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The 1985 Southern Hemisphere mid-latitude total column ozone anomaly

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

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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.

Titel:The 1985 Southern Hemisphere mid-latitude total column ozone anomaly
AutorenInstitution oder E-Mail-Adresse der Autoren
Bodeker, GregNIWA, Lauder, NZ
Garny, HellaLMU München, München
Smale, DanNIWA, Lauder, NZ
Datum:14 November 2007
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In ISI Web of Science:Ja
Seitenbereich:Seiten 5625-5637
Stichwörter:QBO, solar cycle, transport
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Dynamik der Atmosphäre
Hinterlegt von: Prof. Dr. rer. nat. Martin Dameris
Hinterlegt am:17 Dez 2007
Letzte Änderung:20 Okt 2014 14:32

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