Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43387
Title: Chemical characterization and source apportionment of size-resolved particles in Hong Kong sub-urban area
Authors: Gao, Y
Lee, SC 
Huang, Y
Chow, JC
Watson, JG
Keywords: Aerosol size distribution
Carbonaceous aerosol
Inorganic ions
MOUDI
PMF
Issue Date: 2016
Publisher: Elsevier
Source: Atmospheric research, 2016, v. 170, p. 112-122 How to cite?
Journal: Atmospheric research 
Abstract: Size-resolved particulate matter (PM) samples were collected with a 10-stage Micro-Orifice Uniform Deposit Impactor (MOUDI) at a sub-urban site (Tung Chung) in Hong Kong for four non-consecutive months representing four seasons from 2011 to 2012. Major chemical components were water-soluble anions (i.e., Cl-, NO3 -, and SO4 2-), cations (i.e., NH4 +, Na+, K+, and Ca2+), organic and elemental carbon and elements. Both chemical mass closure and positive matrix factorization (PMF) were employed to understand the chemical composition, resolve particle size modes, and evaluate the PM sources. Tri-modal size distributions were found for PM mass and major chemical components (e.g., SO4 2-, NH4 +, and OC). Mass median aerodynamic diameters (MMADs) with similar standard deviations (1.32<σ<1.42) were 0.4, 0.7 and 3.8μm, consistent with condensation, droplet and coarse modes. A bi-modal distribution peaking at condensation and droplet modes was found for EC, with a single mode peaking at 3.8μm for Cl-. Besides secondary SO4 2-, carbonaceous aerosol dominated the condensation mode with 27% by engine exhaust and 18-19% each by residual oil combustion (shipping) and coal/biomass burning. Secondary SO4 2- is also the most dominant component in the droplet mode, accounting for 23% of PM mass, followed by an industrial source (19%). Engine exhaust, secondary NO3 -, and sea salt each accounted for 13-15% of PM mass. Sea salt and soil are the dominated sources in the coarse mode, accounting for ~80% of coarse mass.
URI: http://hdl.handle.net/10397/43387
ISSN: 0169-8095
EISSN: 1873-2895
DOI: 10.1016/j.atmosres.2015.11.015
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

4
Last Week
0
Last month
Citations as of Sep 26, 2017

WEB OF SCIENCETM
Citations

2
Last Week
0
Last month
Citations as of Sep 22, 2017

Page view(s)

42
Last Week
1
Last month
Checked on Sep 24, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.