Impacts of Emissions of C2‐C5 Alkanes From the U.S. Oil and Gas Sector on Ozone and Other Secondary Species
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Impacts of Emissions of C2‐C5 Alkanes From the U.S. Oil and Gas Sector on Ozone and Other Secondary Species

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  • Journal Title:
    Journal of Geophysical Research: Atmospheres
  • Description:
    Inside many U.S. oil and gas-producing regions, the oil and gas sector dominates local anthropogenic emission fluxes of C2-C5 alkanes. Here, we present a detailed analysis of the impact of these emissions on secondary species production over the continental United States using the GEOS-Chem model. Oil- and gas-producing areas in the central United States show the highest summertime surface ozone (O3) enhancements due to oil and gas C2-C5 alkane emissions. The Colorado Front Range is the most impacted 8-hr O3 non-attainment area in the United States with 3-hr daytime instantaneous O3 enhancements >4 ppb. From three selected non-attainment areas, the Colorado Front Range has (1) the lowest monthly mean VOC reactivity (1.5 s−1); (2) the highest percent contribution of oil and gas sources (52%) to calculated VOC reactivity; and (3) the largest relative increases in PAN (peroxyacetyl nitrate), PPN (peroxypropionyl nitrate), and >C4 alkyl nitrates. Enhanced abundances of PAN, PPN, and >C4 alkyl nitrates have the potential to perturb remote O3 production through increased NOx export to remote regions via PAN chemistry. Globally, simulated C2-C5 alkane emissions from the U.S. oil and gas sector contribute 0.5 Tg (~0.17%) to the tropospheric O3 burden with a ~0.27% contribution in the Northern Hemisphere.
  • Source:
    JGR Atmospheres 126(1): e2019JD031935
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