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Preprints
https://doi.org/10.5194/acp-2020-267
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-267
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 Apr 2020

Submitted as: research article | 14 Apr 2020

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This preprint is currently under review for the journal ACP.

Oligomer and highly oxygenated organic molecule formation from oxidation of oxygenated monoterpenes emitted by California sage plants

Archit Mehra1, Jordan E. Krechmer2, Andrew T. Lambe2, Chinmoy Sarkar3, Farzaneh Khalaj3, Alex Guenther4, John Jayne2, Hugh Coe1, Douglas R. Worsnop2, Celia Faiola3,5, Manjula R. Canagaratna2, and Leah Williams2 Archit Mehra et al.
  • 1Centre for Atmospheric Science, School of Earth and Environmental Sciences, The University of Manchester, Manchester, UK
  • 2Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, Massachusetts, USA
  • 3Department of Ecology and Evolutionary Biology, University of California, Irvine, Irvine, California, USA
  • 4Department of Earth System Science, University of California Irvine, Irvine, California, USA
  • 5Department of Chemistry, University of California, Irvine, Irvine, California, USA

Abstract. Plants emit a diverse range of biogenic volatile organic compounds (BVOC) whose oxidation leads to secondary organic aerosol (SOA) formation. The majority of studies of biogenic SOA have focused on single or simple multi-component BVOC mixtures thought to be representative of Northern Hemispheric deciduous or mixed forest conditions. Gaps remain in our understanding of SOA formation from complex mixtures of real plant emissions in other environments. Towards the goal of understanding SOA in other regions, we conducted the first comprehensive study of SOA from oxygenated monoterpenes. These are the dominant emissions from the most common plant species in southern California’s coastal sage ecosystem: black sage (Salvia mellifera) and California sagebrush (Artemisia californica).

Emissions from sage plants, and single compounds representing their major emissions (camphor, camphene and eucalyptol), were oxidised in an Aerodyne potential aerosol mass oxidation flow reactor (PAM-OFR). The chemical composition of SOA was characterised using a high-resolution time-of-flight iodide-anion chemical-ionization mass spectrometer equipped with a Filter Inlet for Gases and AEROsols (FIGAERO-I-HR-ToF-CIMS) under low and medium-NOx conditions.

SOA from oxygenated monoterpenes showed higher order oligomer content and a greater presence of highly oxygenated organic molecules (HOM) than non-oxygenated monoterpenes, with HOM contributing 27–47 % and 12–14 % of SOA product signal from oxygenated and non-oxygenated monoterpenes, respectively. This study highlights the potential importance of oxygenated monoterpene emissions for SOA formation in woody shrub ecosystems.

Archit Mehra et al.

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Archit Mehra et al.

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Short summary
Emissions of volatile organic compounds (VOCs) from plants are important for tropospheric ozone and secondary organic aerosol (SOA) formation. Real plant emissions are much more diverse than the few proxies widely used for studies of plant SOA. Here we present the first study of SOA from California Sage plants and oxygenated monoterpenes representing their major emissions. We identify SOA products and show the importance of formation of highly oxygenated organic molecules (HOM) and oligomers.
Emissions of volatile organic compounds (VOCs) from plants are important for tropospheric ozone...
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