The Antarctic ice sheet preserves climate information.
A deep ice core was continuously drilled down to a depth of 2,503 m at Dome Fuji station, Antarctica.
Oxygen isotope measurements were conducted
on 7 to 50 cm-long ice core samples selected from the entire core depth.
A time scale for the Dome Fuji core is calculated from past accumulation rates
and an ice flow model. Past accumulation rates were converted from oxygen isotope values.
A depth-age profile was obtained for the past 320 kyr.
The obtained temperature profile shows the characteristics of the past three glacial and interglacial periods.
The power spectrum of δ^<18>O change reveals three dominant cycles.
