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| Titel |
Long-term changes in the upper stratospheric ozone at Syowa, Antarctica |
| VerfasserIn |
K. Miyagawa, I. Petropavlovskikh, R. D. Evans, C. Long, J. Wild, G. L. Manney, W. H. Daffer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 8 ; Nr. 14, no. 8 (2014-04-17), S.3945-3968 |
| Datensatznummer |
250118627
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| Publikation (Nr.) |
 copernicus.org/acp-14-3945-2014.pdf |
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| Zusammenfassung |
| Analyses of stratospheric ozone data determined from Dobson–Umkehr
measurements since 1977 at the Syowa (69.0° S, 39.6° E),
Antarctica, station show a significant decrease in ozone at altitudes higher
than that of the 4 hPa pressure level during the 1980s and 1990s. Ozone
values over Syowa have remained low since 2001. The time series of upper
stratospheric ozone from the homogenized NOAA SBUV (Solar Backscatter
Ultraviolet Instrument)(/2) 8.6 overpass data (±4°, 24 h) are in
qualitative agreement with those from the Syowa station data. Ozone recovery
during the austral spring over the Syowa station appears to be slower than
predicted by the equivalent effective stratospheric chlorine (EESC) curve.
The long-term changes in the station's equivalent latitude (indicative of
vortex size/position in winter and spring) are derived from MERRA (Modern Era
Retrospective-analysis for Research and Applications) reanalyses at ~ 2
and ~ 50 hPa. These data are used to attribute some of the upper and
middle stratospheric ozone changes to the changes in vortex position relative
to the station's location. In addition, high correlation of the Southern
Hemisphere annular mode (SAM) with polar upper stratospheric ozone during
years of maximum solar activity points toward a strong relationship between
the strength of the Brewer–Dobson circulation and the polar
stratospheric ozone recovery. In the lower stratosphere, ozone recovery
attributable to CFCs (chlorofluorocarbons) is still not definitive, whereas
the recovery of the upper stratosphere is slower than predicted. Further
research indicates that dynamical and other chemical changes in the
atmosphere are delaying detection of recovery over this station. |
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