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| Titel |
Interannual climate variability seen in the Pliocene Model Intercomparison Project |
| VerfasserIn |
C. M. Brierley |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 3 ; Nr. 11, no. 3 (2015-03-27), S.605-618 |
| Datensatznummer |
250117219
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| Publikation (Nr.) |
 copernicus.org/cp-11-605-2015.pdf |
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| Zusammenfassung |
| Following reconstructions suggesting weakened temperature gradients along the
Equator in the early Pliocene, there has been much speculation about Pliocene
climate variability. A major advance for our knowledge about the later
Pliocene has been the coordination of modelling efforts through the Pliocene
Model Intercomparison Project (PlioMIP). Here the changes in interannual
modes of sea surface temperature variability will be presented across
PlioMIP. Previously, model ensembles have shown little consensus in the
response of the El Niño–Southern Oscillation (ENSO) to imposed forcings
– either for the past or future. The PlioMIP ensemble, however, shows
surprising agreement, with eight models simulating reduced variability and
only one model indicating no change. The Pliocene's robustly weaker ENSO also
saw a shift to lower frequencies. Model ensembles focussed on a wide variety
of forcing scenarios have not yet shown this level of coherency. Nonetheless,
the PlioMIP ensemble does not show a robust response of either ENSO flavour
or sea surface temperature variability in the tropical Indian and North
Pacific oceans. Existing suggestions linking ENSO properties to to changes in
zonal temperature gradient, seasonal cycle and the elevation of the Andes
Mountains are investigated, yet prove insufficient to explain the consistent
response. The reason for this surprisingly coherent signal warrants further
investigation. |
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