Changes in surface water masses in the northern East China Sea since the Last Glacial Maximum based on diatom assemblages

Keiko Shirota, Yusuke Okazaki, Susumu Konno, Yosuke Miyairi, Yusuke Yokoyama, Yoshimi Kubota

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

We investigated diatom assemblages for the last 19 ka in a piston core KY07-04 PC01 collected from the northern Okinawa Trough, East China Sea. Most of the diatom taxa in the Core KY07-04 PC01 were subtropical to temperate marine species throughout the core. Pronounced turnover of major diatom groups from periphytic to planktonic taxa occurred during deglaciation between 17 and 14 ka ago. During the Last Glacial Maximum (LGM) to early deglaciation, the representative taxa were Paralia spp., a periphytic diatom abundant in continental shelves of the modern East China Sea covering the Chinese Coastal Water. Relative abundances of Paralia spp. rapidly decreased during 15–14 ka ago, corresponding to sea-level rise, displaced by planktonic taxa such as Thalassionema. Thalassionema nitzschioides varieties living in subtropical water increased since 12 ka and have reached the present level at 8 ka ago, suggesting strengthening the influences of Kuroshio water in the northern East China Sea during the early to middle Holocene. Warm planktonic diatom taxa such as Nitzschia bicapitata also gradually increased from 12 to 8 ka ago. Near the core top, a sudden increase in N. bicapitata might relate to the intensifying Kuroshio during the latest Holocene. [Figure not available: see fulltext.].

本文言語英語
論文番号66
ジャーナルProgress in Earth and Planetary Science
8
1
DOI
出版ステータス出版済み - 12月 2021

!!!All Science Journal Classification (ASJC) codes

  • 地球惑星科学(全般)

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