High resolution environmental variability during the last glaciation using results from lake sediment core and marine sediment core.

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The annually laminated sediment cores were collected from the bottom of a coastal brackish lake, Lake Ogawara, Japan. The 20-m cores represent a continuous archive of palaeoenviromental information covering approximately the last 16,000 years. The inflow of seawater into Lake Ogawara since the last glaciation started from at least 10,000yr BP. The lake was filled with warm seawater around about 6,000yr BP, which is called the Jomon Transgression of Japan, corresponding to the global sea-level rise. Although the lake water changed to fresh after 6,000yr BP, the lake became brackish from 100~200yr BP until the present. The warm seawater, which filled Lake Ogawara around 6,000y BP, originated with the Tsushima Warm Current, the northward migration of this current increased the formation of intermediate water in the western North Pacific, comparison with the results of the marine sediment core collected off Shimikita in the western North Pacific.