Severe 2011 ozone depletion assessed with 11 years of ozone, NO2, and OClO measurements at 80°N

C. Adams 1 K. Strong 1 X. Zhao 1 M. R. Bassford 1, 2 M. Chipperfield 3 W. H. Daffer 4 J. R. Drummond 1, 5 E. Farahani 1 W. Feng 3 A. Fraser 1, 6 Florence Goutail 7 G. L. Manney 4, 8 C. A. Mclinden 9 Andrea Pazmino 7 M. Rex 10 K. A. Walker 1, 11
1 Department of Physics [Toronto]
2 RAND Europe [Cambridge]
3 SEE - School of Earth and Environment [Leeds]
4 JPL - Jet Propulsion Laboratory
5 Department of Physics and Atmospheric Science [Halifax]
6 School of Geosciences [Edinburgh]
7 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
8 NMT - New Mexico Institute of Mining and Technology [New Mexico Tech]
9 Air Quality Research Division [Toronto]
10 AWI - Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
11 Department of Chemistry [Waterloo]
Abstract : Unusually cold conditions in Arctic winter 2010/11 led to large stratospheric ozone loss. We investigate this with UV-visible measurements made at Eureka, Canada (80.05°N, 86.42°W) from 1999-2011. For 8-22 March 2011, OClO was enhanced, indicating chlorine activation above Eureka. Ozone columns were lower than in any other year in the record, reaching minima of 237 DU and 247 DU in two datasets. The average NO2 column inside the vortex, measured at visible and UV wavelengths, was 46±30% and 45±27% lower in 2011 than the average NO2 column from previous years. Ozone column loss was estimated from two ozone datasets, using a modeled passive ozone tracer. For 12-20 March 2011, the average ozone loss was 27% and 29% (99 DU and 108 DU). The largest percent ozone loss in the 11-year record of 47% (250 DU and 251 DU) was observed on 5 April 2011.
keyword : UV-visible spectroscopy Arctic ozone depletion CANDAC DOAS PEARL Polar vortex
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Contributor : Catherine Cardon <>
Submitted on : Saturday, February 18, 2012 - 9:53:16 AM
Last modification on : Friday, January 10, 2020 - 3:42:30 PM

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C. Adams, K. Strong, X. Zhao, M. R. Bassford, M. Chipperfield, et al.. Severe 2011 ozone depletion assessed with 11 years of ozone, NO2, and OClO measurements at 80°N. Geophysical Research Letters, American Geophysical Union, 2012, 39, pp.L05806. ⟨10.1029/2011GL050478⟩. ⟨hal-00671665⟩

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