Late Pliocene and early Pleistocene rock-magnetic record of IODP Site 306-U1314 ...
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 iso...
Main Authors: | , , , |
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Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2015
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Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.848329 https://doi.pangaea.de/10.1594/PANGAEA.848329 |
Summary: | 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 ... : 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 ... |
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