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Antarctic ozone depletion between 1960 and 1980 in observations and chemistry-climate model simulations

Langematz, U.; Schmidt, F.; Kunze, M.; Bodeker, G. E.; Braesicke, P.

Abstract:
The year 1980 has often been used as a benchmark for the return of Antarctic ozone to conditions assumed to be unaffected by emissions of ozone-depleting substances (ODSs), implying that anthropogenic ozone depletion in Antarctica started around 1980. Here, the extent of anthropogenically driven Antarctic ozone depletion prior to 1980 is examined using output from transient chemistry– climate model (CCM) simulations from 1960 to 2000 with prescribed changes of ozone-depleting substance concentrations in conjunction with observations. A regression model is used to attribute CCM modelled and observed changes in Antarctic total column ozone to halogen-driven chemistry prior to 1980. Wintertime Antarctic ozone is strongly affected by dynamical processes that vary in amplitude from year to year and from model to model. However, when the dynamical and chemical impacts on ozone are separated, all models consistently show a long-term, halogen-induced negative trend in Antarctic ozone from 1960 to 1980. The anthropogenically driven ozone loss from 1960 to 1980 ranges between 26.4 ±3.4 and 49.8 ±6.2% of the total anthropogenic ozone depletion ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.5194/acp-16-15619-2016
ISSN: 1680-7316, 1680-7324
URN: urn:nbn:de:swb:90-656644
KITopen ID: 1000065664
HGF-Programm 12.04.03; LK 01
Erschienen in Atmospheric chemistry and physics
Band 16
Heft 24
Seiten 15619-15627
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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