| Full text | |
| Author(s): Show less - |
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]
Total Authors: 14
|
| Affiliation: Show less - | [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
Total Affiliations: 12
|
| Document type: | Journal article |
| Source: | Atmospheric Chemistry and Physics; v. 15, n. 7, p. 3687-3701, 2015. |
| Web of Science Citations: | 52 |
| Abstract | |
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) | |
| FAPESP's process: | 10/52658-1 - Brazil-UK Network for Investigation of Amazonian Atmospheric Composition and Impacts on Climate |
| Grantee: | Paulo Eduardo Artaxo Netto |
| Support Opportunities: | Research Program on Global Climate Change - Regular Grants |
| FAPESP's process: | 08/58100-2 - Aeroclima: direct and indirect effects of aerosols on climate in Amazonia and Pantanal |
| Grantee: | Paulo Eduardo Artaxo Netto |
| Support Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 12/14437-9 - Study of physico-chemical properties of biomass burning aerosols and the radiative forcing at the SAMBBA experiment - the South American Biomass Burning Analysis |
| Grantee: | Paulo Eduardo Artaxo Netto |
| Support Opportunities: | Research Program on Global Climate Change - Regular Grants |