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Optical Properties of Secondary Organic Aerosol Produced by Nitrate Radical Oxidation of Biogenic Volatile Organic Compounds. | LitMetric

AI Article Synopsis

  • Nighttime oxidation of biogenic volatile organic compounds (BVOCs) by nitrate radicals leads to significant secondary organic aerosol (SOA) formation, impacting both natural and human-caused emissions.
  • A study analyzed the SOA produced from various BVOCs, using advanced techniques to examine their chemical composition and optical properties, which are essential for understanding their climatic effects.
  • The results showed that the SOA contained oxygenated organic nitrates that absorb light in the UV range and have a long atmospheric lifetime, suggesting they can influence radiative forcing and act as stable reservoirs for nitrogen oxides.

Article Abstract

Nighttime oxidation of biogenic volatile organic compounds (BVOCs) by nitrate radicals (NO·) 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 NO· 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) cavity-enhanced 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 β-pinene and α-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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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8023652PMC
http://dx.doi.org/10.1021/acs.est.0c06838DOI Listing

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