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    Inferring Changes in Summertime Surface Ozone–NOx–VOC Chemistry over U.S. Urban Areas from Two Decades of Satellite and Ground-Based Observations

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    Authors
    Jin, X.
    Fiore, A.
    Boersma, K.F.
    De Smedt, I.
    Valin, L.
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    Discipline
    Earth and related Environmental sciences
    Subject
    Redox reactions
    Precursors
    Mathematical methods
    Particulate matter
    Volatile organic compounds
    Audience
    Scientific
    Date
    2020
    Metadata
    Show full item record
    Description
    Urban ozone (O3) formation can be limited by NOx, VOCs, or both, complicating the design of effective O3 abatement plans. A satellite-retrieved ratio of formaldehyde to NO2 (HCHO/NO2), developed from theory and modeling, has previously been used to indicate O3 formation chemistry. Here, we connect this space-based indicator to spatiotemporal variations in O3 recorded by on-the-ground monitors over major U.S. cities. High-O3 events vary nonlinearly with OMI HCHO and NO2, and the transition from VOC-limited to NOx-limited O3 formation regimes occurs at higher HCHO/NO2 value (3 to 4) than previously determined from models, with slight intercity variations. To extend satellite records back to 1996, we develop an approach to harmonize observations from GOME and SCIAMACHY that accounts for differences in spatial resolution and overpass time. Two-decade (1996–2016) multisatellite HCHO/NO2 captures the timing and location of the transition from VOC-limited to NOx-limited O3 production regimes in major U.S. cities, which aligns with the observed long-term changes in urban–rural gradient of O3 and the reversal of O3 weekend effect. Our findings suggest promise for applying space-based HCHO/NO2 to interpret local O3 chemistry, particularly with the new-generation satellite instruments that offer finer spatial and temporal resolution.
    Citation
    Jin, X.; Fiore, A.; Boersma, K.F.; De Smedt, I.; Valin, L. (2020). Inferring Changes in Summertime Surface Ozone–NOx–VOC Chemistry over U.S. Urban Areas from Two Decades of Satellite and Ground-Based Observations. , Environmental Science & Technology, Vol. 54, Issue 11, 6518-6529, DOI: 10.1021/acs.est.9b07785.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7718
    doi: http://dx.doi.org/10.1021/acs.est.9b07785
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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