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| Titel |
Evolution of stratospheric ozone and water vapour time series studied with satellite measurements |
| VerfasserIn |
A. Jones, J. Urban, D. P. Murtagh, P. Eriksson, S. Brohede, C. Haley, D. Degenstein, A. Bourassa, C. Savigny, T. Sonkaew, A. Rozanov, H. Bovensmann, J. Burrows |
| 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 ; 9, no. 16 ; Nr. 9, no. 16 (2009-08-20), S.6055-6075 |
| Datensatznummer |
250007587
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| Publikation (Nr.) |
 copernicus.org/acp-9-6055-2009.pdf |
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| Zusammenfassung |
| The long term evolution of stratospheric ozone and water vapour has been
investigated by extending satellite time series to April 2008. For ozone, we
examine monthly average ozone values from various satellite data sets for
nine latitude and altitude bins covering 60° S to 60° N and
20–45 km and covering the time period of 1979–2008. Data are from the
Stratospheric Aerosol and Gas Experiment (SAGE I+II), the HALogen Occultation
Experiment (HALOE), the Solar BackscatterUltraViolet-2 (SBUV/2) instrument,
the Sub-Millimetre Radiometer (SMR), the Optical Spectrograph InfraRed Imager
System (OSIRIS), and the SCanning Imaging Absorption spectroMeter for
Atmospheric CHartograpY (SCIAMACHY). Monthly ozone anomalies are calculated
by utilising a linear regression model, which also models the solar,
quasi-biennial oscillation (QBO), and seasonal cycle contributions.
Individual instrument ozone anomalies are combined producing an all
instrument average. Assuming a turning point of 1997 and that the all
instrument average is represented by good instrumental long term stability,
the largest statistically significant ozone declines (at two sigma) from
1979–1997 are seen at the mid-latitudes between 35 and 45 km, namely
−7.2%±0.9%/decade in the Northern Hemisphere and
−7.1%±0.9%/in the Southern Hemisphere. Furthermore, for the period 1997 to 2008
we find that the same locations show the largest ozone recovery (+1.4% and
+0.8%/decade respectively) compared to other global regions, although the
estimated trend model errors indicate that the trend estimates are not
significantly different from a zero trend at the 2 sigma level. An all
instrument average is also constructed from water vapour anomalies during
1991–2008, using the SAGE II, HALOE, SMR, and the Microwave Limb Sounder
(Aura/MLS) measurements. We report that the decrease in water vapour values
after 2001 slows down around 2004–2005 in the lower tropical stratosphere
(20–25 km) and has even shown signs of increasing until present. We show
that a similar correlation is also seen with the temperature measured at
100 hPa during this same period. |
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