抄録
Surface water temperature during the Holocene, estimated from diatoms in two pistoncores-KH-79-3, L-3 from the southern part of the Japan Sea and KH-84-3, St. 33 from the western part of the Tsugaru Strait-shows good correlation with pollen flora, oxygen isotope, and sea level change curves on a time scale of 103 years. Rhythmic fluctuations of diatom temperature (Td=Xw/(Xw+Xc)) values recognized in both pistoncores indicate the extent of influx of the Tsushima warm current into the Japan Sea. Four peaks of Td values, indicating the strong influx of the Tsushima warm current (warm period), occur within a interval from the Akahoya ash (14C date, 6, 300Y.B.P.) at 86-94cm level to 0cm level in piston-core L-3.
