Volatility of aerosol particles from NO3 oxidation of various biogenic organic precursors
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Published:2023-07-05
Issue:13
Volume:23
Page:7347-7362
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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:
Graham Emelie L., Wu Cheng, Bell David M., Bertrand Amelie, Haslett Sophie L.ORCID, Baltensperger UrsORCID, El Haddad ImadORCID, Krejci RadovanORCID, Riipinen Ilona, Mohr ClaudiaORCID
Abstract
Abstract. Secondary organic aerosol (SOA) is formed through the oxidation of volatile
organic compounds (VOCs), which can be of both natural and anthropogenic
origin. While the hydroxyl radical (OH) and ozone (O3) are the main
atmospheric oxidants during the day, the nitrate radical (NO3) becomes
more important during the nighttime. Yet, atmospheric nitrate chemistry has
received less attention compared to OH and O3. The Nitrate Aerosol and Volatility Experiment (NArVE) aimed to study the
NO3-induced SOA formation and evolution from three biogenic VOCs
(BVOCs), namely isoprene, α-pinene, and β-caryophyllene. The
volatility of aerosol particles was studied using isothermal evaporation
chambers, temperature-dependent evaporation in a volatility tandem
differential mobility analyzer (VTDMA), and thermal desorption in a filter
inlet for gases and aerosols coupled to a chemical ionization mass
spectrometer (FIGAERO-CIMS). Data from these three setups present a cohesive
picture of the volatility of the SOA formed in the dark from the three
biogenic precursors. Under our experimental conditions, the SOA formed from
NO3 + α-pinene was generally more volatile than SOA from
α-pinene ozonolysis, while the NO3 oxidation of isoprene
produced similar although slightly less volatile SOA than α-pinene
under our experimental conditions. β-Caryophyllene reactions with
NO3 resulted in the least volatile species. Four different parameterizations for estimating the saturation vapor
pressure of the oxidation products were tested for reproducing the observed
evaporation in a kinetic modeling framework. Our results show that the SOA
from nitrate oxidation of α-pinene or isoprene is dominated by
low-volatility organic compounds (LVOCs) and semi-volatile organic compounds
(SVOCs), while the corresponding SOA from β-caryophyllene consists
primarily of extremely low-volatility organic compounds (ELVOCs) and LVOCs.
The parameterizations yielded variable results in terms of reproducing the
observed evaporation, and generally the comparisons pointed to a need for
re-evaluating the treatment of the nitrate group in such parameterizations.
Strategies for improving the predictive power of the volatility
parameterizations, particularly in relation to the contribution from the
nitrate group, are discussed.
Funder
Horizon 2020 European Research Council Knut och Alice Wallenbergs Stiftelse
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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