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

Tatsuya Tsutsumi, Masao Nakada

Research output: Contribution to journalArticle

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

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obliquity
glaciation
Pliocene
insolation
negative feedback
deep-sea sediment
Saturn
ellipticity
lower mantle
Northern Hemisphere
Jupiter (planet)
Jupiter
sediment core
sediments
Earth mantle
viscosity
perturbation
orbits
climate change

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

The intensification of glaciation in the mid-Pliocene and the Earth's obliquity variation. / Tsutsumi, Tatsuya; Nakada, Masao.

In: Geophysical Research Letters, Vol. 25, No. 20, 15.10.1998, p. 3879-3882.

Research output: Contribution to journalArticle

Tsutsumi, Tatsuya ; Nakada, Masao. / The intensification of glaciation in the mid-Pliocene and the Earth's obliquity variation. In: Geophysical Research Letters. 1998 ; Vol. 25, No. 20. pp. 3879-3882.
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