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  The simulation of the Antarctic ozone hole by chemistry-climate models

Struthers, H., Bodeker, G. E., Austin, J., Bekki, S., Cionni, I., Dameris, M., et al. (2009). The simulation of the Antarctic ozone hole by chemistry-climate models. Atmospheric Chemistry and Physics, 9, 6363-6376. doi:10.5194/acp-9-6363-2009.

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Struthers, H., Author
Bodeker, G. E., Author
Austin, J., Author
Bekki, S., Author
Cionni, I., Author
Dameris, M., Author
Giorgetta, M. A.1, 2, Author           
Grewe, V., Author
Lefevre, F., Author
Lott, F., Author
Manzini, E.1, 3, Author                 
Peter, T., Author
Rozanov, E., Author
Schraner, M., Author
Affiliations:
1The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913550              
2Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913569              
3Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913574              

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 Abstract: While chemistry-climate models are able to reproduce many characteristics of the global total column ozone field and its long-term evolution, they have fared less well in simulating the commonly used diagnostic of the area of the Antarctic ozone hole i.e. the area within the 220 Dobson Unit(DU) contour. Two possible reasons for this are: (1) the underlying Global Climate Model (GCM) does not correctly simulate the size of the polar vortex, and (2) the stratospheric chemistry scheme incorporated into the GCM, and/or the model dynamics, results in systematic biases in the total column ozone fields such that the 220DU contour is no longer appropriate for delineating the edge of the ozone hole. Both causes are examined here with a view to developing ozone hole area diagnostics that better suit measurement-model inter-comparisons. The interplay between the shape of the meridional mixing barrier at the edge of the vortex and the meridional gradients in total column ozone across the vortex edge is investigated in measurements and in 5 chemistry-climate models (CCMs). Analysis of the simulation of the polar vortex in the CCMs shows that the first of the two possible causes does play a role in some models. This in turn affects the ability of the models to simulate the large observed meridional gradients in total column ozone. The second of the two causes also strongly affects the ability of the CCMs to track the observed size of the ozone hole. It is shown that by applying a common algorithm to the CCMs for selecting a delineating threshold unique to each model, a more appropriate diagnostic of ozone hole area can be generated that shows better agreement with that derived from observations.

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Language(s): eng - English
 Dates: 2009
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 437249
DOI: 10.5194/acp-9-6363-2009
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Title: Atmospheric Chemistry and Physics
  Alternative Title : Atmos. Chem. Phys. Disc.
Source Genre: Journal
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Pages: - Volume / Issue: 9 Sequence Number: - Start / End Page: 6363 - 6376 Identifier: -