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| Titel |
On the mechanisms of Interdecadal Pacific Oscillation-type variability |
| VerfasserIn |
R. Farneti, F. Kucharski, F. Molteni |
| 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 |
250067273
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| Zusammenfassung |
| Using a suite of idealised AGCM and OGCM simulations, a possible mechanism
for Interdecadal Pacific Oscillation (IPO)-type variability is identified.
In our forced atmosphere-only and ocean-only runs, it is shown that
persistent equatorial Sea Surface Temperature anomalies (SSTa) that
occured for example in the first decade of the 21th century, are able to
generate extratropical atmospheric circulation changes that in turn modify
the North Pacific gyre on a decadal-interdecadal time scale. Moreover, the
extratropical ocean feeds back on the equatorial region resulting in
reversed SSTa in the equatorial Pacific on a multidecadal timescale. Such
a delayed feedback seems to be at least partially responsible in giving
rise to multidecadal Pacific oscillatory variability in our model
integrations. In fact, our simulations are able to reproduce observed
statistical modes of variability such as the IPO. It is also shown that
this mode produces global teleconnections, potentially influencing the
phase of the North Atlantic Oscillation and its reversal. |
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