IGB

Connexion

(Colloque international - 1979)

Document title

Paleoclimatic, paleomagnetic and paleogeoidal changes: complexity and interaction in Evolution des atmosphères planétaires et climatologie de la terre=Evolution of planetary atmospheres and climatology of the earth.

Authors(s) and Affiliation(s)

MORNER N. A. ; Centre national d'Etudes spatiales. (CNES) ; 

Abstract

With the theory of geoid changes, sea level records can no longer be taken as a priori evidence of corresponding glacial volume changes. The Fennoscandian ice cap is found to have been 50% larger than generally assumed. The Grande Pile sequence (NE France) offers a unique paleoclimatic and paleomagnetic record of the last 130,000years. Several geomagnetic excursions are recorded implying rapid motions at the core/mantle interface. The data reveal a correlation between paleoclimate and the position of the geomagnetic pole: during ice ages the pole was in the Siberian-Arctic region. There is a close correlation between paleomagnetic and paleogeoid changes implying a mutual origin in core/mantle changes. The astronomical variables in the Earth/Sun constellation have a double effect, affecting both the insolation and the Earth's rate of rotation. They therefore simultaneously generate changes in paleoclimate, paleomagnetism and paleogeodesy. It is uncertain whether the main paleoclimatic effect comes from the insolation or geomagnetic field changes. A glaciation leads to a complex interaction of geophysical changes. Paleoclimate never has a simple and single explanation: complexity and interaction are key words.

Source

Congrès

Colloque international ()

Editor : Unknown country of publication (1979)

Millesime : 1979 [pp. 221-232]

Bibliographic references : 48réf.

Language

Anglais

Localisation

Maison des sciences de l'homme - Paris

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