Portal de Periódicos da CAPES

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

2010; Copernicus Publications; Volume: 3; Issue: 6 Linguagem: Inglês

10.5194/amt-3-1629-2010

1867-8548

H. K. Roscoe, M. Van Roozendael, C. Fayt, A. du Piesanie, Nader Abuhassan, C. Adams, M. Akrami, Alexander Cede, Jihyo Chong, K. Clémer, Udo Frieß, Manuel Gil Ojeda, F. Goutail, Rosemarie Graves, A. Griesfeller, Katja Großmann, G. Hemerijckx, F. Hendrick, J. R. Herman, Christian Hermans, Hitoshi Irie, P. V. Johnston, Yugo Kanaya, K. Kreher, R. Leigh, Alexis Merlaud, G. H. Mount, Mónica Navarro-Comas, H. Oetjen, Andréa Pazmiño, M. Perez-Camacho, Enno Peters, Gaïa Pinardi, Olga Puentedura, Andreas Richter, Anja Schönhardt, Reza Shaiganfar, E. Spinei, Kimberly Strong, Hisahiro Takashima, Tim Vlemmix, Mihalis Vrekoussis, Thomas Wagner, F. Wittrock, Margarita Yela, S. Yilmaz, K. F. Boersma, J. Hains, M. Kroon, Ankie Piters, Yoon Jun Kim,

Atmospheric chemistry and aerosols

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.