Abrupt intensification of North Atlantic Deep Water formation at the Nordic Seas during the late Pliocene climate transition

Masahiko Sato, Masato Makio, Tatsuya Hayashi, Masao Ohno

研究成果: ジャーナルへの寄稿記事

4 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)4949-4955
ページ数7
ジャーナルGeophysical Research Letters
42
発行部数12
DOI
出版物ステータス出版済み - 6 28 2015

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deep water formation
North Atlantic Deep Water
deep water
climate
coercivity
Pliocene
sediments
magnetic method
Scotland
Iceland
magnetic mineral
deep-sea sediment
curves
remanence
interglacial
sediment
acquisition
minerals
rocks
decomposition

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

これを引用

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.

:: Geophysical Research Letters, 巻 42, 番号 12, 28.06.2015, p. 4949-4955.

研究成果: ジャーナルへの寄稿記事

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