References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-7-1683-2007

Lightning-produced NO2 observed by two ground-based UV-visible spectrometers at Vanscoy, Saskatchewan in August 2004

Fraser

¹ Goutail

² McLinden

C. A.

³ Melo

S. M. L.

¹ ⁴ Strong

Department of Physics, University of Toronto, Toronto, Ontario, Canada

Service d'Aéronomie du Centre Nationale de la Recherche Scientifique, Verrières le Buisson, France

Environment Canada, Downsview, Ontario, Canada

Space Science, Canadian Space Agency, Saint-Hubert, Québec, Canada

28 03 2007

7 6 1683 1692

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Ground-based measurements of ozone and NO2 differential slant columns by the SAOZ (Système d'Analyse par Observations Zénithales) and UT-GBS (University of Toronto Ground-Based Spectrometer) instruments during the MANTRA 2004 field campaign are presented herein. During the afternoon of 28 August, a thunderstorm passed over the instruments, which were installed at Vanscoy, Saskatchewan (52° N, 107° W). Enhanced differential slant columns of ozone and NO2 were observed by both instruments during the storm, with maximum values of two and 25 times the expected clear sky columns, respectively. The enhanced ozone differential slant columns are primarily due to the longer path traversed by the solar radiation caused by multiple scattering inside the thick cloud layer associated with the thunderstorm. The enhanced NO2 columns are partly attributed to NOx production by lightning. Two new methods are used to separate the NO2 enhancements into contributions from the longer path length and production by lightning. Combining the observed excess NO2 with lightning flash data from the Canadian Lightning Detection Network and Environment Canada Doppler radar measurements, the production of NO2 molecules per lightning flash is determined. Using these two methods, the best estimate of the production rate is found to be (7.88±2.52)×1026 molecules NO2/flash from the UT-GBS and (6.81±2.17)×1026 molecules NO2/flash from SAOZ. These results are consistent with the range of previous estimates reported in the literature.

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