Ice core data - Ice Ages and Interglacials: Measurements, Interpretation, and Models - page 163

Figure 4.24. Variation of peak solar intensity over the past 40,000 years. The solid curve is for
northern midsummer, the dotted curve is for southern midsummer, and the dashed curve is for
southern spring.
and fixed angle season.'' It is not clear to this writer what these phrases mean.
Figure 4.25 shows some of their results. The strange thing is that the solar forcing
presented by Timmermann et al. (2009) for ''austral springtime insolation forcing
at 63 S using a fixed calendar season'' looks exactly like the curve for peak solar
intensity at 65 N as calculated by this writer.
Figure 4.25. Sea salt sodium flux measured from the EPICA Dronning Maud Land ice core
and solar forcing as reported by Timmermann et al. (2009). This forcing was based on ''austral
springtime insolation forcing at 63 S using a fixed calendar season.'' The solid line is peak solar
intensity at 65 N as calculated by this writer (the vertical scale is arbitrary).