Biogenic Silica Record in Lake Biwa of Central Japan over the Past 145,000 Years

Jule Xiao*, Yoshio Inouchi, Hisao Kumai, Shusaku Yoshikawa, Yoichi Kondo, Tungsheng Liu, Zhisheng An


研究成果: Article査読

23 被引用数 (Scopus)


The record of the biogenic silica flux (BSF, g cm-2 (103 yr)-1) in Lake Biwa reflects changes in diatom productivity in the lake and provides information regarding changes in paleoclimatic conditions. The BSF record of Lake Biwa demonstrates five periods over the past ca. 145,000 yr when the BSF values were significantly greater than 7.5 g cm-2 (103 yr)-1, and five intervals when they were lower. The data imply that paleoclimatic conditions were warmer and wetter from ca. 123,000 to 115,000, 103,000 to 95,000, 88,000 to 72,000, 57,000 to 32,000 yr B.P., and around ca. 6000 yr B.P. when the BSF values were greater, and relatively dry and cold from ca. 141,000 to 123,000 yr B.P. and during intervals between two of the five warm and wet episodes when the BSF values were lower. Time series of the BSF record can be correlated with the record of biogenic silica content in Lake Baikal and the marine oxygen isotope stages 1 through 6. Furthermore, the BSF values varied with much higher amplitude during the last interglaciation than during the last glaciation, probably implying that the diatom productivity in Lake Biwa was likewise more variable and had a larger range under interglacial conditions than under glacial conditions.

ジャーナルQuaternary Research
出版ステータスPublished - 1997 5月

ASJC Scopus subject areas

  • 地表過程
  • 地球惑星科学(全般)


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