Severe 2011 ozone depletion assessed with 11 years of ozone, NO 2 , and OClO measurements at 80°N

• Published in: Geophysical Research Letters
• Main Authors: Adams, C., Strong, K., Zhao, X., Bassford, M. R., Chipperfield, M., Daffer, W. H., Drummond, J. R., Farahani, E., Feng, W., Fraser, A., Goutail, Florence, Manney, G. L., Mclinden, C. A., Pazmino, Andrea, Rex, M., Walker, K. A.
• Other Authors: Department of Physics Toronto, University of Toronto, RAND Europe Cambridge, School of Earth and Environment Leeds (SEE), University of Leeds, Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, Department of Physics and Atmospheric Science Halifax, Dalhousie University Halifax, School of Geosciences Edinburgh, University of Edinburgh, STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), New Mexico Institute of Mining and Technology New Mexico Tech (NMT), Air Quality Research Division Toronto, Environment and Climate Change Canada, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Department of Chemistry Waterloo, University of Waterloo Waterloo
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2012
• Subjects: UV-visible spectroscopy; Arctic ozone depletion; CANDAC; DOAS; PEARL; Polar vortex; [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]; Arctic; Canada; Eureka
• Online Access: https://hal.archives-ouvertes.fr/hal-00671665; https://hal.archives-ouvertes.fr/hal-00671665/document; https://hal.archives-ouvertes.fr/hal-00671665/file/2011GL050478.pdf; https://doi.org/10.1029/2011GL050478

International audience 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 NO 2 column inside the vortex, measured at visible and UV wavelengths, was 46±30% and 45±27% lower in 2011 than the average NO 2 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.