, Kolejowa St. 53, 05-092 ?omianki, Poland;2. Department of Inorganic Chemistry, Faculty of Chemistry, Maria Curie Sk?odowska University, Maria Curie Sk?odowska Sq. 2, 20-031 Lublin, Poland |
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| Abstract: | Six years of spectral aerosol optical depth (AOD) measurements have been analyzed from a tropical coastal site, Trivandrum (8.55°N, 76.9°E, 3 m msl) to infer on the seasonal changes in the microphysical properties of columnar aerosols, by examining the derivatives of the Angstrom wavelength exponent (α) in the wavelength domain (α′λ) as well as in AOD domain (α′τ) and by retrieving the columnar size distribution by numerical inversion of the AODs. The inference of the changes in the aerosol microphysics drawn from the features of the derivatives α′λ and α′τ is consistent with the pattern revealed by the aerosol properties obtained from the columnar size distributions retrieved from the AOD spectra as well as from the surface measurements of mass-size distributions, which are supported by the back-trajectory cluster analysis and the results of chemical species analysis. |
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