Abstract
Knowledge of the evolution of North Atlantic Deep Water (NADW) is key to understanding the past evolution of the climatic system. Here 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.
| Original language | English |
|---|---|
| Pages (from-to) | 4949-4955 |
| Number of pages | 7 |
| Journal | Geophysical Research Letters |
| Volume | 42 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Jun 28 2015 |
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All Science Journal Classification (ASJC) codes
- Geophysics
- Earth and Planetary Sciences(all)
Cite this
Abrupt intensification of North Atlantic Deep Water formation at the Nordic Seas during the late Pliocene climate transition. / Sato, Masahiko; Makio, Masato; Hayashi, Tatsuya; Ohno, Masao.
In: Geophysical Research Letters, Vol. 42, No. 12, 28.06.2015, p. 4949-4955.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Abrupt intensification of North Atlantic Deep Water formation at the Nordic Seas during the late Pliocene climate transition
AU - Sato, Masahiko
AU - Makio, Masato
AU - Hayashi, Tatsuya
AU - Ohno, Masao
PY - 2015/6/28
Y1 - 2015/6/28
N2 - Knowledge of the evolution of North Atlantic Deep Water (NADW) is key to understanding the past evolution of the climatic system. Here 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.
AB - Knowledge of the evolution of North Atlantic Deep Water (NADW) is key to understanding the past evolution of the climatic system. Here 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.
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U2 - 10.1002/2015GL063307
DO - 10.1002/2015GL063307
M3 - Article
VL - 42
SP - 4949
EP - 4955
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 12
ER -