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Time variation in coarse materials from lake bottom sediments and secular paleoclimatic change
Author(s) -
Kashiwaya Kenji,
Fukuyama Kaoru,
Yamamoto Atsuyuki
Publication year - 1991
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/91gl01555
Subject(s) - interglacial , geology , secular variation , insolation , sediment , climate change , variation (astronomy) , climatology , period (music) , paleoclimatology , oceanography , physical geography , glacial period , geomorphology , geophysics , physics , astrophysics , acoustics , geography
Variations in the percentage of materials coarser than 4.5 ϕ in sediment from Lake Biwa are closely related to global climatic change and are indicative of large fluctuations in sediment discharge into the lake. Coarse materials increased markedly during the interglacials (postglacial and last interglacial periods). The variations also are linked with solar insolation and have distinct periods of about 20,000 and 40,000 years which correspond to the periods of the obliquitical and precessional parameters. Periods of 60,000 and 120,000 years are major in the variations.