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The paleoenvironmental history was reconstructed using diatom analysis from sediment core UBGH1-09 in the Ulleung Basin. It has been analyzed to Quantitative diatom abundance. High number of diatom valves per gram of dry sediment was observed in core, ranging from 0.3-10.4 ×107 /g. Three diatom asse...

The paleoenvironmental history was reconstructed using diatom analysis from sediment core UBGH1-09 in the Ulleung Basin. It has been analyzed to Quantitative diatom abundance. High number of diatom valves per gram of dry sediment was observed in core, ranging from 0.3-10.4 ×107 /g. Three diatom assemblage zones are identified on the basis of frequency of the critical taxa throughout the section: diatom assemblage zone Ⅰ (174.00 m - 134.10 m), diatom assemblage zone Ⅱ (125.00 m - 75.00 m), and diatom assemblage zone Ⅲ (67.00 m - 0.12 m). High value of Td" ratio(warm current species: Pseudoeunotia doliolus, Hemidiscus cuneiformis and Lithodesmium undulatum) and neritic-benthic species in the diatom assemblage zone I indicates neritic environment inflow the warm Tsushima current. Low value of Td" ratio(cold current species: Rhizosolenia setigera and Denticulopsis seminae) and high abundance of neritic-benthic species in the diatom assemblage zone Ⅱ, suggesting colder neritic environment. In contrast, Ⅲ assemblage zone is indicated to the high value of Td" ratio(warm current species: Pseudoeunotia doliolus, Hemidiscus cuneiformis and Lithodesmium undulatum) and low abundance of neritic-benthic species, as denotes the open water environment in warming periods.

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