Quantifying the isotopic composition of oxygen and carbon through time in the core BAR 9403, located off the coast of Sumatra

This short core obtained off Sumatra (BAR9403, 5.82 S, 104.0316 E) records the palaeoceanography from the Last Glacial Maximum (LGM) to the present day. The lightest 18O value (-2.99ppt) is recorded during the Holocene (~5cm depth) while the LGM (~125cm depth) is positioned at the heaviest 18O value of -0.59ppt. Once the estimated ice volume effect has been accounted for, this still leaves a substantial difference in 18O which must be accounted for through significant changes in sea-surface temperature (SST) or salinity. The 13C record ranges from a minimum at approximately 8500 yrs BP of 0.16ppt to a maximum value of 1.31ppt during MIS 3.

在苏门答腊附近获取的短岩芯（BAR9403，南纬5.82度，东经104.0316度）记录了从末次盛冰期（Last Glacial Maximum，LGM）至今的古海洋学（palaeoceanography）信息。最轻的18O值（-2.99ppt）出现于全新世（Holocene，约5cm深度），而末次盛冰期（LGM，约125cm深度）对应的18O值最重，为-0.59ppt。在扣除估算的冰量效应后，18O仍存在显著差异，这必须通过海表温度（sea-surface temperature，SST）或盐度的重大变化来解释。13C记录的最小值为0.16ppt（约8500年前），最大值为1.31ppt（出现于海洋同位素阶段3期，MIS 3）。