Preprints
https://doi.org/10.5194/acp-2021-8
https://doi.org/10.5194/acp-2021-8

  29 Jan 2021

29 Jan 2021

Review status: this preprint is currently under review for the journal ACP.

The importance of sesquiterpene oxidation products for secondary organic aerosol formation in a spring-time hemi-boreal forest

Luis M. F. Barreira1,2, Arttu Ylisirniö1, Iida Pullinen1, Angela Buchholz1, Zijun Li1, Helina Lipp3, Heikki Junninen3, Steffen M. Noe4,5, Alisa Krasnova4,5, Dmitrii Krasnov4,5, Kaia Kask5, Eero Talts5, Ülo Niinemets5, Jose Ruiz-Jimenez6, and Siegfried Schobesberger1 Luis M. F. Barreira et al.
  • 1Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
  • 2Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, Finland
  • 3Laboratory of Environmental Physics, Department of Bio and Environmental Physics, University of Tartu, Estonia
  • 4Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Tartu, Estonia
  • 5Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, Estonia
  • 6Department of Chemistry and Institute for Atmospheric and Earth System Research, P.O. Box 55, FI-00014 University of Helsinki, Finland

Abstract. Secondary organic aerosols (SOA) formed from biogenic volatile organic compounds (BVOCs) constitute a significant fraction of atmospheric particulate matter and have been recognized to affect significantly the climate and air quality. Many laboratory and field experiments have studied SOA particle formation and growth in the recent years. Most of them have focused on a few monoterpenes and isoprene. However, atmospheric SOA particulate mass yields and chemical composition result from a much more complex mixture of oxidation products originating from many BVOCs, including terpenes other than isoprene and monoterpenes. Thus, a large uncertainty still remains regarding the contribution of BVOCs to SOA. In particular, organic compounds formed from sesquiterpenes have not been thoroughly investigated, and their contribution to SOA remains poorly characterized. In this study, a Filter Inlet for Gases and Aerosols (FIGAERO) combined with a high-resolution time-of-flight chemical ionization mass spectrometer (CIMS), with iodide ionization, was used for the simultaneous measurement of gas and particle phase atmospheric SOA. The aim of the study was to evaluate the relative contribution of sesquiterpene oxidation products to SOA in a spring-time hemi-boreal forest environment. Our results revealed that monoterpene and sesquiterpene oxidation products were the main contributors to SOA particles. The chemical composition of SOA particles was compared for times when either monoterpene or sesquiterpene oxidation products were dominant and possible key oxidation products for SOA particle formation were identified. Surprisingly, sesquiterpene oxidation products were the predominant fraction in the particle phase at some periods, while their gas phase concentrations remained much lower than those of monoterpene products. This can be explained by quick and effective partitioning of sesquiterpene products into the particle phase or their efficient removal by dry deposition. The SOA particle volatility determined from measured thermograms increased when the concentration of sesquiterpene oxidation products in SOA particles was higher than that of monoterpenes. Overall, this study demonstrates the important role of sesquiterpenes in atmospheric chemistry and suggests that the contribution of their products to SOA particles is being underestimated in comparison to the most studied terpenes.

Luis M. F. Barreira et al.

Status: open (until 26 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Luis M. F. Barreira et al.

Luis M. F. Barreira et al.

Viewed

Total article views: 205 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
151 52 2 205 13 2 3
  • HTML: 151
  • PDF: 52
  • XML: 2
  • Total: 205
  • Supplement: 13
  • BibTeX: 2
  • EndNote: 3
Views and downloads (calculated since 29 Jan 2021)
Cumulative views and downloads (calculated since 29 Jan 2021)

Viewed (geographical distribution)

Total article views: 281 (including HTML, PDF, and XML) Thereof 281 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 24 Feb 2021
Download
Short summary
We present results from PM1 atmospheric composition and concentration measurements performed at a spring-time hemi-boreal forest. Sesquiterpene mixing ratios and particle-phase concentrations of corresponding oxidation products were rapidly increasing in some early-mornings. The particle volatility suggested that condensable sesquiterpene oxidation products are rapidly formed in the atmosphere. The results revealed the importance of sesquiterpenes for secondary organic aerosol particulate mass.
Altmetrics