Volatility measurement of atmospheric submicron aerosols in an urban atmosphere in southern China
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Published:2018-02-06
Issue:3
Volume:18
Page:1729-1743
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Cao Li-Ming,Huang Xiao-Feng,Li Yuan-Yuan,Hu Min,He Ling-Yan
Abstract
Abstract. Aerosol pollution has been a very serious environmental problem in
China for many years. The volatility of aerosols can affect the
distribution of compounds in the gas and aerosol phases, the
atmospheric fates of the corresponding components, and the
measurement of the concentration of aerosols. Compared to the
characterization of chemical composition, few studies have focused
on the volatility of aerosols in China. In this study,
a thermodenuder aerosol mass spectrometer (TD-AMS) system was
deployed to study the volatility of non-refractory submicron
particulate matter (PM1) species during winter in
Shenzhen. To our knowledge, this paper is the first report of the
volatilities of aerosol chemical components based on a TD-AMS system
in China. The average PM1 mass concentration during the
experiment was 42.7±20.1 µg m−3, with organic
aerosol (OA) being the most abundant component (43.2 % of the
total mass). The volatility of chemical species measured by the AMS
varied, with nitrate showing the highest volatility, with a mass
fraction remaining (MFR) of 0.57 at 50 ∘C. Organics showed
semi-volatile characteristics (the MFR was 0.88 at 50 ∘C),
and the volatility had a relatively linear correlation with the TD
temperature (from the ambient temperature to 200 ∘C), with
an evaporation rate of 0.45 %∘C-1. Five
subtypes of OA were resolved from total OA using positive matrix
factorization (PMF) for data obtained under both ambient temperature
and high temperatures through the TD, including a hydrocarbon-like
OA (HOA, accounting for 13.5 %), a cooking OA (COA,
20.6 %), a biomass-burning OA (BBOA, 8.9 %), and two
oxygenated OAs (OOAs): a less-oxidized OOA (LO-OOA, 39.1 %) and
a more-oxidized OOA (MO-OOA, 17.9 %). Different OA factors
presented different volatilities, and the volatility sequence of the
OA factors at 50 ∘C was HOA (MFR of 0.56) > LO-OOA
(0.70) > COA (0.85) ≈ BBOA (0.87) > MO-OOA (0.99),
which was not completely consistent with the sequence of their
O ∕ C ratios. The high volatility of HOA implied that
it had a high potential to be oxidized to secondary species in the
gas phase. The aerosol volatility measurement results in this study
provide useful parameters for the modeling work of aerosol
evolution in China and are also helpful in understanding the
formation mechanisms of secondary aerosols.
Funder
National Natural Science Foundation of China Ministry of Science and Technology of the People's Republic of China
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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