Mineralogical composition of aerosols at Amsterdam Island

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GAUDICHET, A. ; LEFÈVRE, R. ; GAUDRY, A. ; ARDOUIN, B. ; LAMBERT, G. ; MILLER, J. M. (2011)

In this paper, data on the mineralogical composition of insoluble particulate matter collected in May, July and September 1984 at Amsterdam Island, South Indian Ocean (34°47'S, 77°31'E) are presented for the first time. Atmospheric levels of these insoluble aerosols remain very low (from 0.25 to 0.01 μg m-3); the size of the particles is mainly in the submicronic range. The long-range continental origin of these particles is well confirmed by atmospheric tracers such as 222Rn and 210Pb and by air mass back-trajectories. Continental inputs, mainly from South Africa and Madagascar, that can be identified by “radonic storms” have a high illite/kaolinite ratio. However those from Australia, though less frequent at Amsterdam Island, have a low illite/kaolinite ratio. Thus, kaolinite can be considered a good tracer of transport of Australian aerosols into the subantarctic.DOI: 10.1111/j.1600-0889.1989.tb00313.x
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