Sato, Masahiko; Makio, Masato; Hayashi, T; Ohno, Masao (2015): Late Pliocene and early Pleistocene rock-magnetic record of IODP Site 306-U1314 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.848329, Supplement to: Sato, M et al. (2015): Abrupt intensification of North Atlantic Deep Water formation at the Nordic Seas during the late Pliocene climate transition. Geophysical Research Letters, 42(12), 4949-4955, https://doi.org/10.1002/2015GL063307
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Abstract:
Knowledge of the evolution of North Atlantic Deep Water (NADW) is key to understanding the past evolution of the climatic system. We developed a new rock-magnetic method to determine the constituent magnetic minerals of sediments and report on the evolution of NADW during 2.2-2.9 Ma. We measured isothermal remanence acquisition curves of North Atlantic deep-sea sediments drilled at the Gardar Drift and decomposed the first derivatives of these curves into high-coercivity and low-coercivity components. Residuals of the decomposition were sufficiently small throughout the study interval, confirming that the Gardar Drift sediments represent a mixing of the two end-members. Fractional changes of the high-coercivity component represent variation of the Iceland-Scotland Overflow Water, a branch of NADW formed at the Nordic Seas. The high-coercivity component increased significantly during an interglacial period just after ~2.68 Ma, which suggests that NADW formation in the Nordic Seas abruptly intensified at this time.
Project(s):
Coverage:
Latitude: 56.364000 * Longitude: -27.888000
Date/Time Start: 2005-04-07T00:00:00 * Date/Time End: 2005-04-10T00:00:00
Minimum DEPTH, sediment/rock: 199.31 m * Maximum DEPTH, sediment/rock: 299.19 m
Event(s):
306-U1314 * Latitude: 56.364000 * Longitude: -27.888000 * Date/Time Start: 2005-04-07T00:00:00 * Date/Time End: 2005-04-10T00:00:00 * Elevation: -2800.0 m * Recovery: 765.63 m * Location: North Atlantic * Campaign: Exp306 (North Atlantic Climate 2) * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Sato, Masahiko | Geocode – mcd | |
| 2 | AGE | Age | ka BP | Sato, Masahiko | Geocode | |
| 3 | High-coerecivity component | HCC | % | Sato, Masahiko | C1 | |
| 4 | Low-coerecivity component | LCC | % | Sato, Masahiko | C2 | |
| 5 | Residual | Residual | % | Sato, Masahiko | ||
| 6 | Isothermal Remanent Magnetization, intensity | IRM int | A*m2/kg | Sato, Masahiko | ||
| 7 | Isothermal Remanent Magnetization, mode of gradient | IRM mode | mT | Sato, Masahiko | ||
| 8 | Isothermal Remanent Magnetization, median of gradient | IRM median | mT | Sato, Masahiko | ||
| 9 | Isothermal Remanent Magnetization, mean of gradient | IRM mean | mT | Sato, Masahiko |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1764 data points