Aguado, F., Nürnberg, Dirk , Poggemann, David Willem, Tiedemann, Ralf and Ronge, T. (2012) Southeast Pacific oceanographic change during the Plio/Pleistocene - implications from surface and subsurface temperature and salinity reconstructions. [Poster] In: GV & Sediment Meeting 2012. , 23.-28.09.2012, Hamburg .

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Abstract

The climatic transition from the Pliocene “warm house” to the Pleistocene “ice
house” and its relation to oceanographic change is widely debated. Up to now,
the southeastern S Pacific Ocean is insufficiently studied in this respect. We
analysed piston core SO213-08-2 located in the SE Pacific retrieved from ca.
2181 m water depth during RV SONNE cruise SO213.
According to the still preliminary stratigraphy based on benthic biodatums and
the correlation of proxy data to the well-dated core SO213-01-2 offshore Chile
(Poggemann et al., pers. com.), the core covers the Plio/Pleistocene time period
from ca. 3.8 Ma to 0.4 Ma, hence covering the time periods of the constriction of
the Indonesian Gateway and the closure of the Panamanian Seaway being
critical to the onset of Northern Hemisphere Glaciation .
The mixed layer planktonic foraminiferal species G. bulloides (superficial) and
the deep dweller G. inflata (subsuperficial) were investigated for δ18O and
Mg/Ca to reconstruct temperatures and salinities for the surface (SSTMg/Ca,
d18Osw) and subsurface water masses (subSSTMg/Ca, subd18Osw), and
changes in the upper ocean water mass structure. The proxy data allow to
estimate the Plio/Pleistocene interaction between surface-near Subtropical
Water (STW) and Subantarctic Water (SAAW) as well as the evolution of the
Humboldt Current system.

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