Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.269...44b&link_type=abstract
Nature, vol. 269, Sept. 1, 1977, p. 44, 45.
Astronomy and Astrophysics
Astronomy
38
Climate Change, Climatology, Core Sampling, Earth Movements, Ocean Bottom, Solar Orbits, Eccentricity, Orbital Elements, Precession, Series Expansion
Scientific paper
Hays et al. (1976) provided detailed quasi-periods from deep-sea cores that support the astronomical theory of climatic change. This letter shows that these quasi-periods are very close to the periods predicted by Berger (1977) in the latest and most accurate calculation of the variations in the different 'Milankovitch' parameters. An analysis is performed which indicates that the roughly 24,000- and 19,500-yr periods from the core samples are not significantly different from the periods associated with the largest-amplitude terms in a series expansion of earth's precession parameter; that the periods around 42,000 yr are essentially identical to the most important term in a series expansion of earth's obliquity; and that peaks in the range of 106,000 yr, which contain most of the variance, might be regarded as either a contribution from eccentricity or a beat effect of precessional periods. Evidence is discussed which suggests a positive correlation between summer temperature and eccentricity during the past 500,000 yr.
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