The evolution of zonally asymmetric austral ozone in a chemi

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TitleThe evolution of zonally asymmetric austral ozone in a chemistry-climate modelAbstractAsymmetry in the Southern Hemisphere stratospheric ozone hole is important due to both direct radiative heating and its effect on dynamics. It is also a strong indicator of the underlying quality of the stratospheric dynamics of a climate model. We investigate the simulation of the zonal asymmetry in ozone in the NIWA-UKCA atmosphere-ocean chemistry-climate model using elliptical diagnostics, a methodology used for the first time in this subject area. During spring, the region most depleted in ozone is displaced from the pole toward South America based on ERA-Interim and the model output. The model correctly simulates the direction of this displacement but significantly underestimates its magnitude. The model shows that as ozone becomes increasingly depleted over the late 20th century this asymmetry in the ozone distribution moves west, before moving east as polar ozone recovers over the course of the 21st century. Comparison with model runs in which ozone-depleting substances are held fixed at pre-ozone-hole levels shows that this shift is primarily a function of the magnitude of ozone depletion, although increases in greenhouse gases also have some effect. © 2017 Author(s).Funding DetailsNIWA, National Institute of Water and Atmospheric Research; Core; Marsden Fund; UC, University of Canterbury; NZ, New Zealand Vice-Chancellors' Committee; 12-NIW-006, Royal Society of New Zealand; MBIE, Ministry for Business Innovation and Employment

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1st AuthorDennison, F. AuthorDennison, F.McDonald, A.Morgenstern, O.Year2017JournalAtmospheric Chemistry and PhysicsVolume17Number22Pages14075-14084DOI10.5194/acp-17-14075-2017URLhttps://www.scopus.com/inward/recor.....f4110a0dba23a18b0ff4bb6dePublisherCopernicus GmbHKeywordsasymmetrydecadal variationgreenhouse gasmodelingozone depletionseasonal variationSouthern Hemispherezonal wind

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CitationDennison, F., McDonald, A. and Morgenstern, O. (2017). The evolution of zonally asymmetric austral ozone in a chemistry-climate model. Atmospheric Chemistry and Physics, 17(22): 14075-14084Antarctica NZ supported?YesNZARI?No

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