Statistics – Computation
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.111..369b&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 111, no. 2-4, July 1992, p. 369-382. Research supported by CEA.
Statistics
Computation
29
Earth Rotation, Orbital Elements, Paleoclimatology, Secular Variations, Solar Orbits, Earth Orientation, Earth-Moon System
Scientific paper
Three solutions (a numerical (QTD90), a semi-analytical (LA90), and an analytical (BER90)) for the planetary and precessional elements of the earth have recently become available. They allow the computation of the fundamental astroclimatic parameters (eccentricity, climatic precession, and obliquity). The agreement between these different solutions is remarkably good, reflecting their accuracy, in such a way that they can be considered reliable enough for paleoclimate studies over at least 3 Myr. The difference between these solutions in eccentricity is less than 0.005 over this time interval, while the differences in obliquity and climate precession are larger but mainly due to phase lag between the solutions. At 3 Myr BP, BER90 leads LA90 by 6000 yrs and QTD90 by 9000 yrs for the obliquity, and it leads LA90 by 2000 yrs and QTD90 by 4000 yrs for the climate precession.
Berger Adam
Loutre Marie-France
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