The astronomical theory and data compared - Ice Ages and Interglacials: Measurements, Interpretation, and Models - page 291

Figure 10.10. Chronology of Termination I: K ¼ results of Kawamura et al. (2007); R ¼ results
of Rothlisberger et al. (2008); SN ¼ relative peak solar intensity at 65 N; SS ¼ relative peak
solar intensity at 65 S.
Figure 10.11. Chronology of Termination II: K ¼ results of Kawamura et al. (2007);
R ¼ results of Rothlisberger et al. (2008); SN ¼ relative peak solar intensity at 65 N; SS ¼ re-
lative solar insolation at 65 S.
shown in these graphs. A number of investigators have proposed alternative
explanations for the source of ice age terminations. These tend to revolve about
changes in insolation in the NH or the SH, often with quite contradictory
interpretations.