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首页> 外文期刊>Paleoceanography >New Magnetostratigraphic Insights From Iceberg Alley on the Rhythms of Antarctic Climate During the Plio-Pleistocene
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New Magnetostratigraphic Insights From Iceberg Alley on the Rhythms of Antarctic Climate During the Plio-Pleistocene

机译:New Magnetostratigraphic Insights From Iceberg Alley on the Rhythms of Antarctic Climate During the Plio-Pleistocene

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摘要

International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea's Iceberg Alley recovered among the most continuous and highest resolution stratigraphic records in the Southern Ocean near Antarctica spanning the last 3.3 Myr. Sites drilled in Dove Basin (U1536/U1537) have well-resolved magnetostratigraphy and a strong imprint of orbital forcing in their lithostratigraphy. All magnetic reversals of the last 3.3 Myr are identified, providing a robust age model independent of orbital tuning. During the Pleistocene, alternation of terrigenous versus diatomaceous facies shows power in the eccentricity and obliquity frequencies comparable to the amplitude modulation of benthic δ18O records. This suggests that variations in Dove Basin lithostratigraphy during the Pleistocene reflect a similar history as globally integrated ice volume at these frequencies. However, power in the precession frequencies over the entire ~3.3 Myr record does not match the amplitude modulation of benthic δ18O records, suggesting Dove Basin contains a unique record at these frequencies. Comparing the position of magnetic reversals relative to local facies changes in Dove Basin and the same magnetic reversals relative to benthic δ18O at North Atlantic IODP Site U1308, we demonstrate Dove Basin facies change at different times than benthic δ18O during intervals between ~3 and 1 Ma. These differences are consistent with precession phase shifts and suggest climate signals with a Southern Hemisphere summer insolation phase were recorded around Antarctica. If Dove Basin lithology reflects local Antarctic ice volume changes, these signals could represent ice sheet precession-paced variations not captured in benthic δ18O during the 41-kyr world.

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  • 来源
    《Paleoceanography》 |2021年第2期|e2020PA003994-1-e2020PA003994-27|共27页
  • 作者单位

    Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA;

    Earth and Environmental Studies, Montclair State University, Montclair, NJ, USA;

    Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USACamborne School of Mines and Environmental Sustainability Institute, University of Exeter, Penryn Campus, Cornwall, UKInstitute for Geosciences, University of Bonn, Bonn, GermanyInternational Ocean Discovery Program, Texas AM University, College Station, TX, USAOceanographic Center of Cadiz, Spanish Institute of Oceanography (IEO), Cádiz, SpainPlanetary Magnetospheres Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USABritish Antarctic Survey, Cambridge, UK,South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, ChinaCollege of Marine Science, University of South Florida, St. Petersburg, FL, USA,Australian Centre for Ancient DNA, Department of Ecology & Evolutionary Biology, University of Adelaide, Adelaide, SA, Australia,Departmento Oceanografia, Servicio de Hidrografia Naval, ArgentinaState Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, ChinaGeology Program, University of Vale do Rio dos Sinos, S?o Leopoldo, RS, BrazilCollege of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USAGEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, GermanyDepartment of Earth Sciences, ETH Zürich, Zurich, SwitzerlandDepartment of Earth Sciences, Marine Palynology and Paleoceanography, Utrecht University, Utrecht, The NetherlandsEarth Environmental Sciences, Korea Basic Science Institute, Cheongju, Republic of KoreaKnowledge Engineering, Tokyo City University, Setagaya-ku, Tokyo, JapanCenter for Advanced Marine Core Research, Kochi University, Nankoku, Kochi, Japan,Department of Earth Sciences, University of California Riverside, Riverside, CA, USADepartment of Earth and Environmental Sciences, Wesleyan University, Middletown, CT, USAHelmholtz Center for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, GermanyDepartment of Geoscience, Indiana University of Pennsylvania, Indiana, PA, USAInstitute of Low Temperature Science, Hokkaido University, Sapporo, Hokkaido, JapanMarine Stable Isotope Lab, National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Vasco Da Gama, India;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 海洋学;
  • 关键词

    Magnetostratigraphic; Insights; Iceberg;

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