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Mohtadi, Mahyar; Hebbeln, Dierk; Nunez-Ricardo, Samuel; Lange, Carina Beatriz (2006): Late Pleistocene proxy records of sediment core GeoB3388-1 from the eastern subtropical Pacific. PANGAEA,, Supplement to: Mohtadi, M et al. (2006): El Niño-like pattern in the Pacific during Marine Isotope Stages (MIS) 13 and 11? Paleoceanography, 21, PA1015,

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Paleoceanographic evidence from midlatitudes bearing on the long-term development of Pacific Ocean surface circulation through the middle and late Pleistocene is scant because of a lack of marine paleorecords exceeding the last four or five glacial cycles. Here we compare benthic and planktonic foraminiferal stable carbon isotope data from a 1-Myr marine record in the southeastern subtropical Pacific with records from the equatorial Pacific and Southern Ocean in order to reconstruct sea surface circulation in this part of the world ocean and its possible link to the El Niño/Southern Oscillation (ENSO). We especially address marine isotope stages (MIS) 13 and 11, when internal climate dynamics are suggested to produce somewhat unusual interglacial periods. Our results show that the Southern Ocean controlled the circulation in the subtropical Pacific throughout the middle and late Pleistocene and that the hitherto existing hypotheses cannot explain the peak d13C values in both MIS 13 and 11. We argue that the surface circulation pattern in the southeast Pacific during MIS 13 and 11 should have differed from any other interglacial, and we suggest that the subsequent changes in the latitudinal and meridional heat and moisture transfer contributed to the unusual paleoceanographic settings during these stages. We further hypothesize unusually strong El Niño–like conditions during MIS 13 and 11. This hypothesis, if true, challenges a direct forcing of ENSO by orbital parameters.
Latitude: -25.220000 * Longitude: -75.525000
Date/Time Start: 1995-06-12T00:00:00 * Date/Time End: 1995-06-12T00:00:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 7.08 m
GeoB3388-1 * Latitude: -25.220000 * Longitude: -75.525000 * Date/Time: 1995-06-12T00:00:00 * Elevation: -3558.0 m * Recovery: 7.1 m * Location: Iquique-Ridge * Campaign: SO102/2 (CHIPAL) * Basis: Sonne * Method/Device: Gravity corer (Kiel type) (SL)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2Neogloboquadrina pachyderma dextral, δ13CN. pachyderma d δ13C‰ PDBMohtadi, MahyarMass spectrometer Finnigan MAT 251Neogloboquadrina pachyderma dextral
3Cibicidoides wuellerstorfi, δ13CC. wuellerstorfi δ13C‰ PDBMohtadi, MahyarMass spectrometer Finnigan MAT 251
4Cibicidoides wuellerstorfi, δ18OC. wuellerstorfi δ18O‰ PDBMohtadi, MahyarMass spectrometer Finnigan MAT 251
412 data points

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