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| Titel |
Intercomparison of slant column measurements of NO2 and O4 by MAX-DOAS and zenith-sky UV and visible spectrometers |
| VerfasserIn |
H. K. Roscoe, M. Roozendael, C. Fayt, A. 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, Y. J. Kim |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 6 ; Nr. 3, no. 6 (2010-11-23), S.1629-1646 |
| Datensatznummer |
250001365
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| Publikation (Nr.) |
 copernicus.org/amt-3-1629-2010.pdf |
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| Zusammenfassung |
| 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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