Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
7
23
2007
10.5194/acp-7-6075-2007
http://www.atmos-chem-phys.net/7/6075/2007/
http://www.atmos-chem-phys.net/7/6075/2007/acp-7-6075-2007.html
http://www.atmos-chem-phys.net/7/6075/2007/acp-7-6075-2007.pdf
6075
6084
2007-12-11
Balloon-borne radiometer measurements of Northern Hemisphere mid-latitude stratospheric HNO<sub>3</sub> profiles spanning 12 years
M. Toohey
mtoohey@atmosp.physics.utoronto.ca
B. M. Quine
K. Strong
P. F. Bernath
C. D. Boone
A. I. Jonsson
C. T. McElroy
K. A. Walker
D. Wunch
Department of Physics, University of Toronto, Toronto, ON, M5S 1A7, Canada
School of Engineering, York University, Toronto, ON, M3J 1P3, Canada
Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
Department of Chemistry, Waterloo University, Waterloo, ON, N2L 3G1, Canada
California Institute of Technology, Pasadena, CA, 91125, USA
Environment Canada, Downsview, ON, M3H 5T4, Canada
Low-resolution atmospheric thermal emission spectra collected by
balloon-borne radiometers over the time span of 1990–2002 are used
to retrieve vertical profiles of HNO<sub>3</sub>, CFC-11 and CFC-12
volume mixing ratios between approximately 10 and 35 km altitude.
All of the data analyzed have been collected from launches from a
Northern Hemisphere mid-latitude site, during late summer, when
stratospheric dynamic variability is at a minimum. The retrieval
technique incorporates detailed forward modeling of the instrument
and the radiative properties of the atmosphere, and obtains a best
fit between modeled and measured spectra through a combination of
onion-peeling and optimization steps. The retrieved HNO<sub>3</sub>
profiles are consistent over the 12-year period, and are consistent
with recent measurements by the Atmospheric Chemistry
Experiment-Fourier transform spectrometer satellite instrument. We
therefore find no evidence of long-term changes in the HNO<sub>3</sub>
summer mid-latitude profile, although the uncertainty of our
measurements precludes a conclusive trend analysis.
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