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    Evaluating a Space-Based Indicator of Surface Ozone-NOx-VOC Sensitivity Over Midlatitude Source Regions and Application to Decadal Trends

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    Authors
    Jin, X.
    Fiore, A.M.
    Murray, L.T.
    Valin, L.C.
    Lamsal, L.N.
    Duncan, B.
    Boersma, K.F.
    De Smedt, I.
    Abad, G.G.
    Chance, K.
    Tonnesen, G.S.
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    Discipline
    Earth and related Environmental sciences
    Subject
    air quality
    atmospheric pollution
    formaldehyde
    nitric oxide
    ozone
    trend analysis
    troposphere
    urban area
    volatile organic compound
    England
    London [England]
    New York [United States]
    Seoul [South Korea]
    South Korea
    United Kingdom
    United States
    Audience
    Scientific
    Date
    2017
    Metadata
    Show full item record
    Description
    Determining effective strategies for mitigating surface ozone (O3) pollution requires knowledge of the relative ambient concentrations of its precursors, NOx, and VOCs. The space-based tropospheric column ratio of formaldehyde to NO2 (FNR) has been used as an indicator to identify NOx-limited versus NOx-saturated O3 formation regimes. Quantitative use of this indicator ratio is subject to three major uncertainties: (1) the split between NOx-limited and NOx-saturated conditions may shift in space and time, (2) the ratio of the vertically integrated column may not represent the near-surface environment, and (3) satellite products contain errors. We use the GEOS-Chem global chemical transport model to evaluate the quantitative utility of FNR observed from the Ozone Monitoring Instrument over three northern midlatitude source regions. We find that FNR in the model surface layer is a robust predictor of the simulated near-surface O3 production regime. Extending this surface-based predictor to a column-based FNR requires accounting for differences in the HCHO and NO2 vertical profiles. We compare four combinations of two OMI HCHO and NO2 retrievals with modeled FNR. The spatial and temporal correlations between the modeled and satellite-derived FNR vary with the choice of NO2 product, while the mean offset depends on the choice of HCHO product. Space-based FNR indicates that the spring transition to NOx-limited regimes has shifted at least a month earlier over major cities (e.g., New York, London, and Seoul) between 2005 and 2015. This increase in NOx sensitivity implies that NOx emission controls will improve O3 air quality more now than it would have a decade ago.
    Citation
    Jin, X.; Fiore, A.M.; Murray, L.T.; Valin, L.C.; Lamsal, L.N.; Duncan, B.; Boersma, K.F.; De Smedt, I.; Abad, G.G.; Chance, K.; Tonnesen, G.S. (2017). Evaluating a Space-Based Indicator of Surface Ozone-NOx-VOC Sensitivity Over Midlatitude Source Regions and Application to Decadal Trends. , Journal of Geophysical Research: Atmospheres, Vol. 122, Issue 19, 10439-10461, DOI: 10.1002/2017JD026720.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/6325
    doi: http://dx.doi.org/10.1002/2017JD026720
    scopus: 2-s2.0-85030311795
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
    NewsHelpdeskBELSPO OA Policy

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