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| Titel |
Stratospheric ozone climatology and variability over a southern subtropical site: Reunion Island (21° S; 55° E) |
| VerfasserIn |
V. Sivakumar, T. Portafaix, H. Bencherif, S. Godin-Beekmann, S. Baldy |
| 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 ; 25, no. 11 ; Nr. 25, no. 11 (2007-11-29), S.2321-2334 |
| Datensatznummer |
250015943
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| Publikation (Nr.) |
 copernicus.org/angeo-25-2321-2007.pdf |
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| Zusammenfassung |
| The study presents the climatological characteristics of stratospheric ozone
observed over Reunion Island using in-situ (ozonesonde and SAOZ) and satellite
(UARS-HALOE, SAGE-II and TOMS) measurements. It uses co-localised
ozonesondes (from September 1992 to February 2005) and SAOZ measurements
(from January 1993 to December 2004), SAGE-II data from October 1984 to
February 1999 (~15 years), HALOE data from January 1991 to February
2005 (~15 years), and NIMBUS/TOMS data from January 1978 to December
2004 (27 years). The satellite measurements correspond to overpasses located
nearby Reunion Island (21° S; 55° E). The height profiles of ozone
concentration obtained from ozonesonde (0.5–29.5 km) show less bias in
comparison with the HALOE and SAGE-II measurements. Though, the satellite
(HALOE and SAGE-II) measurements underestimate the tropospheric ozone, they
are in good agreement for the heights above 15 km. The bias between the
measurements and the normalized ozone profile constructed from the
ozonesonde and SAGE-II satellite measurement shows that the SAGE-II
measurements are more accurate than the HALOE measurements in the lower
stratosphere. The monthly variation of ozone concentration derived from
ozonesonde and HALOE shows a nearly annual cycle with a maximum
concentration during winter/spring and minimum concentration during
summer/autumn months. The time evolution of total column ozone obtained from
TOMS, SAOZ and the one computed from ozonesonde and SAGE-II, exhibits
similar behaviour with analogous trends as above. The TOMS variation
displays a higher value of total column ozone of about 3–5 DU (10%) in
comparison with the SAOZ and the integrated ozone from ozonesonde and
SAGE-II. |
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