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|Title:||Submicron particle mass concentrations and sources in the Amazonian wet season (AMAZE-08)||Authors:||Chen, Q.
Farmer, D. K.
Rizzo, L. V.
Karl, T. G.
Allan, J. D.
Andreae, M. O.
Jimenez, J. L.
Martin, S. T.
|Keywords:||DRNTU::Science::Physics::Meteorology and climatology||Issue Date:||2015||Source:||Chen, Q., Farmer, D. K., Rizzo, L. V., Pauliquevis, T., Kuwata, M., Karl, T. G., et al. (2015). Submicron particle mass concentrations and sources in the Amazonian wet season (AMAZE-08). Atmospheric chemistry and physics, 15(7), 3687-3701.||Series/Report no.:||Atmospheric chemistry and physics||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 gas-phase 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.||URI:||https://hdl.handle.net/10356/107275
|ISSN:||1680-7324||DOI:||10.5194/acp-15-3687-2015||Rights:||© Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License.||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||EOS Journal Articles|
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