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The chemistry of atmospheric aerosol particles in the Amazon Basin


, : The chemistry of atmospheric aerosol particles in the Amazon Basin. Seidl, P. R. , Gottlieb, O. R. , Kaplan, M. A. C. Acs Symposium Series; Chemistry Of The Amazon: Biodiversity, Natural Products, And Environmental Issues. 265-280

Amazon Basin tropical rainforest is a key region to study the processes that are responsible for global atmospheric changes. There are large emissions of primary biogenic aerosol particles released naturally by the vegetation, and also large amounts of fine mode aerosol particles emitted during biomass burning. Fine and coarse mode aerosol particles were collected at three sites using Stacked Filter Units. Particle induced X-ray emission (PIXE) measured concentrations of up to 20 elements in the fine mode: Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, Zr, and Pb. Biogenic and biomass burning aerosol particles dominate the fine mode mass concentration, with the presence of K, P, S, Cl, Zn, Br, and FPM (Fine mode mass concentration). During the dry season, at two sites, a strong component of biomass burning is observed. Inhalable particulate matter (dp < 10 micrometers) mass concentration up to 700 micrograms/m3 was measured. Absolute Principal Factor Analysis (APFA) showed four components: soil dust (Al, Ca, Ti, Mn, Fe), biomass burning (Black carbon, FPM, K, Cl), natural biogenic particles (K, S, Ca, Mn, Zn), and marine aerosol (Cl). Samples collected directly over biomass burning fires in cerrado and primary forest show large amounts of organic acids, in addition to K, Cl, P, black carbon and other species.

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