Formation and chemical composition of atmospheric aerosols in an equatorial forest area |
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| Authors: | B Clairac R Delmas B Cros H Cachier P Buat-Ménard J Servant |
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| Institution: | (1) Faculté des Sciences, B.P. 69, Brazzaville, R.P. Congo;(2) Laboratoire Mixte CNRS-CEA, Centre des Faibles Radioactivités, 91190 Gif-sur-Yvette, France;(3) Laboratoire d'Aérologie, UPS, 118, Route de Narbonne, 31062 Toulouse Cedex, France |
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| Abstract: | The physical properties and the chemical composition of atmospheric aerosols have been studied in an equatorial region in the southern Congo (Africa). Field experiments were conducted between 1978 and 1983 in the equatorial forest of the Mayombe during periods where the influence of biomass burning was minimum. The results indicate that the forest is a net source of both fine particles resulting primarily from gas-to-particle conversion and coarse particles produced by mechanical processes. Carbonaceous matter is the major component of these biogenic particles but the forest is also a significant source of sulfate, nitrate, ammonium and potassium. Half of this carbon is attached to submicron particles and likely derives from organic gaseous precursors naturally emitted by the local biosphere.Presented at the international Symposium  Influence of marine and terrestrial biosphere on the chemical composition of the atmosphere , held in Mainz, F.R.G., on 16–22 March 1986. |
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| Keywords: | Equatorial forest atmospheric aerosols size distribution chemical composition |
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