Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10425197l&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue B11, p. 25197-25206
Astronomy and Astrophysics
Astrophysics
3
Geodesy And Gravity: Rotational Variations, Mathematical Geophysics: Nonlinear Dynamics, Meteorology And Atmospheric Dynamics: Paleoclimatology, Solar Physics, Astrophysics, And Astronomy: Celestial Mechanics
Scientific paper
A forcing function is derived from the insolation signal with a bipolar pulse modulation train that is a function of Earth's obliquity. From this obliquity-forced insolation, there is a calculated variation of about +/-9% in the energy flux at the top of the atmosphere. Pulsations in the incoming solar radiation, induced by the amplitude-frequency coupling effect of the obliquity, correlate well with continental biogenic silica data and the marine oxygen isotope record. The theory lends a new perspective to the physical mechanism involving climate change studies. Particularly, it provides a physical explanation of the 100-kyr cycle in glaciation, which is distinct from the commonly considered variations in orbital ecentricity.
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