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    Ground-based FTIR and MAX-DOAS observations of formaldehyde at Réunion Island and comparisons with satellite and model data

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    Authors
    Vigouroux, C.
    Hendrick, F.
    Stavrakou, T.
    Dils, B.
    De Smedt, I.
    Hermans, C.
    Merlaud, A.
    Scolas, F.
    Senten, C.
    Vanhaelewyn, G.
    Fally, S.
    Carleer, M.
    Metzger, J.-M.
    Müller, J.-F.
    Van Roozendael, M.
    De Mazière, M.
    Show allShow less
    Discipline
    Earth and related Environmental sciences
    Subject
    annual cycle
    atmospheric chemistry
    atmospheric transport
    comparative study
    computer simulation
    concentration (composition)
    dispersion
    diurnal variation
    formaldehyde
    FTIR spectroscopy
    ground-based measurement
    hydroxyl radical
    Lagrangian analysis
    numerical model
    particulate flux
    sampling bias
    satellite data
    sensitivity analysis
    troposphere
    Madagascar
    Mascarene Islands
    Reunion
    Audience
    Scientific
    Date
    2009
    Metadata
    Show full item record
    Description
    Formaldehyde (HCHO) columns have been retrieved from ground-based Fourier transform infrared (FTIR) campaign measurements in 2004 and 2007 and from UV-Visible MAX-DOAS measurements in 2004-2005 at the NDACC site of Réunion Island (21° S, 55° E). The FTIR and MAX-DOAS daily mean formaldehyde total columns are intercompared in their common measurement period, from August to October 2004. The ground-based data are also compared to correlative SCIAMACHY data. The comparisons account for the vertical sensitivity differences of the data sets, by including their respective averaging kernels. Complete error budgets are also presented. The FTIR and MAX-DOAS daily mean total columns agree very well: no significant bias is observed and the standard deviation of the comparisons is only 8%. Both FTIR and MAX-DOAS HCHO total columns are in good agreement with SCIAMACHY values in the 2004-2005 period, with standard deviations of 21% and 31%, respectively. The same seasonal cycle is observed by the different instruments, with a minimum in austral winter and a maximum in February-March. The FTIR and MAX-DOAS data are confronted with HCHO columns calculated by a global CTM, the IMAGES model. The model underestimates the HCHO columns by 23-29% in comparison with FTIR, and by 15% in comparison with DOAS. This bias might have multiple causes, including an underestimation of OH concentrations in the model (as indicated by a sensitivity study using prescribed OH fields) and/or an underestimated contribution of large-scale transport of HCHO precursors from Madagascar. The latter hypothesis is comforted by the large observed day-to-day variability of HCHO columns, and by the observation that the peak values of FTIR columns can often be associated with free tropospheric transport patterns from source regions over Madagascar to Réunion Island, according to simulations performed with the Lagrangian particle dispersion model FLEXPART.
    Citation
    Vigouroux, C.; Hendrick, F.; Stavrakou, T.; Dils, B.; De Smedt, I.; Hermans, C.; Merlaud, A.; Scolas, F.; Senten, C.; Vanhaelewyn, G.; Fally, S.; Carleer, M.; Metzger, J.-M.; Müller, J.-F.; Van Roozendael, M.; De Mazière, M. (2009). Ground-based FTIR and MAX-DOAS observations of formaldehyde at Réunion Island and comparisons with satellite and model data. , Atmospheric Chemistry and Physics, Vol. 9, Issue 24, 9523-9544,
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/3270
    scopus: 2-s2.0-72849137431
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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