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

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

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3879t&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 20, p. 3879-3882

Physics

1

Planetology: Solid Surface Planets: Glaciation, Tectonophysics: Dynamics Of Lithosphere And Mantle-General

Scientific paper

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 1022Pas 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.

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