(Table 1) Different age analysis from sediment cores XP98-PC-4 and XP98-PC-2

Osamu Seki, Kimitaka Kawamura, Minoru Ikehara, Takeshi Nakatsuka & Tadamichi Oba
Sea-surface temperatures (SSTs) in the Sea of Okhotsk were reconstructed based on alkenone unsaturation indices in two sediment cores. Alkenone-SSTs were found to range from 3 to 9 °C over the last 85 kyr with higher SST values in warm periods: Holocene and the oxygen isotope stage (OIS) 5a. In the last glacial periods (OIS 4 and 3), average alkenone SST was estimated to be 4 °C, which was 4 °C lower than the Holocene...