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Rapid strengthening of westerlies accompanied intensification of Northern Hemisphere glaciation

Author

Listed:
  • Joshua D. Bridges

    (University of Rochester)

  • John A. Tarduno

    (University of Rochester
    University of Rochester
    University of Rochester)

  • Rory D. Cottrell

    (University of Rochester)

  • Timothy D. Herbert

    (Brown University)

Abstract

The trigger, pace, and nature of the intensification of Northern Hemisphere Glaciation (iNHG) are uncertain, but can be probed by study of ODP Site 1208 North Pacific marine sediments. Herein, we present magnetic proxy data that indicate a 4-fold increase of dust between ~ 2.73 and ~ 2.72 Ma, with subsequent increases at the start of glacials thereafter, indicating a strengthening of the mid-latitude westerlies. Moreover, a permanent shift in dust composition after 2.72 Ma is observed, consistent with drier conditions in the source region and/or the incorporation of material which could not have been transported via the weaker Pliocene winds. The sudden increase in our dust proxy data, a coeval rapid rise in dust recorded by proxy dust data in the North Atlantic (Site U1313), and the Site 1208 shift in dust composition, suggest that the iNHG represents a permanent crossing of a climate threshold toward global cooling and ice sheet growth, ultimately driven by lower atmospheric CO2.

Suggested Citation

  • Joshua D. Bridges & John A. Tarduno & Rory D. Cottrell & Timothy D. Herbert, 2023. "Rapid strengthening of westerlies accompanied intensification of Northern Hemisphere glaciation," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39557-4
    DOI: 10.1038/s41467-023-39557-4
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