Considering the extension of GRIP, the latest NEEM project excavated an ice core that can investigate the entire final interglacial period, and researched bottom melting and folds at the NEEM site. In Northern Greenland, it was warmest around 126,000 years before the beginning of the last interglacial period, and the temperature was about 8 °C ± 4 °C higher than it is now. Also, during the 6000 years between 128,000 and 122,000 years ago, the ice sheet thickness decreased by 400 ± 250 m, and 122,000 years ago the ice sheet surface altitude was 130 ± 300 higher than it is today.NEEM community members. (2013). Eemian interglacial reconstructed from a Greenland folded ice core. Nature, 493, 489‒494. From this, it is extremely rare for the ice sheet to melt even in the hot summer in Greenland, but the ice sheet surface has melted during the final interglacial period (The Eemian) due to the values of methane gas and rare gas collected from NEEM's ice core. The fact that the Greenland core remained in this temperature rise suggests that the Antarctic ice sheet shrank during the final interglacial period and contributed significantly to the rise in sea level.
