Late Pliocene and early Pleistocene rock-magnetic record of IODP Site 306-U1314, supplement to: Sato, Masahiko; Makio, Masato; Hayashi, T; Ohno, Masao (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


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.

Related Identifier
Metadata Access
Creator Sato, Masahiko; Makio, Masato; Hayashi, T; Ohno, Masao
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2015
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 1764 data points
Discipline Earth System Research
Spatial Coverage (-27.888 LON, 56.364 LAT); North Atlantic
Temporal Coverage Begin 2005-04-07T00:00:00Z
Temporal Coverage End 2005-04-10T00:00:00Z