Roberts, Natalie L; Piotrowski, Alexander M; McManus, Jerry F; Keigwin, Lloyd D (2010): Nd isotopes of sediments, foraminifera and fish debris of the western North Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.771834, Supplement to: Roberts, NL et al. (2010): Synchronous deglacial overturning and water mass source changes. Science, 327(5961), 75-78, https://doi.org/10.1126/science.1178068
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Abstract:
Understanding changes in ocean circulation during the last deglaciation is crucial to unraveling the dynamics of glacial-interglacial and millennial climate shifts. We used neodymium isotope measurements on postdepositional iron-manganese oxide coatings precipitated on planktonic foraminifera to reconstruct changes in the bottom water source of the deep western North Atlantic at the Bermuda Rise. Comparison of our deep water source record with overturning strength proxies shows that both the deep water mass source and the overturning rate shifted rapidly and synchronously during the last deglacial transition. In contrast, any freshwater perturbation caused by Heinrich event 1 could have only affected shallow overturning. These findings show how changes in upper-ocean overturning associated with millennial-scale events differ from those associated with whole-ocean deglacial climate events.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 33.379539 * Median Longitude: -58.918318 * South-bound Latitude: 29.975389 * West-bound Longitude: -73.599861 * North-bound Latitude: 33.700000 * East-bound Longitude: -57.576000
Date/Time Start: 1984-08-31T00:00:00 * Date/Time End: 1997-03-25T00:00:00
Event(s):
172-1061 * Latitude: 29.975389 * Longitude: -73.599861 * Date/Time: 1997-03-08T00:00:00 * Elevation: -4040.2 m * Penetration: 725.5 m * Recovery: 697.1 m * Location: Blake-Bahama Outer Ridge, North Atlantic Ocean * Campaign: Leg172 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 80 cores; 725.5 m cored; 0 m drilled; 96.1% recovery
172-1063 * Latitude: 33.686444 * Longitude: -57.615000 * Date/Time: 1997-03-25T00:00:00 * Elevation: -4583.7 m * Penetration: 1155.8 m * Recovery: 1123.3 m * Location: Blake-Bahama Outer Ridge, North Atlantic Ocean * Campaign: Leg172 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 126 cores; 1155.8 m cored; 0 m drilled; 97.2% recovery
EN120-1GGC * Latitude: 33.670000 * Longitude: -57.620000 * Date/Time: 1984-08-31T00:00:00 * Elevation: -4450.0 m * Location: South Atlantic Ocean * Campaign: EN120 * Basis: Endeavor * Method/Device: Gravity corer (GC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets
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Datasets listed in this publication series
- Roberts, NL; Piotrowski, AM; McManus, JF et al. (2010): (Table S6) Nd isotopes of ODP Site 172-1061 and 172-1063 core top samples. https://doi.org/10.1594/PANGAEA.771833
- Roberts, NL; Piotrowski, AM; McManus, JF et al. (2010): (Table S1) Age models of sediment cores OCE326-GGC5, OCE326-GGC6 and EN120-GGC1. https://doi.org/10.1594/PANGAEA.771821
- Roberts, NL; Piotrowski, AM; McManus, JF et al. (2010): (Table S5) Nd isotopes of sediment core OCE326-GGC6 reductively cleaned fish debris. https://doi.org/10.1594/PANGAEA.771830
- Roberts, NL; Piotrowski, AM; McManus, JF et al. (2010): (Table S4) Nd isotopes of sediment core OCE326-GGC6 reductively clean foraminifera. https://doi.org/10.1594/PANGAEA.771829
- Roberts, NL; Piotrowski, AM; McManus, JF et al. (2010): (Table S3) Nd isotopes of sediment core OCE326-GGC6 unclean foraminifera. https://doi.org/10.1594/PANGAEA.771824
- Roberts, NL; Piotrowski, AM; McManus, JF et al. (2010): (Table S2) Nd isotopes of sediment core OCE326-GGC6 bulk sediment leachates. https://doi.org/10.1594/PANGAEA.771823