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Onset of millennial climate variability with the intensification of Northern Hemisphere glaciation.

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Title: Onset of millennial climate variability with the intensification of Northern Hemisphere glaciation.
Authors: Hodell, David A. (AUTHOR), Abrantes, Fátima (AUTHOR), Alvarez Zarikian, Carlos A. (AUTHOR), Herbert, Timothy D. (AUTHOR), Du, Mengyao (AUTHOR), Crowhurst, Simon J. (AUTHOR), Mleneck-Vautravers, Maryline (AUTHOR), Rolfe, James E. (AUTHOR), Chen, Xi (AUTHOR), Brooks, Hannah L. (AUTHOR), Clark, William B. (AUTHOR), Dauchy-Tric, Louise F. B. (AUTHOR), dos Santos Rocha, Viviane (AUTHOR), Flores, José-Abel (AUTHOR), Hines, Sophia K. V. (AUTHOR), Huang, Huai-Hsuan May (AUTHOR), Ikeda, Hisashi (AUTHOR), Kaboth-Bahr, Stefanie (AUTHOR), Kuroda, Junichiro (AUTHOR), Link, Jasmin M. (AUTHOR)
Source: Science. 4/2/2026, Vol. 392 Issue 6793, p57-62. 6p.
Subjects: Glaciation, Climate change, Ocean, Pliocene Epoch, Glacial drift, Quaternary Period, Ice sheets, Glacial Epoch
Geographic Terms: Northern Hemisphere, North Atlantic Ocean
Abstract: The Quaternary Period (the past 2.58 million years) was characterized by the waxing and waning of large ice sheets in the Northern Hemisphere. Using sediment sequences from the Iberian Margin, we have demonstrated that expansion of Northern Hemisphere ice sheets around 2.7 million years ago was accompanied by the emergence of millennial climate variability (MCV) during glacial periods. The onset of MCV at ~2.7 million years ago was heralded by isolated precursor events, followed by multiple millennial climate oscillations at ~2.5 million years ago. These events coincided with deposition of ice-rafted detritus in the North Atlantic, suggesting a role for marine-terminating ice sheets. Once established, MCV became an intrinsic feature of glacial climates of the Quaternary. Our findings underscore the profound impact Northern Hemisphere glaciation had on climate variability across multiple timescales. Editor's summary: The large continental ice sheets of the Northern Hemisphere gradually expanded during the late Pliocene, but at least one effect of that expansion was abrupt. Hodell et al. showed that millennial climate variability began suddenly around 2.7 million years ago, suggesting that a climatic threshold of some type was passed at that time. Iceberg discharge and the associated freshwater forcing it caused seem to have played a critical role in the onset of that climate pattern, which became an intrinsic feature of the Northern Hemisphere climate during the Quaternary. —Jesse Smith [ABSTRACT FROM AUTHOR]
Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Onset of millennial climate variability with the intensification of Northern Hemisphere glaciation.
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  Data: <searchLink fieldCode="AR" term="%22Hodell%2C+David+A%2E%22">Hodell, David A.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abrantes%2C+Fátima%22">Abrantes, Fátima</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alvarez+Zarikian%2C+Carlos+A%2E%22">Alvarez Zarikian, Carlos A.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Herbert%2C+Timothy+D%2E%22">Herbert, Timothy D.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Du%2C+Mengyao%22">Du, Mengyao</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Crowhurst%2C+Simon+J%2E%22">Crowhurst, Simon J.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mleneck-Vautravers%2C+Maryline%22">Mleneck-Vautravers, Maryline</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rolfe%2C+James+E%2E%22">Rolfe, James E.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Xi%22">Chen, Xi</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Brooks%2C+Hannah+L%2E%22">Brooks, Hannah L.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Clark%2C+William+B%2E%22">Clark, William B.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dauchy-Tric%2C+Louise+F%2E+B%2E%22">Dauchy-Tric, Louise F. B.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22dos+Santos+Rocha%2C+Viviane%22">dos Santos Rocha, Viviane</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Flores%2C+José-Abel%22">Flores, José-Abel</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hines%2C+Sophia+K%2E+V%2E%22">Hines, Sophia K. V.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Huai-Hsuan+May%22">Huang, Huai-Hsuan May</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ikeda%2C+Hisashi%22">Ikeda, Hisashi</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kaboth-Bahr%2C+Stefanie%22">Kaboth-Bahr, Stefanie</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kuroda%2C+Junichiro%22">Kuroda, Junichiro</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Link%2C+Jasmin+M%2E%22">Link, Jasmin M.</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Science%22">Science</searchLink>. 4/2/2026, Vol. 392 Issue 6793, p57-62. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Glaciation%22">Glaciation</searchLink><br /><searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean%22">Ocean</searchLink><br /><searchLink fieldCode="DE" term="%22Pliocene+Epoch%22">Pliocene Epoch</searchLink><br /><searchLink fieldCode="DE" term="%22Glacial+drift%22">Glacial drift</searchLink><br /><searchLink fieldCode="DE" term="%22Quaternary+Period%22">Quaternary Period</searchLink><br /><searchLink fieldCode="DE" term="%22Ice+sheets%22">Ice sheets</searchLink><br /><searchLink fieldCode="DE" term="%22Glacial+Epoch%22">Glacial Epoch</searchLink>
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  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Northern+Hemisphere%22">Northern Hemisphere</searchLink><br /><searchLink fieldCode="DE" term="%22North+Atlantic+Ocean%22">North Atlantic Ocean</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Quaternary Period (the past 2.58 million years) was characterized by the waxing and waning of large ice sheets in the Northern Hemisphere. Using sediment sequences from the Iberian Margin, we have demonstrated that expansion of Northern Hemisphere ice sheets around 2.7 million years ago was accompanied by the emergence of millennial climate variability (MCV) during glacial periods. The onset of MCV at ~2.7 million years ago was heralded by isolated precursor events, followed by multiple millennial climate oscillations at ~2.5 million years ago. These events coincided with deposition of ice-rafted detritus in the North Atlantic, suggesting a role for marine-terminating ice sheets. Once established, MCV became an intrinsic feature of glacial climates of the Quaternary. Our findings underscore the profound impact Northern Hemisphere glaciation had on climate variability across multiple timescales. Editor's summary: The large continental ice sheets of the Northern Hemisphere gradually expanded during the late Pliocene, but at least one effect of that expansion was abrupt. Hodell et al. showed that millennial climate variability began suddenly around 2.7 million years ago, suggesting that a climatic threshold of some type was passed at that time. Iceberg discharge and the associated freshwater forcing it caused seem to have played a critical role in the onset of that climate pattern, which became an intrinsic feature of the Northern Hemisphere climate during the Quaternary. —Jesse Smith [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.ady7970
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        Text: English
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    Subjects:
      – SubjectFull: Glaciation
        Type: general
      – SubjectFull: Climate change
        Type: general
      – SubjectFull: Ocean
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      – SubjectFull: Glacial drift
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      – SubjectFull: Quaternary Period
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      – SubjectFull: Glacial Epoch
        Type: general
      – SubjectFull: Northern Hemisphere
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      – SubjectFull: North Atlantic Ocean
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