Pliocene cooling enhanced by flow of low-salinity Bering Sea water to the Arctic Ocean

Keiji Horikawa*, Ellen E. Martin, Chandranath Basak, Jonaotaro Onodera, Osamu Seki, Tatsuhiko Sakamoto, Minoru Ikehara, Saburo Sakai, Kimitaka Kawamura

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

50 被引用数 (Scopus)

抄録

Warming of high northern latitudes in the Pliocene (5.33-2.58a €‰Myr ago) has been linked to the closure of the Central American Seaway and intensification of North Atlantic Deep Water. Subsequent cooling in the late Pliocene may be related to the effects of freshwater input from the Arctic Ocean via the Bering Strait, disrupting North Atlantic Deep Water formation and enhancing sea ice formation. However, the timing of Arctic freshening has not been defined. Here we present neodymium and lead isotope records of detrital sediment from the Bering Sea for the past 4.3 million years. Isotopic data suggest the presence of Alaskan glaciers as far back as 4.2a €‰Myr ago, while diatom and C 37:4 alkenone records show a long-Term trend towards colder and fresher water in the Bering Sea beginning with the M2 glaciation (3.3a €‰Myr ago). We argue that the introduction of low-salinity Bering Sea water to the Arctic Ocean by 3.3a €‰Myr ago preconditioned the climate system for global cooling.

本文言語英語
論文番号7587
ジャーナルNature Communications
6
DOI
出版ステータス出版済み - 2015/06/29

ASJC Scopus 主題領域

  • 化学一般
  • 生化学、遺伝学、分子生物学一般
  • 物理学および天文学一般

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