Atmospheric aerosols in Amazonia and land use change: from natural biogenic to biomass burning conditions

Autor(es)

Artaxo, Paulo ^[1] ; Rizzo, Luciana V. ^[2] ; Brito, Joel F. ^[1] ; Barbosa, Henrique M. J. ^[1] ; Arana, Andrea ^[1] ; Sena, Elisa T. ^[1] ; Cirino, Glauber G. ^[3] ; Bastos, Wanderlei ^[4] ; Martin, Scot T. ^{[5, 6]} ; Andreae, Meinrat O. ^[7]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, Inst Environm Chem & Pharmaceut Sci, Dept Earth & Exact Sci, BR-09972270 Diadema Sao Paulo - Brazil

^[3] INPA, BR-69067375 Manaus, Amazonas - Brazil

^[4] Univ Fed Rondonia UNIR, Lab Biogeoquim Ambiental Wolfgang C Pfeiffer, Rondonia - Brazil

^[5] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 - USA

^[6] Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 - USA

^[7] Max Planck Inst Chem, Biogeochem Dept, D-55020 Mainz - Germany

• Tipo de documento: Artigo Científico
• Fonte: FARADAY DISCUSSIONS; v. 165, p. 203-235, 2013.
• Citações Web of Science: 82

Resumo

In the wet season, a large portion of the Amazon region constitutes one of the most pristine continental areas, with very low concentrations of atmospheric trace gases and aerosol particles. However, land use change modifies the biosphere-atmosphere interactions in such a way that key processes that maintain the functioning of Amazonia are substantially altered. This study presents a comparison between aerosol properties observed at a preserved forest site in Central Amazonia (TT34 North of Manaus) and at a heavily biomass burning impacted site in south-western Amazonia (PVH, close to Porto Velho). Amazonian aerosols were characterized in detail, including aerosol size distributions, aerosol light absorption and scattering, optical depth and aerosol inorganic and organic composition, among other properties. The central Amazonia site (TT34) showed low aerosol concentrations (PM2.5 of 1.3 +/- 0.7 mu g m(-3) and 3.4 +/- 2.0 mu g m(-3) in the wet and dry seasons, respectively), with a median particle number concentration of 220 cm(-3) in the wet season and 2200 cm(-3) in the dry season. At the impacted site (PVH), aerosol loadings were one order of magnitude higher (PM2.5 of 10.2 +/- 9.0 mu g m(-3) and 33.0 +/- 36.0 mu g m(-3) in the wet and dry seasons, respectively). The aerosol number concentration at the impacted site ranged from 680 cm(-3) in the wet season up to 20 000 cm(-3) in the dry season. An aerosol chemical speciation monitor (ACSM) was deployed in 2013 at both sites, and it shows that (AU)

• Processo FAPESP: 11/50170-4 - Produção de aerossóis secundários na Amazônia e seus efeitos climáticos
• Beneficiário: Paulo Eduardo Artaxo Netto
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 10/52658-1 - Brazil-UK Network for Investigation of Amazonian Atmospheric Composition and Impacts on Climate
• Beneficiário: Paulo Eduardo Artaxo Netto
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 08/58100-2 - Aeroclima: efeitos diretos e indiretos de aerossóis no clima da Amazônia e Pantanal
• Beneficiário: Paulo Eduardo Artaxo Netto
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 12/14437-9 - Estudo de propriedades físico-químicas de aerossóis de queimadas e forçante radiativa no experimento SAMBBA - the South American Biomass Burning Analysis
• Beneficiário: Paulo Eduardo Artaxo Netto
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular