4.4 Article

Secondary Organic Aerosol Formation from Healthy and Aphid-Stressed Scots Pine Emissions

期刊

ACS EARTH AND SPACE CHEMISTRY
卷 3, 期 9, 页码 1756-1772

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsearthspacechem.9b00118

关键词

secondary organic aerosol; volatile organic compounds; atmospheric chemistry; plant stress; acetate-CIMS

资金

  1. European Research Council [ERC-StG-QAPPA 335478]
  2. Academy of Finland [259005, 307331, 299544]
  3. University of Eastern Finland (EPHB Doctoral Program)
  4. Academy of Finland (AKA) [259005] Funding Source: Academy of Finland (AKA)

向作者/读者索取更多资源

One barrier to predicting biogenic secondary organic aerosol (SOA) formation in a changing climate can be attributed to the complex nature of plant volatile emissions. Plant volatile emissions are dynamic over space and time, and change in response to environmental stressors. This study investigated SOA production from emissions of healthy and aphid-stressed Scots pine saplings via dark ozonolysis and photooxidation chemistry. Laboratory experiments using a batch reaction chamber were used to investigate SOA production from different plant volatile mixtures. The volatile mixture from healthy plants included monoterpenes, aromatics, and a small amount of sesquiterpenes. The biggest change in the volatile mixture for aphid-stressed plants was a large increase (from 1.4 to 7.9 ppb) in sesquiterpenes-particularly acyclic sesquiterpenes, such as the farnesene isomers. Acyclic sesquiterpenes had different effects on SOA production depending on the chemical mechanism. Farnesenes suppressed SOA formation from ozonolysis with a 9.7-14.6% SOA mass yield from healthy plant emissions and a 6.9-10.4% SOA mass yield from aphid-stressed plant emissions. Ozonolysis of volatile mixtures containing more farnesenes promoted fragmentation reactions, which produced higher volatility oxidation products. In contrast, plant volatile mixtures containing more farnesenes did not appreciably change SOA production from photooxidation. SOA mass yields ranged from 10.8 to 23.2% from healthy plant emissions and 17.8-26.8% for aphid-stressed plant emissions. This study highlights the potential importance of acyclic terpene chemistry in a future climate regime with an increased presence of plant stress volatiles.

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