 |
| Titel |
Antarctic ozone loss in 1979-2010: first sign of ozone recovery |
| VerfasserIn |
J. Kuttippurath, F. Lefèvre, J.-P. Pommereau, H. K. Roscoe, F. Goutail, A. Pazmino, J. D. Shanklin |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 3 ; Nr. 13, no. 3 (2013-02-08), S.1625-1635 |
| Datensatznummer |
250017651
|
| Publikation (Nr.) |
 copernicus.org/acp-13-1625-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| A long-term ozone loss time series is necessary to understand
the evolution of ozone in Antarctica. Therefore, we construct
the time series using ground-based, satellite and
bias-corrected multi-sensor reanalysis (MSR) data sets for the period
1989–2010. The trends in ozone over 1979–2010 are also estimated
to further elucidate its evolution in the
wake of decreasing halogen levels in the stratosphere.
Our analysis with ground-based observations shows that the
average ozone loss in the Antarctic is about −33 to −50%
(−90 to −155 DU (Dobson Unit)) in 1989–1992, and then stayed at around
−48% (−160 DU). The ozone loss in the warmer winters
(e.g. 2002 and 2004) is lower (−37 to −46%), and in the
very cold winters (e.g. 2003 and 2006) it is higher (−52 to −55%).
These loss estimates are in good agreement with those estimated
from satellite observations, where the differences are less than
±3%.
The ozone trends based on the equivalent effective Antarctic
stratospheric chlorine (EEASC) and piecewise linear trend (PWLT)
functions for the vortex averaged ground-based, Total Ozone Mapping
Spectrometer/Ozone
Monitoring Instrument (TOMS/OMI), and MSR data averaged
over September–November exhibit about −4.6 DU yr−1
over 1979–1999, corroborating the role of halogens in the ozone
decrease during the period.
The ozone trends computed for the 2000–2010 period
are about +1 DU yr−1 for EEASC and +2.6 DU yr−1
for the PWLT functions. The larger positive PWLT trends for the 2000–2010
period indicate the influence of dynamics and other basis functions on the
increase of ozone. The trends in both periods are significant at
95% confidence intervals for all analyses. Therefore, our study suggests
that Antarctic ozone shows a significant positive trend toward its recovery,
and hence, leaves a clear signature of the successful implementation of the
Montreal Protocol. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|