Higher-order eccentricity cycles of the middle and late Miocene climatic variations

Details Higher-order eccentricity cycles of the middle and late Miocene climatic variations Higher-order eccentricity cycles of the middle and late Miocene climatic variations

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.327..219t&link_type=abstract

Nature (ISSN 0028-0836), vol. 327, May 21, 1987, p. 219-221.

Physics

6

Climatology, Earth Orbits, Eccentric Orbits, Geochemistry, Geochronology, Periodic Variations, Isotopic Enrichment, Planetary Evolution

Scientific paper

Walsh spectrum analyses of 10 Myr oxygen and carbon isotope variations spanning the middle and late Miocene are presented which reveal statistically significant periodicities of approximately 2.0 and 1.25 Myr and 800, 400, 115, and 93 kyr, and harmonics of the higher-order terms with remarkable resolution. Higher-order periodicities, hitherto unexplained in the spectrum of deep-sea records, match quite well with predicted large eccentricity cycles in the earth's orbital variations, indicating that eccentricity forcing exerts a major influence on the earth's climate.

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