(Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores

DOI

We use planktonic oxygen isotope (d18O) records spanning the last 30,000 years (kyr) to constrain the magnitude and spatial pattern of glacial cooling in the upwelling environment of the eastern equatorial Pacific (EEP). Fourteen new downcore d18O records were obtained from surface-dwelling planktonic foraminifera Globigerinoides sacculifer and Globigerinoides ruber in eight cores from the upwelling tongue of the EEP. All sites have sedimentation rates exceeding 5 cm/kyr and, with one exception, lie above the modern depth of the foraminiferal lysocline. Sites directly underlying the cool band of upwelling immediately south of the equator record mean late Holocene (LH)-Last Glacial Maximum (LGM) d18O amplitudes ranging between 1.0 and 1.3 per mil. We estimate that mean sea surface temperatures (SST) in this region during the LGM were on average 1.5 ± 0.5°C lower than the LH. Larger d18O amplitudes are observed in sites north of the equator, indicating a spatial pattern of reduced meridional SST gradient across the equator during the LGM. This result is supported by comparison of Mg/Ca SST reconstructions from two sites straddling the equator. We interpret the reduction of this gradient during the LGM as evidence for a less intense cold tongue-Intertropical Convergence Zone (ITCZ) frontal system, a more southerly position of the ITCZ, and weaker southeast equatorial trades in the EEP.

Data of RC11-238 previously published in Faul et al. (2000). All measurements were made on monospecific foraminiferal samples comprised of N. dutertrei shells, except the 400 cm sample from core V21-30 where a mix of N. dutertrei and O. universa was used.

Supplement to: Koutavas, Athanasios; Lynch-Stieglitz, Jean (2003): Glacial-interglacial dynamics of the eastern equatorial Pacific cold tongue-Intertropical Convergence Zone system reconstructed from oxygen isotope records. Paleoceanography, 18(4), 1089

Identifier
DOI https://doi.org/10.1594/PANGAEA.841354
Related Identifier https://doi.org/10.1029/2003PA000894
Related Identifier https://doi.org/10.2113/0300110
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.841354
Provenance
Creator Koutavas, Athanasios ORCID logo; Lynch-Stieglitz, Jean ORCID logo
Publisher PANGAEA
Publication Year 2003
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 215 data points
Discipline Earth System Research
Spatial Coverage (-106.800W, -5.517S, -82.070E, 0.950N)
Temporal Coverage Begin 1963-04-05T00:00:00Z
Temporal Coverage End 1970-06-11T00:00:00Z