Slant column measurements of O3 and NO2 during the NDSC intercomparison of zenith-sky UV-visible spectrometers in June 1996

Roscoe, H. K.; Johnston, P. V.; Van Roozendael, M.; Richter, A.; Sarkissian, A.; Roscoe, J.; Preston, K. E.; Lambert, J-C.; Hermans, C.; DeCuyper, W.; Dzienus, S.; Winterrath, T.; Burrows, J.; Goutail, F.; Pommereau, J-P.; D'Almeida, E.; Hottier, J.; Coureul, C.; Didier, R.; Pundt, I.; Bartlett, L. M.; McElroy, C. T.; Kerr, J. E.; Elokhov, A.; Giovanelli, G.; Ravegnani, F.; Premuda, M.; Kostadinov, I.; Erle, F.; Wagner, T.; Pfeilsticker, K.; Kenntner, M.; Marquard, L. C.; Gil, M.; Puentedura, O.; Yela, M.; Arlander, D. W.; Kastad Hoiskar, B. A.; Tellefsen, C. W.; Karlsen Tornkvist, K.; Heese, B.; Jones, R. L.; Aliwell, S. R.; Freshwater, R. A.. 1999 Slant column measurements of O3 and NO2 during the NDSC intercomparison of zenith-sky UV-visible spectrometers in June 1996. Journal of Atmospheric Chemistry, 32 (2). 281-314. 10.1023/A:1006111216966

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Abstract/Summary

In June 1996, 16 UV-visible sensors from 11 institutes measured spectra of the zenith sky for more than 10 days. Spectra were analysed in real-time to determine slant column amounts of O3 and NO2. Spectra of Hg lamps and lasers were measured, and the amount of NO2 in a cell was determined by each spectrometer. Some spectra were re-analysed after obvious errors were found. Slant columns were compared in two ways: by examining regression analyses against comparison instruments over the whole range of solar zenith angles; and by taking fractional differences from a comparison instrument at solar zenith angles between 85° and 91°. Regression identified which pairs of instruments were most consistent, and so which could be used as universal comparison instruments. For O3, regression slopes for the whole campaign agreed within 5% for most instruments despite the use of different cross-sections and wavelength intervals, whereas similar agreement was only achieved for NO2 when the same cross-sections and wavelength intervals were used and only one half-day's data was analysed. Mean fractional differences in NO2 from a comparison instrument fall within ±7% (1-sigma) for most instruments, with standard deviations of the mean differences averaging 4.5%. Mean differences in O3 fall within ±2.5% (1- sigma) for most instruments, with standard deviations of the mean differences averaging 2%. Measurements of NO2 in the cell had similar agreement to measurements of NO2 in the atmosphere, but for some instruments measurements with cell and atmosphere relative to a comparison instrument disagreed by more than the error bars.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1023/A:1006111216966
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	01677764
NORA Subject Terms:	Chemistry
Date made live:	12 Nov 2013 10:26 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/503785

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