Fig. 7: Time series of forcings and response of Northern Hemisphere ice sheets to modified astronomical forcings.
From: Astronomical forcing shaped the timing of early Pleistocene glacial cycles
a–f Time series across the period of interest and g–l corresponding normalized amplitude spectra, respectively. a Climatic precession, where the envelope corresponds to eccentricity77 is scaled by 1.0 (black), 0.6 (blue) and 0.2 (red). b Insolation at 65°N on June 2177. c Simulated Northern Hemisphere ice-sheet volume (unit: m, in sea level equivalent, SLE) for astronomical forcings in a, using the same colours. d Obliquity77 scaled by 1.0 (black) and 0.6 (red). e Insolation at 65°N on June 2177. f Simulated Northern Hemisphere ice-sheet volume (unit: m, in SLE) for the astronomical forcings in (d) using the same colours. These calculations are conducted with a constant atmospheric pCO2 of 230 ppm as in the standard experiment run.
