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Title: Size spectra and source apportionment of fine particulates in tropical urban environment during southwest monsoon season
Authors: Zong, Yichen
Botero, Maria L.
Yu, Liya E.
Kraft, Markus
Keywords: Engineering::Chemical engineering
Issue Date: 2018
Source: Zong, Y., Botero, M. L., Yu, L. E., & Kraft, M. (2019). Size spectra and source apportionment of fine particulates in tropical urban environment during southwest monsoon season. Environmental Pollution, 244, 477-485. doi:10.1016/j.envpol.2018.09.124
Journal: Environmental Pollution
Abstract: In this study, we carried out high time-resolution measurements of particle number concentration and size distribution (5–1000 nm) in Singapore, which represents a tropical urban environment. The measurements were taken during the southwest monsoon season in 2017 using a fast-response differential mobility spectrometer at a sampling rate of 1 Hz. In the measurement, short-lived nucleation events were found prominent at early afternoon because of the abundant incoming radiation that enhances the photochemical reactions in atmosphere. For the first time in the region, a five-factor positive matrix factorization approach was applied to the size spectra data. Based on particle number concentration, two sources within nucleation mode (30 nm) were resolved and account for 43% of total number concentration, which is higher than the available monitoring data in other big cities. Among the sources, O3-related atmospheric photochemical reactions with peak size at 10–12 nm is a unique factor and prominent in early afternoon nucleation events. The findings of this work can serve as a baseline for assessing influence of local and cross-border airborne emissions during various seasons in the future.
ISSN: 0269-7491
DOI: 10.1016/j.envpol.2018.09.124
Rights: © 2018 Elsevier Ltd. All rights reserved. This paper was published in Environmental Pollution and is made available with permission of Elsevier Ltd.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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