Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-6-12671-2006
http://www.atmos-chem-phys-discuss.net/6/12671/2006/
http://www.atmos-chem-phys-discuss.net/6/12671/2006/acpd-6-12671-2006.html
http://www.atmos-chem-phys-discuss.net/6/12671/2006/acpd-6-12671-2006.pdf
12671
12700
2006-12-05
Spatially resolved measurements of nitrogen dioxide in an urban environment using concurrent multi-axis differential optical absorption spectroscopy
R. J. Leigh
G. K. Corlett
U. Frieß
P. S. Monks
p.s.monks@leicester.ac.uk
EOS Group, Departments of Chemistry and Physics, University of Leicester, Leicester, UK
now at: University of Heidelberg, Heidelberg, Germany
A novel system using the technique of concurrent multi-axis
differential optical absorption spectroscopy system has been
developed and applied to the measurement of nitrogen dioxide in an
urban environment. Using five fixed telescopes, slant columns of
nitrogen dioxide, ozone, water vapour, and the oxygen dimer,
O<sub>4</sub>, are simultaneously retrieved in five vertically separated
viewing directions. The application of this remote sensing technique
in the urban environment is explored. Through, the application of
several simplifying assumptions a tropospheric concentration of
NO<sub>2</sub> is derived and compared with an urban background
in-situ chemiluminescence detector. The remote sensing and
in-situ techniques show good agreement. Owing to the high
time resolution of the measurements, the ability to image and
quantify plumes within the urban environment is demonstrated. The
CMAX-DOAS measurements provide a useful measure of overall NO<sub>2</sub>
concentrations on a city-wide scale.
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