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Gao L, Buchholz A, Li Z, Song J, Vallon M, Jiang F, Möhler O, Leisner T, Saathoff H. Volatility of Secondary Organic Aerosol from β-Caryophyllene Ozonolysis over a Wide Tropospheric Temperature Range. Environ Sci Technol 2023; 57:8965-8974. [PMID: 37286187 PMCID: PMC10286803 DOI: 10.1021/acs.est.3c01151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 05/06/2023] [Accepted: 05/15/2023] [Indexed: 06/09/2023]
Abstract
We investigated secondary organic aerosol (SOA) from β-caryophyllene oxidation generated over a wide tropospheric temperature range (213-313 K) from ozonolysis. Positive matrix factorization (PMF) was used to deconvolute the desorption data (thermograms) of SOA products detected by a chemical ionization mass spectrometer (FIGAERO-CIMS). A nonmonotonic dependence of particle volatility (saturation concentration at 298 K, C298K*) on formation temperature (213-313 K) was observed, primarily due to temperature-dependent formation pathways of β-caryophyllene oxidation products. The PMF analysis grouped detected ions into 11 compound groups (factors) with characteristic volatility. These compound groups act as indicators for the underlying SOA formation mechanisms. Their different temperature responses revealed that the relevant chemical pathways (e.g., autoxidation, oligomer formation, and isomer formation) had distinct optimal temperatures between 213 and 313 K, significantly beyond the effect of temperature-dependent partitioning. Furthermore, PMF-resolved volatility groups were compared with volatility basis set (VBS) distributions based on different vapor pressure estimation methods. The variation of the volatilities predicted by different methods is affected by highly oxygenated molecules, isomers, and thermal decomposition of oligomers with long carbon chains. This work distinguishes multiple isomers and identifies compound groups of varying volatilities, providing new insights into the temperature-dependent formation mechanisms of β-caryophyllene-derived SOA particles.
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Affiliation(s)
- Linyu Gao
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, Karlsruhe 76344, Germany
- Institute
of Geography and Geoecology, Working Group for Environmental Mineralogy
and Environmental System Analysis, Karlsruhe
Institute of Technology, Karlsruhe 76131, Germany
| | - Angela Buchholz
- Department
of Technical Physics, University of Eastern
Finland, Kuopio 70210, Finland
| | - Zijun Li
- Department
of Technical Physics, University of Eastern
Finland, Kuopio 70210, Finland
- International
Laboratory for Air Quality and Health, School of Earth and Atmospheric
Sciences, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Junwei Song
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, Karlsruhe 76344, Germany
- Institute
of Geography and Geoecology, Working Group for Environmental Mineralogy
and Environmental System Analysis, Karlsruhe
Institute of Technology, Karlsruhe 76131, Germany
| | - Magdalena Vallon
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, Karlsruhe 76344, Germany
| | - Feng Jiang
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, Karlsruhe 76344, Germany
- Institute
of Geography and Geoecology, Working Group for Environmental Mineralogy
and Environmental System Analysis, Karlsruhe
Institute of Technology, Karlsruhe 76131, Germany
| | - Ottmar Möhler
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, Karlsruhe 76344, Germany
| | - Thomas Leisner
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, Karlsruhe 76344, Germany
- Institute
of Environmental Physics, Heidelberg University, Heidelberg 69120, Germany
| | - Harald Saathoff
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, Karlsruhe 76344, Germany
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