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| Titel |
The Quasi-biennial Oscillation and annual variations in tropical ozone from SHADOZ and HALOE |
| VerfasserIn |
J. C. Witte, M. R. Schoeberl, A. R. Douglass, A. M. Thompson |
| 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 ; 8, no. 14 ; Nr. 8, no. 14 (2008-07-24), S.3929-3936 |
| Datensatznummer |
250006295
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| Publikation (Nr.) |
 copernicus.org/acp-8-3929-2008.pdf |
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| Zusammenfassung |
| We examine the tropical ozone mixing ratio perturbation fields generated
from a monthly ozone climatology using 1998 to 2006 ozonesonde data from the
Southern Hemisphere Additional Ozonesondes (SHADOZ) network and the 13-year
satellite record from 1993 to 2005 obtained from the Halogen Occultation
Experiment (HALOE). The long time series and high vertical resolution of the
ozone and temperature profiles from the SHADOZ sondes coupled with good
tropical coverage north and south of the equator gives a detailed picture of
the ozone structure in the lowermost stratosphere down through the
tropopause where the picture obtained from HALOE measurements is blurred by
coarse vertical resolution. Ozone perturbations respond to annual variations
in the Brewer-Dobson Circulation (BDC) in the region just above the
cold-point tropopause to around 20 km. Annual cycles in ozone and
temperature are well correlated. Above 20 km, ozone and temperature
perturbations are dominated by the Quasi-biennial Oscillation (QBO). Both
satellite and sonde records show good agreement between positive and
negative ozone mixing ratio anomalies and alternating QBO westerly and easterly
wind shears from the Singapore rawinsondes with a mean periodicity
of 26 months for SHADOZ and 25 months for HALOE. There is a temporal offset
of one to three months with the QBO wind shear ahead of the ozone anomaly
field. The meridional length scales for the annual cycle and the QBO,
obtained using the temperature anomalies and wind shears in the thermal wind
equation, compare well with theoretical calculations. |
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