| Title: | Comparison between Spatially Resolved Airborne Flux Measurements and Emission Inventories of Volatile Organic Compounds in Los Angeles |
| Author(s): | Pfannerstill EY; Arata C; Zhu Q; Schulze BC; Woods R; Harkins C; Schwantes RH; McDonald BC; Seinfeld JH; Bucholtz A; Cohen RC; Goldstein AH; |
| Address: | "Department of Environmental Science, Policy and Management, University of California at Berkeley, Berkeley 94720, California, United States. Department of Earth and Planetary Science, University of California at Berkeley, Berkeley 94720, California, United States. Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder 80305, Colorado, United States. Department of Environmental Science and Engineering, California Institute of Technology, Pasadena 91125, California, United States. Department of Meteorology, Naval Postgraduate School, Monterey 93943, California, United States. NOAA Chemical Sciences Laboratory, Boulder 80305, Colorado, United States. Department of Chemistry, University of California at Berkeley, Berkeley 94720, California, United States" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Los Angeles is a major hotspot for ozone and particulate matter air pollution in the United States. Ozone and PM(2.5) in this region have not improved substantially for the past decade, despite a reduction in vehicular emissions of their precursors, NO(x) and volatile organic compounds (VOCs). This reduction in 'traditional' sources has made the current emission mixture of air pollutant precursors more uncertain. To map and quantify emissions of a wide range of VOCs in this urban area, we performed airborne eddy covariance measurements with wavelet analysis. VOC fluxes measured include tracers for source categories, such as traffic, vegetation, and volatile chemical products (VCPs). Mass fluxes were dominated by oxygenated VOCs, with ethanol contributing approximately 29% of the total. In terms of OH reactivity and aerosol formation potential, terpenoids contributed more than half. Observed fluxes were compared with two commonly used emission inventories: the California Air Resources Board inventory and the combination of the Biogenic Emission Inventory System with the Fuel-based Inventory of Vehicle Emissions combined with Volatile Chemical Products (FIVE-VCP). The comparison shows mismatches regarding the amount, spatial distribution, and weekend effects of observed VOC emissions with the inventories. The agreement was best for typical transportation related VOCs, while discrepancies were larger for biogenic and VCP-related VOCs" |
| Keywords: | California air quality airborne emissions fluxes inventory volatile organic compounds; |
| Notes: | "PublisherPfannerstill, Eva Y Arata, Caleb Zhu, Qindan Schulze, Benjamin C Woods, Roy Harkins, Colin Schwantes, Rebecca H McDonald, Brian C Seinfeld, John H Bucholtz, Anthony Cohen, Ronald C Goldstein, Allen H eng 2023/10/04 Environ Sci Technol. 2023 Oct 4. doi: 10.1021/acs.est.3c03162" |
