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Chemical depletion of Arctic ozone in winter 1999/2000

Rex, M. and Wennberg, P. (2002) Chemical depletion of Arctic ozone in winter 1999/2000. Journal of Geophysical Research D, 107 (D20). Art. No. 8276. ISSN 0148-0227. doi:10.1029/2001JD000533.

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During Arctic winters with a cold, stable stratospheric circulation, reactions on the surface of polar stratospheric clouds (PSCs) lead to elevated abundances of chlorine monoxide (ClO) that, in the presence of sunlight, destroy ozone. Here we show that PSCs were more widespread during the 1999/2000 Arctic winter than for any other Arctic winter in the past two decades. We have used three fundamentally different approaches to derive the degree of chemical ozone loss from ozonesonde, balloon, aircraft, and satellite instruments. We show that the ozone losses derived from these different instruments and approaches agree very well, resulting in a high level of confidence in the results. Chemical processes led to a 70% reduction of ozone for a region ∼1 km thick of the lower stratosphere, the largest degree of local loss ever reported for the Arctic. The Match analysis of ozonesonde data shows that the accumulated chemical loss of ozone inside the Arctic vortex totaled 117 ± 14 Dobson units (DU) by the end of winter. This loss, combined with dynamical redistribution of air parcels, resulted in a 88 ± 13 DU reduction in total column ozone compared to the amount that would have been present in the absence of any chemical loss. The chemical loss of ozone throughout the winter was nearly balanced by dynamical resupply of ozone to the vortex, resulting in a relatively constant value of total ozone of 340 ± 50 DU between early January and late March. This observation of nearly constant total ozone in the Arctic vortex is in contrast to the increase of total column ozone between January and March that is observed during most years.

Item Type:Article
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URLURL TypeDescription Information
Wennberg, P.0000-0002-6126-3854
Additional Information:© 2002 American Geophysical Union. Received 12 February 2001; revised 2 July 2001; accepted 7 July 2001; published 20 September 2002. We thank the THESEO 2000 core group, the SOLVE project scientists, and all personnel associated with the project management for making this campaign possible. We thank the innumerable people that made this study possible due to their dedication: the ground staff at the ozonesonde stations and at ESRANGE, the ER-2 and DC-8 personnel, and the ER-2 and DC-8 pilots. We thank the European Centre for Medium-Range Weather Forecasts for supplying the meteorological data. The ozonesondes used in THESEO 2000 were supported through the EC Environment Programme under contracts EVK2-CT-1999-00047 and through numerous national projects. The SOLVE effort was supported by the Upper Atmospheric Research Program, the Atmospheric Chemistry, Modeling and Analysis Program, and the Atmospheric Effects of Aviation Program of the U.S. National Aeronautics and Space Administration. The POAM III experiment is supported by the U.S. Office of Naval Research and NASA. Research at the Jet Propulsion Laboratory, California Institute of Technology, is performed under contract with the U.S. National Aeronautics and Space Administration. Work at the Alfred Wegener Institute was supported by the BMBF under the project 07ATC08.
Funding AgencyGrant Number
EC Environment ProgrammeEVK2-CT-1999-00047
Bundesministerium für Bildung und Forschung (BMBF)07ATC08
Office of Naval Research (ONR)UNSPECIFIED
Subject Keywords:ozone; stratosphere; Match
Issue or Number:D20
Record Number:CaltechAUTHORS:20140701-070330116
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Official Citation:Rex, M., et al., Chemical depletion of Arctic ozone in winter 1999/2000, J. Geophys. Res., 107(D20), 8276, doi:10.1029/2001JD000533, 2002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46585
Deposited By: Ruth Sustaita
Deposited On:01 Jul 2014 14:53
Last Modified:10 Nov 2021 17:27

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