Glacial cycles and astronomical forcing
- Lawrence Berkeley Lab., CA (United States)
- International Institute for Applied Systems Analysis, Laxenburg (Austria)
Narrow spectral features in ocean sediment records offer strong evidence that the cycles of glaciation were driven by astronomical forces. Two million years ago, the cycles match the 41,000-year period of Earth`s obliquity. This supports the Croll/Milankovitch theory, which attributes the cycles to variations in insolation. But for the past million years, the spectrum is dominated by a single 100,000-year feature and is a poor match to the predictions of insolation models. The spectrum can be accounted for by a theory that derives the cycles of glaciation from variations in the inclination of Earth`s orbital plane.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 569268
- Journal Information:
- Science, Vol. 277, Issue 5323; Other Information: PBD: 11 Jul 1997
- Country of Publication:
- United States
- Language:
- English
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