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| Titel |
Airborne measurements of different trace gases during the AROMAT-2 campaign
with an Avantes spectrometer |
| VerfasserIn |
Tim Bösch, Andreas Meier, Anja Schönhardt, Enno Peters, Andreas Richter, Thomas Ruhtz, John Burrows |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127507
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| Publikation (Nr.) |
 EGU/EGU2016-7394.pdf |
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| Zusammenfassung |
| Differential Optical Absorption Spectroscopy (DOAS) is a well-known, versatile, and
frequently used technique for the analysis of trace gases within the atmosphere. Although
DOAS has been used for several decades, airborne DOAS has become more popular during
the last years because of the possibility of measuring in high lateral resolutions with the help
of imaging instruments.
Here, we present results of the AROMAT-2 campaign in Romania in summer 2015. The
introduced measurements were taken using a nadir viewing Avantes spectrometer on
board of a Cessna aircraft which flew over Bucharest and the Turceni power plant in
Romania.
The instrument covers the wavelength region of 287 – 551nm at a spectral resolution of
0.13nm and has a temporal resolution of 0.5s, translating to about 450m in flight direction at
3000m flight attitude. The field of view of the instrument was set to 8.1 degrees, resulting in a
pixel size across track of about 420m.
Compared to the imaging DOAS instrument AirMAP which was also operated from the
aircraft, the signal to noise ratio of the simple nadir viewing spectrometer is slightly
better, which allows an analysis of less abundant species and interesting spectral
features.
The results show a day-to-day variation of NO2 over the city of Bucharest as well as
spectral features over lakes in the city, which can be attributed to algae. Furthermore, we were
able to measure large emission plumes of NO2 and SO2 over the Turceni power plant, which
could be observed over long spatial distances.
In addition, the results from the Avantes instrument were used for comparison with
measurements of the imaging spectrometer AirMAP and good agreement was found,
providing independent verification of the imager data. |
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