The intensification of glaciation in the mid-Pliocene and the Earth's obliquity variation

Tatsuya Tsutsumi, Masao Nakada

Research output: Contribution to journalArticlepeer-review

Abstract

The intensification of glaciation in the northern hemisphere during the past 3 Myr has clearly been confirmed by δ18O record for deep-sea sediment cores extending over the past 5-6 Myr. For earth models with a lower mantle viscosity of greater than 1022 Pa s inferred from several geophysical observables, perturbations in the Earth's dynamic ellipticity in response to this long term climatic change might have produced an increase of the average Earth's obliquity 0.06°through the resonant effect associated with the orbits of Jupiter and Saturn. This predicted obliquity change may consequently operate as a negative feedback on solar insolation, resulting in a reduction of the intensification of glaciation.

Original languageEnglish
Pages (from-to)3879-3882
Number of pages4
JournalGeophysical Research Letters
Volume25
Issue number20
DOIs
Publication statusPublished - Oct 15 1998

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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