Properties of dust aerosol particles transported to Portugal from the Sahara desert期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Properties of dust aerosol particles transported to Portugal from the Sahara desert

Authors:	FRANK WAGNER DANIELE BORTOLI SÉRGIO PEREIRA MARIA JOÃO COSTA ANA MARIA SILVA BERNADETT WEINZIERL MICHAEL ESSELBORN REAS PETZOLD KATHI RASP BERND HEINOLD INA TEGEN

Institution:	Centro de Geofísica, Rua Romão Ramalho 59, 7000 Évora, Portugal;;University of Évora, Physics Department, Rua Romão Ramalho 59, 7000 Évora, Portugal;;Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, 82234 Wessling, Germany;;Leibniz Institute for Tropospheric Research, Leipzig, Germany

Abstract:	Aerosol properties of mineral particles in the far field of an African desert dust outbreak were investigated that brought Saharan dust over the Mediterranean in different layers to Portugal. The measurements were performed inside the project Desert Aerosols over Portugal (DARPO) which was linked to the Saharan Mineral Dust Experiment (SAMUM). The maximum particle mass concentration was about 150 μg m^?3 and the corresponding scattering coefficient was 130 M m^?1 which results in a mass scattering efficiency of 0.87 m² g^?1. The aerosol optical depth reached values up to 0.53 and the lidar ratio was between 45 and 50 in the whole dust loaded column. A comparison between particle size distributions and refractive indices derived from different instruments and models showed a general good agreement but some minor differences could also be observed. Measurements as well as calculations with a particle transport model suggest that there is a relatively higher concentration of very large particles in the upper region of the dust layer than on the surface which is likely connected with meteorological conditions at the observational site (Évora, Portugal).

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