The Cabauw Intercomparison campaign for Nitrogen Dioxide measuring Instruments (CINDI): design, execution, and early results

A. J. M. Piters 1 K. F. Boersma 2 M. Kroon 1 J. C. Hains 3 M. van Roozendael 4 F. Wittrock 5 N. Abuhassan 6 C. Adams 7 M. Akrami 7 M. A. F. Allaart 1 A. Apituley 8 S Beirle 9 J. B. Bergwerff 8 A. J. C. Berkhout 8 D. Brunner 10 A. Cede 11 J. Chong 12 K. Clémer 4 C. Fayt 4 U. Frieß 13 L. F. L. Gast 8 M. Gil-Ojeda 14 Florence Goutail 15 R. Graves 16 Alexandra Griesfeller 15 K. Großmann 13 G. Hemerijckx 4 F. Hendrick 4 J. Herman 11 C. Hermans 4 M. Hoexum 8 G. R. van der Hoff 8 H. Irie 17 P. V. Johnston 18 Y. Kanaya 17 Y. J. Kim 12 H. Klein Baltink 1 K. Kreher 18 G. de Leeuw 19 R. Leigh 16 A. Merlaud 4 M. M. Moerman 20 P. S. Monks 16 G. H. Mount 21 M. Navarro-Comas 14 H. Oetjen 22 Andrea Pazmino 15 M. Perez-Camacho 14 E. Peters 5 A. Du Piesanie 1 G. Pinardi 4 O. Puentadura 8 A. Richter 5 H. K. Roscoe 23 A. Schönhardt 5 B. Schwarzenbach 10 R. Shaiganfar 9 W. Sluis 1 E. Spinei 21 A. P. Stolk 8 K. Strong 7 D. P. J. Swart 8 H. Takashima 17 T. Vlemmix 1 M. Vrekoussis 24 T. Wagner 9 C. Whyte 7 K. M. Wilson 8 M. Yela 14 S. Yilmaz 13 P. Zieger 25 Y. Zhou 10
Abstract : From June to July 2009 more than thirty different in-situ and remote sensing instruments from all over the world participated in the Cabauw Intercomparison campaign for Nitrogen Dioxide measuring Instruments (CINDI). The campaign took place at KNMI's Cabauw Experimental Site for Atmospheric Research in the Netherlands. Its main objectives were to determine the accuracy of state-of-the-art ground-based measurement techniques for the detection of atmospheric nitrogen dioxide (both in-situ and remote sensing), and to investigate their usability in satellite data validation. The expected outcomes are recommendations regarding the operation and calibration of such instruments, retrieval settings, and observation strategies for the use in ground-based networks for air quality monitoring and satellite data validation. Twenty-four optical spectrometers participated in the campaign, of which twenty-one had the capability to scan different elevation angles consecutively, the so-called Multi-axis DOAS systems, thereby collecting vertical profile information, in particular for nitrogen dioxide and aerosol. Various in-situ samplers simultaneously characterized the variability of atmospheric trace gases and the physical properties of aerosol particles. A large data set of continuous measurements of these atmospheric constituents has been collected under various meteorological conditions and air pollution levels. Together with the permanent measurement capability at the Cabauw site characterizing the meteorological state of the atmosphere, the CINDI campaign provided a comprehensive observational data set of atmospheric constituents in a highly polluted region of the world during summertime. First detailed comparisons performed with the CINDI data show that slant column measurements of NO2, O4 and HCHO with MAX-DOAS agree within 5 to 15%, vertical profiles of NO2 derived from several independent instruments agree within 25%, and MAX-DOAS aerosol optical thickness agrees within 20-30% with AERONET data. For the in-situ NO2 instrument using a molybdenum converter, a bias was found as large as 5 ppbv during day time, when compared to the other in-situ instruments using photolytic converters.
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A. J. M. Piters, K. F. Boersma, M. Kroon, J. C. Hains, M. van Roozendael, et al.. The Cabauw Intercomparison campaign for Nitrogen Dioxide measuring Instruments (CINDI): design, execution, and early results. Atmospheric Measurement Techniques, European Geosciences Union, 2012, 5 (20), pp.457-485. ⟨10.5194/amt-5-457-2012⟩. ⟨hal-00625180⟩

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