Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 55, Issue 5, Pages 2878-2889Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c06838
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Funding
- Israel Science Foundation (ISF) [3205/19]
- National Natural Science Foundation of China (NSFC) [41961144029/41530641]
- US-Israel Binational Science Foundation (BSF) [2016093]
- Israel Ministry of Science [3-14010]
- University of Lyon through the Breakthrough project WANTED
- Koshland Foundation
- Center for Planetary Sciences, Weizmann Institute of Science
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The nighttime oxidation of biogenic volatile organic compounds (BVOCs) by nitrate radicals leads to the formation of substantial secondary organic aerosol (SOA) containing oxygenated organic nitrates (ONs), which can absorb and scatter solar radiation in the atmosphere. The SOA generated has an atmospheric photochemical bleaching lifetime of >6.2 h, suggesting that some ONs may serve as stable nitrogen oxide sinks in the atmosphere.
Nighttime oxidation of biogenic volatile organic compounds (BVOCs) by nitrate radicals (NO3 center dot) represents one of the most important interactions between anthropogenic and natural emissions, leading to substantial secondary organic aerosol (SOA) formation. The direct climatic effect of such SOA cannot be quantified because its optical properties and atmospheric fate are poorly understood. In this study, we generated SOA from the NO3 center dot oxidation of a series BVOCs including isoprene, monoterpenes, and sesquiterpenes. The SOA were subjected to comprehensive online and offline chemical composition analysis using high-resolution mass spectrometry and optical properties measurements using a novel broadband (315-650 nm) cavityenhanced spectrometer, which covers the wavelength range needed to understand the potential contribution of the SOA to direct radiative forcing. The SOA contained a significant fraction of oxygenated organic nitrates (ONs), consisting of monomers and oligomers that are responsible for the detected light absorption in the 315-400 nm range. The SOA created from beta-pinene and alpha-humulene was further photochemically aged in an oxidation flow reactor. The SOA has an atmospheric photochemical bleaching lifetime of >6.2 h, indicating that some of the ONs in the SOA may serve as atmosphere-stable nitrogen oxide sinks or reservoirs and will absorb and scatter incoming solar radiation during the daytime.
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