Interglacials, Milankovitch Cycles, Solar Activity, and Carbon Dioxide

Figure 5

(a) Spectral power of the galactic cosmic ray flux for the past 220 ky as shown by ¹⁰Be in ocean sediments—from Figure 6 below; (b) the detrended and normalized δ ¹⁸O power spectral densities versus frequency over the last 900 kyr [(a) from Kirkby et al. [9] and (b) from Schulz and Zeebe [14]]. The resolution in (a) is not as good as in (b) because of the relatively short record.

(a)

(b)