Characterization of submicron aerosol chemical composition and sources in the coastal area of Central Chile

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http://hdl.handle.net/10138/298815

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Saarikoski , S , Reyes , F , Vázquez , Y , Tagle , M , Timonen , H , Aurela , M , Carbone , S , Worsnop , D R , Hillamo , R & Oyola , P 2019 , ' Characterization of submicron aerosol chemical composition and sources in the coastal area of Central Chile ' , Atmospheric Environment , vol. 199 , pp. 391-401 . https://doi.org/10.1016/j.atmosenv.2018.11.040

Title: Characterization of submicron aerosol chemical composition and sources in the coastal area of Central Chile
Author: Saarikoski, S.; Reyes, F.; Vázquez, Y.; Tagle, M.; Timonen, H.; Aurela, M.; Carbone, S.; Worsnop, D.R.; Hillamo, R.; Oyola, P.
Contributor: University of Helsinki, Department of Physics
Date: 2019-02-15
Language: eng
Number of pages: 11
Belongs to series: Atmospheric Environment
ISSN: 1352-2310
URI: http://hdl.handle.net/10138/298815
Abstract: Chemical characteristics and the sources of submicron particles (<1 mu m in diameter) were investigated in Valle Alegre, the coastal area of Central Chile. The chemical composition of particles was studied by using a Soot particle Aerosol Mass Spectrometer and Multi-Angle Absorption Photometer. Submicron particles were dominated by organics (42% of mass) and sulfate (39% of mass) while the mass fractions of ammonium, nitrate and black carbon were much smaller (13, 2 and 4% of mass, respectively). Additionally, several metals (V, Zn, Fe, Cd, Cu, K, Na and Mg) were detected in submicron particles and also some of their inorganic salts (e.g. NaCl+, MgCl2+, CaCl2+, KCl+ and KNO3+). The sources of particles were examined by using Positive Matrix Factorization (PMF). Organic aerosol (OA) was divided into five factors by using PMF; hydrocarbon-like OA (HOA), biomass burning OA (BBOA), low-volatility oxygenated OA (LV-OOA), semi-volatile OA (SV-OOA) and marine oxygenated OOA (MOOA), Oxygenated factors (LV-OOA; SV-OOA and MOOA) comprised 75% of total OA with LV-OOA being the dominant factor (38% of OA). Sulfate had two major sources in Valle Alegre; similar to 70% of sulfate was related to anthropogenic sources through the oxidation of gas phase SO2 whereas similar to 24% of sulfate was associated with biogenic origin related to the oxidation of dimethyl sulfide in the marine environment. Regarding total submicron particle mass (campaign-average 9.5 mu g m(-3)), the contribution of anthropogenic sources was at least as large as that of biogenic origin.
Subject: Submicron particles
Chemical composition
Aerosol Mass Spectrometer
Source apportionment
South America
SECONDARY ORGANIC AEROSOL
POSITIVE MATRIX FACTORIZATION
HIGH-RESOLUTION
MASS-SPECTROMETER
PARTICLE COMPOSITION
SP-AMS
SOOT
EMISSIONS
SANTIAGO
APPORTIONMENT
114 Physical sciences
1172 Environmental sciences
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