| Title: | Optical Properties of Secondary Organic Aerosol Produced by Nitrate Radical Oxidation of Biogenic Volatile Organic Compounds |
| Author(s): | He Q; Tomaz S; Li C; Zhu M; Meidan D; Riva M; Laskin A; Brown SS; George C; Wang X; Rudich Y; |
| Address: | "Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel. Univ Lyon, Universite Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626 Villeurbanne, France. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China. University of Chinese Academy of Sciences, Beijing 100049, China. Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States. Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, Colorado 80305, United States. Department of Chemistry, University of Colorado, 216 UCB, Boulder, Colorado 80309, United States. Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Print) 0013-936X (Linking) |
| Abstract: | "Nighttime oxidation of biogenic volatile organic compounds (BVOCs) by nitrate radicals (NO(3).) 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(3). 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 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" |
| Keywords: | Aerosols *Air Pollutants/analysis Gas Chromatography-Mass Spectrometry Monoterpenes Nitrates Nitrogen Oxides *Volatile Organic Compounds; |
| Notes: | "MedlineHe, Quanfu Tomaz, Sophie Li, Chunlin Zhu, Ming Meidan, Daphne Riva, Matthieu Laskin, Alexander Brown, Steven S George, Christian Wang, Xinming Rudich, Yinon eng Research Support, Non-U.S. Gov't 2021/02/18 Environ Sci Technol. 2021 Mar 2; 55(5):2878-2889. doi: 10.1021/acs.est.0c06838. Epub 2021 Feb 17" |
