Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-8-5847-2008
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5847
5899
2008-03-19
Odin stratospheric proxy NO<sub>y</sub> measurements and climatology
S. Brohede
C. A. McLinden
J. Urban
C. S. Haley
A. I. Jonsson
D. Murtagh
Department of Radio and Space Science, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
Environment Canada, 4905 Dufferin Street, Toronto, Ontario, M3H 5T4, Canada
Centre for Research in Earth and Space Science, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada
Department of Physics, University of Toronto, M5S 1A7 Toronto, Ontario, Canada
Five years of OSIRIS (Optical Spectrograph and InfraRed Imager System) NO<sub>2</sub>
and SMR (Sub-Millimetre Radiometer) HNO<sub>3</sub> observations from the Odin satellite,
combined with data from a photochemical box model, have been used to construct a
stratospheric proxy NO<sub>y</sub> data set including the gases: NO, NO<sub>2</sub>, HNO<sub>3</sub>, 2×N<sub>2</sub>O<sub>5</sub> and CIONO<sub>2</sub>.
This Odin NO<sub>y</sub> climatology is based on all daytime measurements and contains monthly mean and standard
deviation, expressed as mixing ratio or number density, as function of latitude or equivalent latitude
(5° bins) on 17 vertical layers (altitude, pressure or potential temperature) between 14 and 46 km.
Comparisons with coincident NO<sub>y</sub> profiles from the Atmospheric Chemistry Experiment–Fourier Transform
Spectrometer (ACE-FTS) instrument were used to evaluate several methods to combine Odin observations with
model data. This comparison indicates that the most appropriate merging technique uses OSIRIS measurements
of NO<sub>2</sub>, scaled with model NO/NO<sub>2</sub> ratios, to estimate NO. The sum of 2×N<sub>2</sub>O<sub>5</sub> and CIONO<sub>2</sub>
is estimated from uncertainty-based weighted averages of scaled observations of SMR HNO<sub>3</sub> and OSIRIS NO<sub>2</sub>.
Comparisons with ACE-FTS suggest the precision (random error) and accuracy (systematic error) of Odin NO<sub>y</sub>
profiles are about 15% and 20%, respectively. Further comparisons between Odin and the Canadian Middle Atmosphere
Model (CMAM) show agreement to within 20% and 2 ppb throughout most of the stratosphere except in the polar vortices.
A particularly large disagreement within the Antarctic vortex in the
upper stratosphere during spring indicates too strong descent of air in CMAM. The combination of
good temporal and spatial coverage, a relatively long data record, and good accuracy and precision
make this a valuable NO<sub>y</sub> product for various atmospheric studies and model assessments.
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