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    Long-term evolution and seasonal modulation of methanol above Jungfraujoch (46.5° N, 8.0° E): optimisation of the retrieval strategy, comparison with model simulations and independent observations

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    Authors
    Bader, W.
    Stavrakou, T.
    Muller, J.-F.
    Reimann, S.
    Boone, C.D.
    Harrison, J.J.
    Flock, O.
    Bovy, B.
    Franco, B.
    Lejeune, B.
    Servais, C.
    Mahieu, E.
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    Discipline
    Earth and related Environmental sciences
    Subject
    absorption
    atmospheric chemistry
    in situ measurement
    long-term change
    methanol
    model validation
    optimization
    ozone
    seasonal variation
    stratosphere
    troposphere
    Bern [Switzerland]
    Jungfraujoch
    Switzerland
    Audience
    Scientific
    Date
    2014
    Metadata
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    Description
    Methanol (CH3OH) is the second most abundant organic compound in the Earth's atmosphere after methane. In this study, we present the first long-term time series of methanol total, lower tropospheric and upper tropospheric–lower stratospheric partial columns derived from the analysis of high resolution Fourier transform infrared solar spectra recorded at the Jungfraujoch station (46.5° N, 3580 m a.s.l.). The retrieval of methanol is very challenging due to strong absorptions of ozone in the region of the selected υ8 band of CH3OH. Two wide spectral intervals have been defined and adjusted in order to maximise the information content. Methanol does not exhibit a significant trend over the 1995–2012 time period, but a strong seasonal modulation characterised by maximum values and variability in June–July, minimum columns in winter and a peak-to-peak amplitude of 130%. Analysis and comparisons with in situ measurements carried out at the Jungfraujoch and ACE-FTS (Atmospheric Chemistry Experiment-Fourier transform spectrometer) occultations have been performed. The total and lower tropospheric columns are also compared with IMAGESv2 model simulations. There is no systematic bias between the observations and IMAGESv2 but the model underestimates the peak-to-peak amplitude of the seasonal modulations.
    Citation
    Bader, W.; Stavrakou, T.; Muller, J.-F.; Reimann, S.; Boone, C.D.; Harrison, J.J.; Flock, O.; Bovy, B.; Franco, B.; Lejeune, B.; Servais, C.; Mahieu, E. (2014). Long-term evolution and seasonal modulation of methanol above Jungfraujoch (46.5° N, 8.0° E): optimisation of the retrieval strategy, comparison with model simulations and independent observations. , Atmospheric Measurement Techniques, Vol. 7, Issue 11, 3861-3872, DOI: 10.5194/amt-7-3861-2014.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/2827
    doi: http://dx.doi.org/10.5194/amt-7-3861-2014
    scopus: 2-s2.0-84911944563
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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