In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 18, No. 22 ( 2018-11-21), p. 16481-16498
Abstract:
Abstract. Recurring transboundary haze from Indonesian wildfires in previous
decades significantly elevated particulate matter (PM) concentrations in
Southeast Asia. During that event on 10 to 31 October 2015, we conducted a
real-time observation of non-refractory submicron PM (NR-PM1) in
Singapore using an Aerodyne aerosol mass spectrometer. Simultaneously, we
characterized carbonaceous components and organic aerosol (OA) tracers from
fine PM (PM2.5) samples to support source apportionment of the online
measurements. The real-time analysis demonstrated that OA accounted for
approximately 80 % of NR-PM1 mass during the wildfire haze period.
Source apportionment analysis applied to the OA mass spectra using the
multilinear-engine (ME-2) approach resulted in four factors: hydrocarbon-like
OA (HOA), biomass burning OA (BBOA), peat burning OA (PBOA), and oxygenated
OA (OOA). The OOA can be considered as a surrogate of both secondary organic
aerosol (SOA) and oxidized primary organic aerosol (OPOA), while the other
factors are considered as surrogates of primary organic aerosol (POA). The
OOA accounted for approximately 50 % of the total OA mass in NR-PM1,
while POA subtypes from wildfires (BBOA and PBOA) contributed to
approximately 30 % of the total OA mass. Our findings highlight the
importance of atmospheric chemical processes, which likely include POA
oxidation and SOA formation from oxidation of gaseous precursors, to the OOA
concentration. As this research could not separately quantify the POA
oxidation and SOA formation processes, further studies should attempt to
investigate the contribution of gaseous precursor oxidation and POA aging to
the OOA formation in wildfire plumes.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-18-16481-2018
DOI:
10.5194/acp-18-16481-2018-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2018
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1
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