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| Titel |
Estonian total ozone climatology |
| VerfasserIn |
K. Eerme, U. Veismann, R. Koppel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 20, no. 2 ; Nr. 20, no. 2, S.247-255 |
| Datensatznummer |
250014360
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| Publikation (Nr.) |
 copernicus.org/angeo-20-247-2002.pdf |
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| Zusammenfassung |
The climatological
characteristics of total ozone over Estonia based on the Total Ozone Mapping
Spectrometer (TOMS) data are discussed. The mean annual cycle during 1979–2000
for the site at 58.3° N and 26.5° E is compiled. The available ground-level
data interpolated before TOMS, have been used for trend detection. During the
last two decades, the quasi-biennial oscillation (QBO) corrected systematic
decrease of total ozone from February–April was 3 ± 2.6% per decade. Before
1980, a spring decrease was not detectable. No decreasing trend was found in
either the late autumn ozone minimum or in the summer total ozone. The QBO
related signal in the spring total ozone has an amplitude of ± 20 DU and phase
lag of 20 months. Between 1987–1992, the lagged covariance between the
Singapore wind and the studied total ozone was weak. The spring (April–May)
and summer (June–August) total ozone have the best correlation (coefficient
0.7) in the yearly cycle. The correlation between the May and August total
ozone is higher than the one between the other summer months. Seasonal power
spectra of the total ozone variance show preferred periods with an over 95%
significance level. Since 1986, during the winter/spring, the contribution
period of 32 days prevails instead of the earlier dominating 26 days. The
spectral densities of the periods from 4 days to 2 weeks exhibit high
interannual variability.
Key words. Atmospheric composition
and structure (middle atmosphere – composition and chemistry; volcanic
effects) – Meteorology and atmospheric dynamics (climatology) |
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