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Koutavas, Athanasios; Lynch-Stieglitz, Jean (2003): (Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores. PANGAEA,, Supplement to: Koutavas, A; Lynch-Stieglitz, J (2003): Glacial-interglacial dynamics of the eastern equatorial Pacific cold tongue-Intertropical Convergence Zone system reconstructed from oxygen isotope records. Paleoceanography, 18(4), 1089,

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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.
Related to:
Faul, Kristina L; Ravelo, Ana Christina; Delaney, Margaret Lois (2000): Reconstructions of upwelling, productivity, and photic zone depth in the eastern equatorial Pacific Ocean using planktonic foraminiferal stable isotopes and abundances. Journal of Foraminiferal Research, 30(2), 110-125,
Median Latitude: -1.802125 * Median Longitude: -89.121250 * South-bound Latitude: -5.517000 * West-bound Longitude: -106.800000 * North-bound Latitude: 0.950000 * East-bound Longitude: -82.070000
Date/Time Start: 1963-04-05T00:00:00 * Date/Time End: 1970-06-11T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 4.000 m
RC08-102 * Latitude: -1.417000 * Longitude: -86.850000 * Date/Time: 1964-04-14T00:00:00 * Elevation: -2180.0 m * Recovery: 16.67 m * Campaign: RC08 * Basis: Robert Conrad * Method/Device: Piston corer (PC)
RC11-238 * Latitude: -1.517000 * Longitude: -85.820000 * Date/Time: 1967-10-14T00:00:00 * Elevation: -2573.0 m * Recovery: 9.97 m * Campaign: RC11 (RC1112) * Basis: Robert Conrad * Method/Device: Piston corer (PC)
RC13-140 * Latitude: -2.865000 * Longitude: -87.750000 * Date/Time: 1970-06-11T00:00:00 * Elevation: -2246.0 m * Recovery: 11.23 m * Campaign: RC13 * Basis: Robert Conrad * Method/Device: Piston corer (PC)
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.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Elevation of eventElevationm
2Latitude of eventLatitude
3Longitude of eventLongitude
4Event labelEvent
5DEPTH, sediment/rockDepthmGeocode
6Age, datedAge datedkaKoutavas, AthanasiosAge, 14C AMS
7Age, difference errorAge diff e±Koutavas, AthanasiosAge, 14C AMS
8Calendar ageCal ageka BPKoutavas, AthanasiosAge, 14C calibrated, CALIB 4.3 (Stuiver et al., 1998)corrected by -450 a
9Calendar age, maximum/oldCal age maxka BPKoutavas, AthanasiosAge, 14C calibrated, CALIB 4.3 (Stuiver et al., 1998)1 sigma range, corrected by -450 a
10Calendar age, minimum/youngCal age minka BPKoutavas, AthanasiosAge, 14C calibrated, CALIB 4.3 (Stuiver et al., 1998)1 sigma range, corrected by -450 a
11Laboratory code/labelLab labelKoutavas, AthanasiosNOSAMS Accession Number
215 data points

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