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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Submicron particle mass concentrations and sources in the Amazonian wet season (AMAZE-08)

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Autor(es):
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Chen, Q. [1, 2] ; Farmer, D. K. [3, 4] ; Rizzo, L. V. [5] ; Pauliquevis, T. [5] ; Kuwata, M. [1, 2] ; Karl, T. G. [6] ; Guenther, A. [6] ; Allan, J. D. [7, 8] ; Coe, H. [7, 8] ; Andreae, M. O. [9, 10] ; Poeschl, U. [9, 10] ; Jimenez, J. L. [3, 4] ; Artaxo, P. [11, 12] ; Martin, S. T. [1, 2]
Número total de Autores: 14
Afiliação do(s) autor(es):
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[1] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 - USA
[2] Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 - USA
[3] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 - USA
[4] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 - USA
[5] Univ Fed Sao Paulo, Dept Nat & Earth Sci, Diadema - Brazil
[6] Natl Ctr Atmospher Res, Boulder, CO 80307 - USA
[7] Univ Manchester, Natl Ctr Atmospher Sci, Manchester, Lancs - England
[8] Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester, Lancs - England
[9] Max Planck Inst Chem, Biogeochem Dept, D-55128 Mainz - Germany
[10] Max Planck Inst Chem, Multiphase Chem Dept, D-55128 Mainz - Germany
[11] Univ Sao Paulo, Dept Atmospher Sci, Sao Paulo - Brazil
[12] Univ Sao Paulo, Appl Phys Dept, Sao Paulo - Brazil
Número total de Afiliações: 12
Tipo de documento: Artigo Científico
Fonte: Atmospheric Chemistry and Physics; v. 15, n. 7, p. 3687-3701, 2015.
Citações Web of Science: 50
Resumo

Real-time mass spectra of the non-refractory species in submicron aerosol particles were recorded in a tropical rainforest in the central Amazon Basin during the wet season from February to March 2008, as a part of the Amazonian Aerosol Characterization Experiment (AMAZE-08). Organic material accounted on average for more than 80% of the non-refractory submicron particle mass concentrations during the period of measurements. There was insufficient ammonium to neutralize sulfate. In this acidic, isoprene-rich, HO2-dominant environment, positive-matrix factorization of the time series of particle mass spectra identified four statistical factors to account for the 99% of the variance in the signal intensities of the organic constituents. The first factor was identified as associated with regional and local pollution and labeled ``HOA{''} for its hydrocarbon-like characteristics. A second factor was associated with long-range transport and labeled ``OOA-1{''} for its oxygenated characteristics. A third factor, labeled ``OOA-2,{''} was implicated as associated with the reactive uptake of isoprene oxidation products, especially of epoxydiols to acidic haze, fog, or cloud droplets. A fourth factor, labeled ``OOA-3,{''} was consistent with an association with the fresh production of secondary organic material (SOM) by the mechanism of gasphase oxidation of biogenic volatile organic precursors followed by gas-to-particle conversion of the oxidation products. The suffixes 1, 2, and 3 on the OOA labels signify ordinal ranking with respect to the extent of oxidation represented by the factor. The process of aqueous-phase oxidation of water-soluble products of gas-phase photochemistry might also have been associated to some extent with the OOA-2 factor. The campaign-average factor loadings had a ratio of 1.4 : 1 for OOA-2 : OOA-3, suggesting the comparable importance of particle-phase compared to gas-phase pathways for the production of SOM during the study period. (AU)

Processo FAPESP: 10/52658-1 - Brazil-UK Network for Investigation of Amazonian Atmospheric Composition and Impacts on Climate
Beneficiário:Paulo Eduardo Artaxo Netto
Linha de fomento: 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
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
Processo FAPESP: 11/50170-4 - Produção de aerossóis secundários na Amazônia e seus efeitos climáticos
Beneficiário:Paulo Eduardo Artaxo Netto
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
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
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular