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Rapid coupling between solid earth and ice volume during the Quaternary.

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Area of Science:

  • Earth Science
  • Climate Science
  • Geochemistry

Background:

  • The solid earth significantly impacts Earth's climate over geological timescales.
  • Volcanic CO2 and silicate weathering regulate long-term climate evolution (>10^6 years).
  • The solid earth's role in shorter Quaternary glacial-interglacial cycles (<10^5 years) remains debated.

Purpose of the Study:

  • To investigate the solid earth's response to Quaternary glacial-interglacial cycles.
  • To analyze seawater osmium isotope composition (187Os/188Os) as a proxy for solid earth's climate interactions.
  • To understand the mechanisms driving short-term solid earth-climate feedbacks.

Main Methods:

  • Analysis of seawater osmium isotope composition (187Os/188Os) over the past 300,000 years.
  • Marine Os isotope mass-balance simulation.
  • Modeling of radiogenic Os input from glacial till weathering and unradiogenic Os from seafloor hydrothermalism.

Main Results:

  • Seawater 187Os/188Os composition varied with glacial-interglacial cycles over the past 300,000 years.
  • Observed Os isotope fluctuations require inputs beyond global chemical weathering changes.
  • Fluctuations are reproduced by considering intense glacial till weathering during deglaciation and enhanced seafloor hydrothermalism during sea-level falls.

Conclusions:

  • Ice sheet volume changes during the Quaternary systematically induced short-term solid earth responses.
  • These responses occurred via chemical weathering of glacial till and seafloor magmatism.
  • Climatic changes on <10^5 year timescales can provoke rapid solid earth feedbacks, reversing conventional long-term causality.