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Simple measures of ozone depletion in the polar stratosphere

Müller, Rolf and Grooß, Jens-Uwe and Lemmen, Carsten and Heinze, D. and Dameris, Martin and Bodeker, Greg (2008) Simple measures of ozone depletion in the polar stratosphere. Atmospheric Chemistry and Physics, 8, pp. 251-264.

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Official URL: http://www.atmos-chem-phys.net/8/251/2008/

Abstract

We investigate the extent to which quantities that are based on total column ozone are applicable as measures of ozone loss in the polar vortices. Such quantities have been used frequently in ozone assessments by the World Meteorological Organization (WMO) and also to assess the performance of chemistry-climate models. The most commonly considered quantities are March and October mean column ozone poleward of geometric latitude 63° and the spring minimum of daily total ozone minima poleward of a given latitude. Particularly in the Arctic, the former measure is affected by vortex variability and vortex break-up in spring. The minimum of daily total ozone minima poleward of a particular latitude is debatable, insofar as it relies on one single measurement or model grid point. We find that, for Arctic conditions, this minimum value often occurs in air outside the polar vortex, both in the observations and in a chemistry-climate model. Neither of the two measures shows a good correlation with chemical ozone loss in the vortex deduced from observations. We recommend that the minimum of daily minima should no longer be used when comparing polar ozone loss in observations and models. As an alternative to the March and October mean column polar ozone we suggest considering the minimum of daily average total ozone poleward of 63° equivalent latitude in spring (except for winters with an early vortex break-up). Such a definition both obviates relying on one single data point and reduces the impact of year-to-year variability in the Arctic vortex breakup on ozone loss measures. Further, this measure shows a reasonable correlation (r= − 0.75) with observed chemical ozone loss. Nonetheless, simple measures of polar ozone loss must be used with caution; if possible, it is preferable to use more sophisticated measures that include additional information to disentangle the impact of transport and chemistry on ozone.

Document Type:Article
Title:Simple measures of ozone depletion in the polar stratosphere
Authors:
AuthorsInstitution or Email of Authors
Müller, RolfFZ Jülich
Grooß, Jens-UweFZ Jülich
Lemmen, CarstenFZ Jülich
Heinze, D.FZ Jülich
Dameris, MartinUNSPECIFIED
Bodeker, GregNIWA, NZ
Date:2008
Journal or Publication Title:Atmospheric Chemistry and Physics
Volume:8
Page Range:pp. 251-264
Status:Published
Keywords:ozone depletion, quantification, climate-chemistry model
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Prof. Dr. rer. nat. Martin Dameris
Deposited On:11 Sep 2007
Last Modified:12 Dec 2013 20:26

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