Abstract
We investigated the biogenic components (biogenic opal, calcium carbonate, and organic carbon) of the marine sediments in core TY99PC18 recovered from the southeastern part of the Ulleung Basin, East Sea (Japan Sea). Our results indicate that primary productivity by diatoms increased after the last glaciation (15,000 14C years b.p.) probably because of the onset of vertical mixing of seawater and nutrient supply from the deep water. Between 5,000 and 10,000 14C years b.p. a shift in the dominant primary producer, i.e. from diatoms to coccolithophores, coincides with decreased productivity, which could be related to the influx of warm, low-nutrient waters at that time. During the late Holocene (after 5,000 14C years b.p.) the productivity of diatoms increased once more probably due to renewed ventilation and vertical mixing.
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Acknowledgments
We thank the participants of the 1999 East Sea cruise on the R/V Tamyang for their help with recovery of cores, and two anonymous reviewers and the Editor for their constructive comments and suggestions. K.E. Lee was supported by the BK21 Project and NRL program (2000-N-NL-01-C-012) of the Korean government. J.J. Bahk was supported by Korea Ocean R&D Institute under grant PE83800.
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Lee, K.E., Bahk, J.J. & Narita, H. Temporal variations in productivity and planktonic ecological structure in the East Sea (Japan Sea) since the last glaciation. Geo-Mar Lett 23, 125–129 (2003). https://doi.org/10.1007/s00367-003-0132-3
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DOI: https://doi.org/10.1007/s00367-003-0132-3