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| Titel |
Cold tongue/Warm pool and ENSO dynamics in the Pliocene |
| VerfasserIn |
A. S. Heydt, A. Nnafie, H. A. Dijkstra |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2011-08-16), S.903-915 |
| Datensatznummer |
250004617
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| Publikation (Nr.) |
 copernicus.org/cp-7-903-2011.pdf |
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| Zusammenfassung |
| It has been suggested that a "permanent" El Niño climate state has existed
in the warm Pliocene. One of the main pieces of evidence of such conditions
is the small east-west sea surface temperature (SST) difference that is found
in proxy temperature records of the equatorial Pacific. Using a coupled
version of the Zebiak-Cane model of intermediate complexity for the tropical
Pacific, we study the sensitivity of the time-mean Pacific background state
and El Niño/Southern Oscillation (ENSO) variability to Pliocene climate
changes. The parameters varied in this sensitivity study include changes in
the trade wind strength due to a reduced equator-to-pole temperature
gradient, higher global mean temperatures and an open Panama gateway. All
these changes lead to a westward shift of the position of the cold tongue
along the equator by up to 2000 km. This result is consistent with data from
the PRISM3D Pliocene SST reconstruction. Our model further suggests that ENSO
variability is present in the Pliocene climate with only slight changes as
compared to today. A background climate that would resemble a "permanent" El
Niño with weak to no east-west temperature difference along the equator is
only found for very weak trade winds which seem unrealistic for the Pliocene
climate. |
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