Atmospheric Measurement Techniques Discussions
www.atmos-meas-tech-discuss.net
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1
2009
10.5194/amtd-2-265-2009
http://www.atmos-meas-tech-discuss.net/2/265/2009/
http://www.atmos-meas-tech-discuss.net/2/265/2009/amtd-2-265-2009.html
http://www.atmos-meas-tech-discuss.net/2/265/2009/amtd-2-265-2009.pdf
265
301
2009-02-05
Airborne multi-axis DOAS measurements of atmospheric trace gases on CARIBIC long-distance flights
B. Dix
barbara.dix@colorado.edu
C. A. M. Brenninkmeijer
U. Frieß
T. Wagner
U. Platt
Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
Max Planck Institute for Chemistry, Mainz, Germany
now at: Department of Chemistry and Biochemistry, University of Colorado, Boulder, USA
A DOAS (Differential Optical Absorption Spectroscopy) instrument was implemented and operated onboard a long-distance
passenger aircraft within the framework of the CARIBIC project (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container). The
instrument was designed to keep weight, size and power consumption low and
to comply with civil aviation regulations. It records spectra of scattered
light from three viewing directions (nadir, 10° above and below
horizon) using a miniaturized telescope system. The telescopes are
integrated in the main pylon of the inlet system which is mounted at the
belly of the aircraft. Fibre bundles transmit light from the telescopes to
spectrograph-detector units inside the DOAS container instrument. The latter
is part of the removable CARIBIC instrument container, which is installed
monthly on the aircraft for a series of measurement flights.
<br><br>
During 30 flight operations within three years, measurements of HCHO, HONO,
NO<sub>2</sub>, BrO, O<sub>3</sub> and the oxygen dimer O<sub>4</sub> were conducted. All of
these trace gases except BrO could be analysed with a 30 s time resolution.
HONO was detected for the first time in a deep convective cloud over central
Asia. BrO, NO<sub>2</sub> and O<sub>3</sub> could be observed in tropopause fold
regions, biomass burning signatures over South America could be seen and
measurements during ascent and descent provided information on boundary
layer trace gas profiles (e.g. NO<sub>2</sub> or HCHO).
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