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| Titel |
On the relationship between total ozone and atmospheric dynamics and chemistry at mid-latitudes – Part 1: Statistical models and spatial fingerprints of atmospheric dynamics and chemistry |
| VerfasserIn |
L. Frossard, H. E. Rieder, M. Ribatet, J. Staehelin, J. A. Maeder, S. Rocco, A. C. Davison, T. Peter |
| 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 ; 13, no. 1 ; Nr. 13, no. 1 (2013-01-08), S.147-164 |
| Datensatznummer |
250011720
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| Publikation (Nr.) |
 copernicus.org/acp-13-147-2013.pdf |
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| Zusammenfassung |
| We use statistical models for mean and extreme values of total column
ozone to analyze "fingerprints" of atmospheric dynamics
and chemistry on long-term ozone changes at northern and southern
mid-latitudes on grid cell basis. At each grid cell, the
r-largest order statistics
method is used for the analysis of extreme events in low and high total ozone
(termed ELOs and EHOs, respectively), and an autoregressive moving
average (ARMA) model is used for the corresponding mean value analysis.
In order to describe the dynamical and chemical state of the
atmosphere, the statistical models include important atmospheric
covariates: the solar cycle, the Quasi-Biennial Oscillation (QBO),
ozone depleting substances (ODS) in terms of equivalent effective
stratospheric chlorine (EESC), the North Atlantic Oscillation (NAO),
the Antarctic Oscillation (AAO), the El Niño/Southern
Oscillation (ENSO), and aerosol load after the volcanic eruptions of
El Chichón and Mt. Pinatubo. The influence of the individual
covariates on mean and extreme levels in total column ozone is
derived on a grid cell basis. The results show that
"fingerprints", i.e., significant influence, of dynamical and
chemical features are captured in both the "bulk" and the tails of
the statistical distribution of ozone, respectively described by mean values and
EHOs/ELOs. While results for the solar cycle, QBO, and EESC are in
good agreement with findings of earlier studies, unprecedented
spatial fingerprints are retrieved for the dynamical covariates.
Column ozone is enhanced over Labrador/Greenland, the North Atlantic sector
and over the Norwegian Sea, but is reduced over Europe, Russia and the Eastern
United States during the positive NAO phase, and vice-versa during the negative
phase. The NAO's southern counterpart, the AAO, strongly influences column ozone
at lower southern mid-latitudes, including the southern parts of South America
and the Antarctic Peninsula, and the central southern mid-latitudes. Results for
both NAO and AAO confirm the importance of atmospheric dynamics for ozone
variability and changes from local/regional to global scales. |
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