Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
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2007
10.5194/acp-7-1275-2007
http://www.atmos-chem-phys.net/7/1275/2007/
http://www.atmos-chem-phys.net/7/1275/2007/acp-7-1275-2007.html
http://www.atmos-chem-phys.net/7/1275/2007/acp-7-1275-2007.pdf
1275
1292
2007-02-22
Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions
D. Wunch
debra@atmosp.physics.utoronto.ca
J. R. Taylor
D. Fu
P. Bernath
J. R. Drummond
C. Midwinter
K. Strong
K. A. Walker
Department of Physics, University of Toronto, Toronto, ON, M5S 1A7, Canada
Department of Chemistry, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, B3H 3J5, Canada
An intercomparison of three Fourier transform spectrometers (FTSs)
with significantly different resolutions is presented. The
highest-resolution instrument has a maximum optical path difference
of 250 cm, and the two lower-resolution instruments have
maximum optical path differences of 50 cm and 25 cm.
The results indicate that the two lower-resolution instruments can
retrieve total column amounts of O<sub>3</sub>, HCl, N<sub>2</sub>O
and CH<sub>4</sub> using the SFIT2 retrieval code with percent
differences from the high-resolution instrument generally better
than 4%. Total column amounts of the stratospheric species
(O<sub>3</sub> and HCl) have larger differences than those of
the tropospheric species (N<sub>2</sub>O and CH<sub>4</sub>). Instrument
line shape (ILS) information is found to be of critical importance
when retrieving total columns of stratospheric gases from the
lower-resolution instruments. Including the ILS information in the
retrievals significantly reduces the difference in total column
amounts between the three instruments. The remaining errors for
stratospheric species total column amounts can be attributed to the
lower sensitivity of the lower-resolution FTSs to the stratosphere.
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