References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-1763-2008

Intercomparison of UV-visible measurements of ozone and NO2 during the Canadian Arctic ACE validation campaigns: 2004–2006

Fraser

¹ Goutail

² Strong

¹ Bernath

P. F.

³ ⁴ Boone

⁴ Daffer

W. H.

⁵ Drummond

J. R.

¹ ⁶ Dufour

D. G.

⁷ Kerzenmacher

T. E.

¹ Manney

G. L.

⁸ ⁹ McElroy

C. T.

¹ ¹⁰ Midwinter

¹ McLinden

C. A.

¹⁰ Nichitiu

¹ Nowlan

C. R.

¹ Walker

K. A.

¹ ⁴ Wu

¹ Zou

Department of Physics, University of Toronto, Toronto, Canada

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

Department of Chemistry, University of York, Heslington, UK

Department of Chemistry, University of Waterloo, Waterloo, Canada

Columbus Technologies and Services Inc., Pasadena, USA

Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada

Picomole Instruments Inc., Edmonton, Canada

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA

New Mexico Institute of Mining and Technology, Socorro, USA

Environment Canada, Downsview, Ontario, Canada

26 03 2008

8 6 1763 1788

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The first three Canadian Arctic ACE validation campaigns were held during polar sunrise at Eureka, Nunavut, Canada (80° N, 86° W) from 2004 to 2006 in support of validation of the ACE (Atmospheric Chemistry Experiment) satellite mission. Three or four zenith-sky viewing UV-visible spectrometers have taken part in each of the three campaigns. The differential slant column densities and vertical column densities of ozone and NO2 from these instruments have been compared following the methods of the UV-visible Working Group of the NDACC (Network for Detection of Atmospheric Composition Change). The instruments are found to partially agree within the required accuracies for both species, although both the vertical and slant column densities are more scattered than required. This might be expected given the spatial and temporal variability of the Arctic stratosphere in spring. The vertical column densities are also compared to integrated total columns from ozonesondes and integrated partial columns from the ACE-FTS (ACE-Fourier Transform Spectrometer) and ACE-MAESTRO (ACE-Measurements of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) instruments on board ACE. For both species, the columns from the ground-based instruments and the ozonesondes are found to generally agree within their combined error bars. The ACE-FTS ozone partial columns and the ground-based total columns agree within 4.5%, averaged over the three campaigns. The ACE-MAESTRO ozone partial columns are generally smaller than those of the ground-based instruments, by an average of 9.9%, and are smaller than the ACE-FTS columns by an average of 14.4%. The ACE-FTS NO2 partial columns are an average of 13.4% smaller than the total columns from the ground-based instruments, as expected. The ACE-MAESTRO NO2 partial columns are larger than the total columns of the ground-based instruments by an average of 2.5% and are larger than the partial columns of the ACE-FTS by an average of 15.5%.

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