Benthic foraminifera in the Nakdong River Delta (southeast Korea) and their response to middle Holocene climatic change in the coastal environment of the East Asian margin SCIE SCOPUS

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Title
Benthic foraminifera in the Nakdong River Delta (southeast Korea) and their response to middle Holocene climatic change in the coastal environment of the East Asian margin
Author(s)
Takata, Hiroyuki; Irino, Tomohisa; Katsuki, Kota; Woo, Han Jun; Lee, Jun Ho; Lim, Hyoun Soo; Ha, Sangbeom; Khim, Boo-Keun
KIOST Author(s)
Woo, Han Jun(우한준)Lee, Jun Ho(이준호)
Alternative Author(s)
우한준; 이준호
Publication Year
2022-08
Abstract
Fossil benthic foraminifera from five cores in the Nakdong River Delta (southeast Korea) were investigated to reveal paleoenvironmental changes across the middle/late Holocene transition, particularly focusing on ∼4 ka climatic event. Based on multi-dimensional scaling, benthic foraminifera are divided into (1) Marine taxa, (2) Bay taxa, and (3) Opportunistic taxa. Planktonic/total (benthic and planktonic) foraminiferal ratio decreased abruptly during 4.6–3.3 ka, and Nonionella stella was found commonly across ∼4 ka in core ND-01 (intermediate site among the five cores). These results imply that the ∼4 ka climatic event led to the stratification of less saline epilimnetic water underlain by more saline oxygen-poor hypolimnetic water in the Nakdong River Delta. This indicates temporal increase in precipitation in the Nakdong River drainage, which can be attributed to the intensified rainfall with the second Changma peak, associated with typhoons toward the Korean Peninsula. The small twin maxima of N. stella across ∼4 ka in core ND-01 were similar to those of the total sulfur contents in both Yeja Bay (southern Korea) and Lake Togo-ike (southwestern Japan). Such similarity in the stratigraphic patterns among the remote locations can be explained by the small-scale sea-level variations with the fluctuation of the Tsushima Warm Current, in addition to changes in precipitation. The common species of Haynesina sp. A was replaced by Elphidium somaense after ∼4.6 ka, which is likely due to the shift of passive dispersal as a result of the enhanced East Asian winter monsoon and/or the change in the westerly jet path.
ISSN
1367-9120
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/42509
DOI
10.1016/j.jseaes.2022.105273
Bibliographic Citation
Journal of Asian Earth Sciences, v.234, 2022
Publisher
Pergamon Press Ltd.
Keywords
Faunal analysis; 4 ka climatic event; Precipitation; Tsushima Warm Current; Second Changma
Type
Article
Language
English
Document Type
Article
Publisher
Pergamon Press Ltd.
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