Sea surface temperatures reconstructed from sediment core U1338

This study presents a new alkenone-derived Sea Surface Temperature (SST) record and d18ONoelaerhabdaceae data of the 2-5 µm carbonate fractions from the IODP site U1338 located in the Eastern Equatorial Pacific (EEP), over the Miocene-Pliocene. Our data and those available from other sites of the sa...

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Bibliographic Details
Main Authors: Rousselle, Gabrielle, Beltran, Catherine, Sicre, Marie-Alexandrine, Raffi, Isabella, De Refélis, Marc
Format: Dataset
Language:English
Published: PANGAEA 2013
Subjects:
321-U1338
AGE
Alkenone
unsaturation index UK'37
Calculated from C37 alkenones (Prahl & Wakeham
1987)
Calculated from UK'37 (Müller et al
1998)
Calculated from UK37 (Conte et al.
2006)
COMPCORE
Composite Core
DEPTH
sediment/rock
Exp321
Gas chromatography - Mass spectrometry (GC-MS)
Integrated Ocean Drilling Program / International Ocean Discovery Program
IODP
Isotope ratio mass spectrometry
Joides Resolution
n-Alkane C37
Pacific Equatorial Age Transect II / Juan de Fuca
Sample code/label
Sea surface temperature
δ18O
carbonate
Pacific
Ice Sheet
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.804718
https://doi.org/10.1594/PANGAEA.804718
Description
Summary:This study presents a new alkenone-derived Sea Surface Temperature (SST) record and d18ONoelaerhabdaceae data of the 2-5 µm carbonate fractions from the IODP site U1338 located in the Eastern Equatorial Pacific (EEP), over the Miocene-Pliocene. Our data and those available from other sites of the same area show the establishment of a cold tongue during the early Pliocene (4.4 - 3.6 Ma). SST and d18ONoelaerhabdaceae time-series indicate periods of significant salinity variations. Comparison with the d18Obenthic curve from sediment cores of the Equatorial Pacific Ocean allow us to distinguish between global changes and local surface salinity variations in the EEP. Ice sheet growth and evaporation-precipitation are then discussed as possible drivers of such changes, as well as the role of Central American and the Indonesian seaway restriction. Our data suggest a shallowing of the thermocline in the EEP, between 6.8 and 6 Ma, and its shoaling between 4.8 and 4.0 Ma, suggesting the appearance of the cold tongue (Steph et al., 2010). The Pliocene climate transition would therefore not be primarily driven by Northern hemisphere glaciation.

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