Radiocarbon dating of alkenones from marine sediments

GDGT proxy has not been extensively studied in the OT, and the representative depth of GDGT is unclear in this region (Nakanishi et al. Thus, there is no consensus on what each proxy represents, and no comparative assessment has yet been published regarding these proxies in the OT.In this review, we compare three temperature proxies for reconstructing SSTs in the OT: alkenones, Mg/Ca, and planktonic foraminiferal assemblages.

radiocarbon dating of alkenones from marine sediments-44radiocarbon dating of alkenones from marine sediments-11

February assemblage SSTs seem to be greatly affected by the statistical technique and/or database used.

These results suggest that seasonality should be considered in past SST reconstruction using alkenone and Mg/Ca in the OT.

Glacial–interglacial changes in the surface hydrography of the OT reconstructed based on the SST and salinity proxies were also reviewed here.

The surface hydrography of the OT has been influenced by changes in the Kuroshio Current and the East Asian monsoon system during the late Quaternary.

The sedimentation rates varied within 5–50 cm/ky in the middle OT.