Atmospheric Measurement Techniques Discussions
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2010
10.5194/amtd-3-3383-2010
http://www.atmos-meas-tech-discuss.net/3/3383/2010/
http://www.atmos-meas-tech-discuss.net/3/3383/2010/amtd-3-3383-2010.html
http://www.atmos-meas-tech-discuss.net/3/3383/2010/amtd-3-3383-2010.pdf
3383
3423
2010-08-13
Intercomparison of slant column measurements of NO<sub>2</sub> and O<sub>4</sub> by MAX-DOAS and zenith-sky UV and visible spectrometers
H. K. Roscoe
M. Van Roozendael
C. Fayt
A. du Piesanie
N. Abuhassan
C. Adams
M. Akrami
A. Cede
J. Chong
K. Clémer
U. Friess
M. Gil Ojeda
F. Goutail
R. Graves
A. Griesfeller
K. Grossmann
G. Hemerijckx
F. Hendrick
J. Herman
C. Hermans
H. Irie
P. V. Johnston
Y. Kanaya
K. Kreher
R. Leigh
A. Merlaud
G. H. Mount
M. Navarro
H. Oetjen
A. Pazmino
M. Perez-Camacho
E. Peters
G. Pinardi
O. Puentedura
A. Richter
A. Schönhardt
R. Shaiganfar
E. Spinei
K. Strong
H. Takashima
T. Vlemmix
M. Vrekoussis
T. Wagner
F. Wittrock
M. Yela
S. Yilmaz
F. Boersma
J. Hains
M. Kroon
A. Piters
British Antarctic Survey, Cambridge, UK
BIRA-IASB, Brussels, Belgium
KNMI, De Bilt, Netherlands
University of Maryland, Baltimore County, and NASA/Goddard Space Flight Center, USA
Department of Physics, University of Toronto, Ontario, Canada
INTA, Madrid, Spain
Gwangju Institute of Science and Technology (GIST), Republic of Korea
Institute of Environmental Physics, University of Heidelberg, Germany
LATMOS (CNRS/UVSQ/UPMC), Guyancourt, France
Department of Chemistry, University of Leicester, UK
Research Institute for Global Change, JAMSTEC, Yokohama, Japan
NIWA, Lauder, New Zealand
Laboratory for Atmospheric Research, Washington State University, Pullman WA, USA
School of Chemistry, University of Leeds, UK
Institute of Environmental Physics, University of Bremen, Germany
Max Planck Institute for Chemistry, Mainz, Germany
In June 2009, 22 spectrometers from 14 institutes measured
tropospheric and stratospheric NO<sub>2</sub> from the ground for more than
11 days during the Cabauw Intercomparison campaign of Nitrogen Dioxide
measuring Instruments (CINDI), at Cabauw, NL (51.97° N,
4.93° E). All visible instruments used a common wavelength
range and set of cross sections for the spectral analysis. Most of the
instruments were of the multi-axis design with analysis by
differential spectroscopy software (MAX-DOAS), whose non-zenith slant
columns were compared by examining slopes of their least-squares
straight line fits to mean values of a selection of instruments, after
taking 30-min averages. Zenith slant columns near twilight were
compared by fits to interpolated values of a reference instrument,
then normalised by the mean of the slopes of the best instruments. For
visible MAX-DOAS instruments, the means of the fitted slopes for
NO<sub>2</sub> and O<sub>4</sub> of all except one instrument were within 10%
of unity at almost all non-zenith elevations, and most were within
5%. Values for UV MAX-DOAS instruments were almost as good, being
12% and 7%, respectively. For visible instruments at zenith near
twilight, the means of the fitted slopes of all instruments were
within 5% of unity. This level of agreement is as good as that of previous intercomparisons, despite the site not being ideal for zenith twilight measurements. It bodes well for
the future of measurements of tropospheric NO<sub>2</sub>, as previous
intercomparisons were only for zenith instruments focussing on
stratospheric NO<sub>2</sub>, with their longer heritage.
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