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| Titel |
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 |
| VerfasserIn |
W. Bader, T. Stavrakou, J.-F. Müller, S. Reimann, C. D. Boone, J. J. Harrison, O. Flock, B. Bovy, B. Franco, B. Lejeune, C. Servais, E. Mahieu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 11 ; Nr. 7, no. 11 (2014-11-21), S.3861-3872 |
| Datensatznummer |
250115957
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| Publikation (Nr.) |
 copernicus.org/amt-7-3861-2014.pdf |
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| Zusammenfassung |
| 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. |
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