We analyzed total organic carbon concentration from the Japan Sea in high-resolution.
TOC concentration is high in MIS 1 and 5, and is low in MIS 2 and 4.
In MIS 3 TOC concentration is slightly elevated, with frequent fluctuations of short periodicity.
The details of TOC peaks are correlated with warm interstadials of the Greenland ice core as shown typically in MIS 3.