Article
Extended Data Fig. 6 | Results of sensitivity tests to oceanic forcing of the
GrIS and AIS. a, Response of the GrIS to atmospheric forcing from CCSM3 with
fixed ocean temperatures for the PGM (blue line) and LIG (orange line)
compared with the ice-sheet response to atmospheric and oceanic forcing
(black line). The present-day interglacial ice volume shown by horizontal
dashed line. b, Response of the AIS to atmospheric forcing from CCSM3 with
fixed ocean temperatures for the PGM (blue line) and for the LIG (orange line)
compared to ice-sheet response to atmospheric and oceanic forcing (black
line). Present interglacial ice volume shown by the horizontal dashed line. c, As
in a, but the vertical scale (grounded ice volume) has been increased to better
illustrate the response. The initial ice-sheet size used in this experiment (and
the comparable one for Antarctica) was the LIG ice sheet, whereas the climate
forcing used was for the penultimate deglaciation and the LIG: that is, from a
colder-than-present to LIG climate, resulting in a small response to the
atmospheric forcing, as the LIG ice-sheet size had already adjusted to the
combined atmospheric and oceanic forcing, as shown by the black line in a.