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| Titel |
Modelling oxygen isotopes in the Pliocene: Large Scale Features over the Land and Ocean. |
| VerfasserIn |
Julia Tindall, Alan Haywood |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105025
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| Publikation (Nr.) |
 EGU/EGU2015-4469.pdf |
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| Zusammenfassung |
| Simulations of the mid Pliocene warm period (~3.205Ma), performed with the isotope
enabled version of the Hadley Centre GCM (HadCM3) are used to discuss the interpretation
of δ18O proxies in a warm climate.
The model suggests that spatial patterns of ocean surface δ18O were similar in the
Pliocene and the Preindustrial; however there were some differences, particularly over high
latitudes and coastal regions. Modelled ocean surface Pliocene δ18O is closely related to
modelled ocean surface Pliocene salinity, which supports using δ18O as a paleosalinity proxy
for this time period.
Modelled δ18O in precipitation (δ18O P) is generally enriched relative to the
preindustrial, with the enrichment greater at high latitudes, and reaching up to 25permil over
Antarctica. Pliocene minus preindustrial changes in δ18OP are associated with precipitation
changes at low latitudes and temperature changes at high latitudes; however δ18OP
changes are more strongly associated with regional climate than local climate. The
model suggests that when interpreting oxygen isotope proxies the location of the
climate signal recorded can be more uncertain than the amplitude, and that the
absence of a signal in δ18O does not necessarily imply the absence of a climate
signal.
The results of this study could lead to enhanced cohesion between models and oxygen
isotope data for warm climates. |
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