Reconstructing Sea Ice Conditions in the Arctic and Sub-Arctic Prior to Human Observations - Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications - page 38

Figure 11. Sea ice variations at a few sites from the northwest North Atlantic and Arctic seas (see map in Figure 10 for
core location and Table 1 for references).
Figure 12. Map showing the pattern of sea ice anomalies of the early Holocene (at about 8000 years B.P.) compared to
the recent or late Holocene (for references see Table 1). The thick line corresponds to the median of September sea ice
extent (which is close to the limit of multiyear perennial sea ice cover) for 1979-2000 A.D. (limits from the NSIDC Web
page http://nsidc.org/sotc/sea_ice.html). The dashed line corresponds approximately to the maximum extent of sea ice
in winter.