| Title: | Chemical Characterization of Highly Functionalized Organonitrates Contributing to Night-Time Organic Aerosol Mass Loadings and Particle Growth |
| Author(s): | Huang W; Saathoff H; Shen X; Ramisetty R; Leisner T; Mohr C; |
| Address: | "Institute of Meteorology and Climate Research , Karlsruhe Institute of Technology , Eggenstein-Leopoldshafen , 76344 , Germany. Institute of Geography and Geoecology, Working Group for Environmental Mineralogy and Environmental System Analysis , Karlsruhe Institute of Technology , Karlsruhe , 76131 , Germany. Institute of Environmental Physics , Heidelberg University , Heidelberg , 69120 , Germany. Department of Environmental Science and Analytical Chemistry , Stockholm University , Stockholm , 11418 , Sweden" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Reactions of volatile organic compounds (VOC) with NO(3) radicals and of reactive intermediates of oxidized VOC with NO (x) can lead to the formation of highly functionalized organonitrates (ON). We present quantitative and chemical information on ON contributing to high night-time organic aerosol (OA) mass concentrations measured during July-August 2016 in a rural area in southwest Germany. A filter inlet for gases and aerosols coupled to a high-resolution time-of-flight chemical ionization mass spectrometer (FIGAERO-HR-ToF-CIMS) was used to analyze the molecular composition of ON in both the gas and particle phase. We find larger contributions of ON to OA mass during the night. Identified ON are highly functionalized, with 4 to 12 oxygen atoms. The diel patterns of ON compounds with 5, 7, 10, or 15 carbon atoms per molecule vary, indicating a corresponding behavior of their potential precursor VOC. The temporal behavior of ON after sunset correlates with that of the number concentration of ultrafine particles, indicating a potential role of ON in night-time new particle formation (NPF) regularly observed at this location. We estimate an ON contribution of 18-25% to the mass increase of newly formed particles after sunset. Our study provides insights into the chemical composition of highly functionalized ON in the rural atmosphere and the role of anthropogenic emissions for night-time SOA formation in an area where biogenic VOC emissions dominate" |
| Keywords: | Aerosols *Atmosphere Gases Germany *Volatile Organic Compounds; |
| Notes: | "MedlineHuang, Wei Saathoff, Harald Shen, Xiaoli Ramisetty, Ramakrishna Leisner, Thomas Mohr, Claudia eng Research Support, Non-U.S. Gov't 2019/01/08 Environ Sci Technol. 2019 Feb 5; 53(3):1165-1174. doi: 10.1021/acs.est.8b05826. Epub 2019 Jan 22" |
