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| Titel |
The skill of current climate models in reproducing atmospheric teleconnection patterns and related dynamical feedbacks |
| VerfasserIn |
K. Dethloff, D. Handorf |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250059787
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| Zusammenfassung |
| This study evaluates the ability of current climate models to
reproduce the low-frequency variability of the mid-tropospheric winter flow
of the Northern Hemisphere in terms of atmospheric
teleconnection patterns. Therefore, multi-model simulations for
present day conditions, performed for the 4th assessment report of the
Intergovernmental Panel on Climate Change have been analysed and
compared with reanalysis data sets.
The spatial patterns of atmospheric teleconnections are reproduced
reasonably by most of the models. The comparison of coupled with
atmosphere-only runs confirmed the negligible influence of the forcing
by sea surface temperature anomalies on the spatial pattern structure,
except for wave-train like patterns. Due to internal climate
variability, the models are not able to reproduce the observed
temporal behaviour.
Insights into the dynamical reasons for the limited skill of climate
models in reproducing atmospheric teleconnections has been obtained by
studying the relation between major teleconnections and zonal wind
variability patterns. About half of the models are able to
reproduce the observed relationship. For these cases, the quality of
simulated teleconnection patterns is largely determined by the quality of
zonal wind variability patterns. Therefore, improvements of
simulated eddy-mean flow interaction have the potential to improve the
low-frequency variability in terms of atmospheric teleconnections. |
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