deMenocal, Peter B; Oppo, Delia W; Fairbanks, Richard G; Prell, Warren L (1992): Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.701470, Supplement to: deMenocal, PB et al. (1992): Pleistocene d13C variability of North Atlantic intermediate water. Paleoceanography, 7(2), 229-250, https://doi.org/10.1029/92PA00420
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Abstract:
Variations in the stable isotopic composition of benthic foraminifera from Deep-Sea Drilling Project (DSDP) site 502B in the Caribbean Sea are used to reconstruct Atlantic intermediate water circulation variability over the last 1.2 m.y. Comparison of this record with other North Atlantic benthic isotope records indicates that Atlantic intermediate water circulation was relatively enhanced during glacial maxima when North Atlantic deep water (NADW) production was reduced. However, a simple, compensatory relationship between intermediate and deepwater circulation is not apparent. Geochemical models have shown that such changes in ocean circulation can affect atmospheric CO2 levels by changing vertical nutrient and alkalinity profiles. The Delta delta13C difference between Caribbean site 502B and deep equatorial Pacific site 677 is highly coherent and in phase with ice volume. Like the delta18O record, there is an increase in amplitude (40%) and a large increase in 100 kyr power after 0.7 Ma. The 1.2 per mil Delta delta13C amplitude scales to 70 ppm V in atmospheric CO2 using Boyle's (1986) box model result. The implied increase in CO2 amplitude after 0.7 Ma may suggest a positive feedback role in effecting the higher-amplitude climatic fluctuations which characterize the last 0.7 m.y.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 11.491450 * Median Longitude: -79.378500 * South-bound Latitude: 11.491100 * West-bound Longitude: -79.378800 * North-bound Latitude: 11.491800 * East-bound Longitude: -79.378200
Date/Time Start: 1979-08-16T00:00:00 * Date/Time End: 1979-08-16T00:00:00
Event(s):
68-502_Site * Latitude: 11.491100 * Longitude: -79.378800 * Date/Time: 1979-08-16T00:00:00 * Elevation: -3051.0 m * Penetration: 7.573 m * Recovery: 5.313 m * Location: Caribbean Sea/RIDGE * Campaign: Leg68 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 169 cores; 629.8 m cored; 24.1 m drilled; 84.4% recovery
68-502B * Latitude: 11.491800 * Longitude: -79.378200 * Date/Time: 1979-08-16T00:00:00 * Elevation: -3051.0 m * Penetration: 99.7 m * Recovery: 87.7 m * Location: Caribbean Sea/RIDGE * Campaign: Leg68 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 99.7 m cored; 0 m drilled; 88 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- deMenocal, PB; Oppo, DW; Fairbanks, RG et al. (1992): (Table A1) Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi from DSDP Site 68-502 in the Caribbean Sea. https://doi.org/10.1594/PANGAEA.52481
- deMenocal, PB; Oppo, DW; Fairbanks, RG et al. (1992): (Table B1) Age model of DSDP Hole 68-502B in the Caribbean Sea. https://doi.org/10.1594/PANGAEA.52482