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The 1985 Southern Hemisphere mid-latitude total column ozone anomaly

Bodeker, Greg and Garny, Hella and Smale, Dan and Dameris, Martin and Deckert, Rudolf (2007) The 1985 Southern Hemisphere mid-latitude total column ozone anomaly. Atmospheric Chemistry and Physics, 7, pp. 5625-5637.

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Official URL: http://www.atmos-chem-phys.net/7/5625/2007/

Abstract

One of the most significant events in the evolution of the ozone layer over southern mid-latitudes since the late 1970s was the large decrease observed in 1985. This event remains unexplained and a detailed investigation of the mechanisms responsible for the event has not previously been undertaken. In this study, the 1985 Southern Hemisphere mid-latitude total column ozone anomaly is analyzed in detail based on observed daily total column ozone fields, stratospheric dynamical fields, and calculated diagnostics of stratospheric mixing. The 1985 anomaly appears to result from a combination of (i) an anomaly in the meridional circulation resulting from the westerly phase of the equatorial quasi-biennial oscillation (QBO), (ii) weaker transport of ozone from its tropical mid-stratosphere source across the sub-tropical barrier to mid-latitudes related to the particular phasing of the QBO with respect to the annual cycle, and (iii) a solar cycle induced reduction in ozone. Similar QBO and solar cycle influences prevailed in 1997 and 2006 when again total column ozone was found to be suppressed over southern mid-latitudes. The results based on observations are compared and contrasted with analyses of ozone and dynamical fields from the ECHAM4.L39(DLR)/CHEM coupled chemistry-climate model (hereafter referred to as E39C). Equatorial winds in the E39C model are nudged towards observed winds between 10<sup>o</sup> S and 10<sup>o</sup> N and the ability of this model to produce an ozone anomaly in 1985, similar to that observed, confirms the role of the QBO in effecting the anomaly.

Document Type:Article
Title:The 1985 Southern Hemisphere mid-latitude total column ozone anomaly
Authors:
AuthorsInstitution or Email of Authors
Bodeker, GregNIWA, Lauder, NZ
Garny, HellaLMU München, München
Smale, DanNIWA, Lauder, NZ
Dameris, MartinUNSPECIFIED
Deckert, RudolfUNSPECIFIED
Date:14 November 2007
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:7
Page Range:pp. 5625-5637
Status:Published
Keywords:QBO, solar cycle, transport
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:17 Dec 2007
Last Modified:20 Oct 2014 14:32

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