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    Improved TROPOMI HCHO Column Validation Using Dual-Scan MAX-DOAS Retrievals

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    Authors
    Dimitropoulou, E.
    Hendrick, F.
    Friedrich, M.M.
    Tack, F.
    Pinardi, G.
    Merlaud, A.
    Fayt, C.
    Hermans, C.
    Van Roozendael, M.
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    Discipline
    Earth and related Environmental sciences
    Subject
    Formaldehyde
    MAX-DOAS
    satellite
    TROPOMI
    validation
    Audience
    Scientific
    Date
    2021
    Metadata
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    Description
    Formaldehyde (HCHO) is the most abundant aldehyde in the atmosphere. HCHO ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements have been performed in Uccle, Belgium during one year and a half from May 2018 to December 2019. The MAX-DOAS instrument was measuring in a dual-scan viewing mode consisting of one scan in elevation in a main azimuthal direction followed by an azimuth scan at a fixed low elevation angle. Aerosols and HCHO vertical profiles are retrieved in the main azimuthal direction by applying a profile inversion algorithm based on the Optimal Estimation Method. With the aid of these vertical profiles and the dual-scan MAX-DOAS retrieval strategy, near-surface HCHO concentrations and columns are retrieved in all directions of the azimuth scan. This ground-based dataset is then used for two main purposes: (1) the characterization of the HCHO horizontal distribution around the station and (2) the validation of HCHO columns measured by the TROPOMI satellite instrument over the Brussels area. This study reveals that (1) the HCHO horizontal distribution differs per season and (2) the use of dual-scan MAX-DOAS measurements improves the TROPOMI HCHO column validation results.
    Citation
    Dimitropoulou, E.; Hendrick, F.; Friedrich, M.M.; Tack, F.; Pinardi, G.; Merlaud, A.; Fayt, C.; Hermans, C.; Van Roozendael, M. (2021). Improved TROPOMI HCHO Column Validation Using Dual-Scan MAX-DOAS Retrievals. , 2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 11-16 July 2021, Brussels, Belgium, 8026-8029, DOI: 10.1109/IGARSS47720.2021.9553326.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/8065
    doi: http://dx.doi.org/10.1109/IGARSS47720.2021.9553326
    scopus:
    Type
    Article
    Peer-Review
    No
    Language
    eng
    Links
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