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    Global Formaldehyde Products From the Ozone Mapping and Profiler Suite (OMPS) Nadir Mappers on Suomi NPP and NOAA-20

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    Authors
    Nowlan, C.R.
    González Abad, G.
    Kwon, H.-A.
    Ayazpour, Z.
    Chan Miller, C.
    Chance, K.
    Chong, H.
    Liu, X.
    O’Sullivan, E.
    Wang, H.
    Zhu, L.
    De Smedt, I.
    Jaross, G.
    Seftor, C.
    Sun, K.
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    Discipline
    Earth and related Environmental sciences
    Subject
    OMPS
    JPSS
    formaldehyde
    volatile organic compounds
    Suomi NPP
    NOAA-20
    Audience
    Scientific
    Date
    2023
    Metadata
    Show full item record
    Description
    We describe new publicly available, multi-year formaldehyde (HCHO) data records from the Ozone Mapping and Profiler Suite (OMPS) nadir mapper (NM) instruments on the Suomi NPP and NOAA-20 satellites. The OMPS-NM instruments measure backscattered UV light over the globe once per day, with spatial resolutions close to nadir of 50 × 50 km2 (OMPS/Suomi-NPP) and 17 × 17 km2 or 12 × 17 km2 (OMPS/NOAA-20). After a preliminary instrument line shape and wavelength calibration using on-orbit observations, we use the backscatter measurements in a direct spectral fit of radiances, in combination with a nadir reference spectrum collected over a clean area, to determine slant columns of HCHO. The slant columns are converted to vertical columns using air mass factors (AMFs) derived through scene-by-scene radiative transfer calculations. Finally, a correction is applied to account for background HCHO in the reference spectrum, as well as any remaining high-latitude biases. We investigate the consistency of the OMPS products from Suomi NPP and NOAA-20 using long-term monthly means over 12 geographic regions, and also compare the products with publicly available TROPOMI HCHO observations. OMPS/Suomi-NPP and OMPS/NOAA-20 monthly mean HCHO vertical columns are highly consistent (r = 0.98), with low proportional (2\%) and offset (2 × 1014 molecules cm−2) biases. OMPS HCHO monthly means are also well-correlated with those from TROPOMI (r = 0.92), although they are consistently 10\% ± 16\% larger in polluted regions (columns >8 × 1015 molecules cm−2). These differences result primarily from differences in AMFs.
    Citation
    Nowlan, C.R.; González Abad, G.; Kwon, H.-A.; Ayazpour, Z.; Chan Miller, C.; Chance, K.; Chong, H.; Liu, X.; O’Sullivan, E.; Wang, H.; Zhu, L.; De Smedt, I.; Jaross, G.; Seftor, C.; Sun, K. (2023). Global Formaldehyde Products From the Ozone Mapping and Profiler Suite (OMPS) Nadir Mappers on Suomi NPP and NOAA-20. , Earth and Space Science, Vol. 10, Issue 5, e2022EA002643, DOI: 10.1029/2022EA002643.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/10993
    doi: http://dx.doi.org/10.1029/2022EA002643
    scopus:
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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