Polar stratospheric clouds of liquid aerosol: An experimental determination of mean size distribution

Year: 1999

Authors: Pantani M., Del Guasta M., Guzzi D., Stefanutti L.

Autors Affiliation: Fisbat-CNR, Via Gobetti 101, 40129 Bologna, Italy; IROE-CNR Nello Carrara, Via Panciatichi 64, 50127 Florence, Italy

Abstract: The determination of the mean size distribution for a Type Ib Polar Stratospheric Cloud (\’PSC\’) has been performed for the first time using extinction/backscattering ratios as obtained from LIDAR data at 355, 532 and 750 nm. The multiwavelength Lidar was operated in Sodankyla, Finland, during the Second European Stratospheric Arctic and Middle-latitudes Experiment (SESAME, November 1994-April 1995). It produced vertical profiles of PSC. Log-normal distributions of supercooled ternary solution (STS), composed of H2SO4-HNO3-H2O particles with mode radius of 0.68-0.9 µm and standard deviation of 1.1-1.4, were retrieved as best fit to experimental data. Laboratory measurements of n, (real part of refractive index), in the 404-633 nm range, show that it depends on the water/acid ratio without any distinction between binary and ternary solutions of nitric and sulphuric acid.

Journal/Review: JOURNAL OF AEROSOL SCIENCE

Volume: 30 (5)      Pages from: 559  to: 567

KeyWords: Atmospheric aerosols; Atmospheric chemistry; Atmospheric composition; Electromagnetic wave backscattering; Light extinction; Nitric acid; Optical radar; Particle size analysis; Refractive index; Sulfuric acid; Upper atmosphere; Water, Supercooled ternary solution (STS), Clouds, nitric acid; sulfurous acid; water, aerosol; Arctic; article; cloud; particle size; priority journal; stratosphere
DOI: 10.1016/S0021-8502(98)00753-8

Citations: 2
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