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| Titel |
Examining the stratospheric response to the solar cycle in a coupled WACCM simulation with an internally generated QBO |
| VerfasserIn |
A. C. Kren, D. R. Marsh, A. K. Smith, P. Pilewskie |
| 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 ; 14, no. 10 ; Nr. 14, no. 10 (2014-05-16), S.4843-4856 |
| Datensatznummer |
250118719
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| Publikation (Nr.) |
 copernicus.org/acp-14-4843-2014.pdf |
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| Zusammenfassung |
| The response of the stratosphere to the combined interaction of the
quasi-biennial oscillation (QBO) and the solar cycle in ultraviolet (UV)
radiation, and the influence of the solar cycle on the QBO, are investigated
using the Whole Atmosphere Community Climate Model (WACCM). Transient simulations
were performed beginning in 1850 that included fully interactive ocean and
chemistry model components, observed greenhouse gas concentrations, volcanic
eruptions, and an internally generated QBO. Over the full length of the
simulations we do not find a solar cycle modulation of either the QBO period
or amplitude. We also do not find a persistent wintertime UV response in
polar stratospheric geopotential heights when stratifying by the QBO phase. Over
individual ~40 year periods of the simulation, a statistically
significant correlation is sometimes found between the northern polar
geopotential heights in February and UV irradiance during the QBO's westerly
phase. However, the sign of the correlation varies over the simulation, and
is never significant during the QBO's easterly phase. Complementing this is
the analysis of four simulations using a QBO prescribed to match observations over
the period 1953–2005. Again, no consistent correlation is evident. In
contrast, over the same period, meteorological reanalysis shows a strong
positive correlation during the QBO westerly phase, although it weakens as
the period is extended. The results raise the possibility that the observed
polar solar–QBO correlation may have occurred because of the relatively short
data record and the presence of additional external forcings rather than a
direct solar–QBO interaction. |
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