Intercomparison of slant column measurements of NO2 and O4 by MAX-DOAS and zenith-sky UV and visible spectrometers

Howard K. Roscoe 1 Michel van Roozendael 2 C. Fayt 2 A. Du Piesanie 3 N. Abuhassan 4, 5 C. Adams 6 M. Akrami 6 A. Cede 4, 5 J. Chong 7 K. Clémer 2 U. Friess 8 M. Gil Ojeda 9 Florence Goutail 10 R. Graves 11 Alexandra Griesfeller 10 K. Grossmann 8 G. Hemerijckx 2 F. Hendrick 2 J. Herman 4, 5 C. Hermans 2 H. Irie 12 P. V. Johnston 13 Y. Kanaya 12 K. Kreher 13 R. Leigh 11 A. Merlaud 2 G. H. Mount 14 M. Navarro 9 H. Oetjen 15 Andrea Pazmino 10 M. Perez-Camacho 9 E. Peters 16 G. Pinardi 2 O. Puentedura 9 A. Richter 16 A. Schönhardt 16 R. Shaiganfar 17 E. Spinei 14 K. Strong 6 H. Takashima 12 T. Vlemmix 3 M. Vrekoussis 16 T. Wagner 17 F. Wittrock 16 M. Yela 9 S. Yilmaz 8 F. Boersma 3 J. Hains 3 M. Kroon 3 A. Piters 3 Y. J. Kim 7
Abstract : In June 2009, 22 spectrometers from 14 institutes measured tropospheric and stratospheric NO2 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 NO2 and O4 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 NO2, as previous intercomparisons were only for zenith instruments focussing on stratospheric NO2, with their longer heritage.
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Howard K. Roscoe, Michel van Roozendael, C. Fayt, A. Du Piesanie, N. Abuhassan, et al.. Intercomparison of slant column measurements of NO2 and O4 by MAX-DOAS and zenith-sky UV and visible spectrometers. Atmospheric Measurement Techniques, European Geosciences Union, 2010, 3 (6), pp.1629-1646. ⟨10.5194/amt-3-1629-2010⟩. ⟨hal-00539217⟩

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