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| Titel |
Stratospheric impact on tropospheric ozone variability and trends: 1990–2009 |
| VerfasserIn |
P. G. Hess, R. Zbinden |
| 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. 2 ; Nr. 13, no. 2 (2013-01-18), S.649-674 |
| Datensatznummer |
250017594
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| Publikation (Nr.) |
 copernicus.org/acp-13-649-2013.pdf |
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| Zusammenfassung |
| The influence of stratospheric ozone on the interannual variability and
trends in tropospheric ozone is evaluated between 30 and 90° N
from 1990–2009 using ozone measurements and a global chemical transport
model, the Community Atmospheric Model with chemistry (CAM-chem). Long-term
measurements from ozonesondes, at 150 and 500 hPa, and the Measurements
of OZone and water vapour by in-service Airbus aircraft programme (MOZAIC),
at 500 hPa, are analyzed over Japan, Canada, the Eastern US and Northern and
Central Europe. The measurements generally emphasize northern latitudes,
although the simulation suggests that measurements over the Canadian,
Northern and Central European regions are representative of the
large-scale interannual ozone variability from 30 to 90° N at 500 hPa. CAM-chem is run with
input meteorology from the National Center for Environmental Prediction; a
tagging methodology is used to identify the stratospheric contribution to
tropospheric ozone concentrations. A variant of the synthetic ozone tracer
(synoz) is used to represent stratospheric ozone. Both the model and
measurements indicate that on large spatial scales stratospheric interannual
ozone variability drives significant tropospheric variability at 500 hPa and
the surface. In particular, the simulation and the measurements suggest
large stratospheric influence at the surface sites of Mace Head (Ireland)
and Jungfraujoch (Switzerland) as well as many 500 hPa measurement locations.
Both the measurements and simulation suggest the stratosphere has
contributed to tropospheric ozone trends. In many locations between 30–90° N
500 hPa ozone significantly increased from 1990–2000, but has
leveled off since (from 2000–2009). The simulated global ozone budget
suggests global stratosphere-troposphere exchange increased in 1998–1999 in
association with a global ozone anomaly. Discrepancies between the simulated
and measured ozone budget include a large underestimation of measured ozone
variability and discrepancies in long-term stratospheric ozone trends. This
suggests the need for more sophisticated simulations including better
representations of stratospheric chemistry and circulation. |
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