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Paleoceanographic changes in the Southern Ocean off Elephant Island since the last glacial period: Links between surface water productivity, nutrient utilization, bottom water currents, and ice-rafted debris

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Title
Paleoceanographic changes in the Southern Ocean off Elephant Island since the last glacial period: Links between surface water productivity, nutrient utilization, bottom water currents, and ice-rafted debris
Other Titles
지난 마지막 빙하기 이후 남극반도 엘리펀트 섬 주변 남빙양의 고해양학적 변화: 표층생산성, 영양염 이용률, 저층 해류와 빙하쇄설성 퇴적물의 연관
Authors
Kim, Sunghan
Yoo, Kyu-Cheul
Lee, Jae Il
Roh, Youn Ho
Bak, Young-Suk
Um, In-Kwon
Lee, Min Kyung
Yoon, Ho Il
Subject
Physical Geography; Geology
Keywords
Paleoceanography; Marine core; Geochemistry; Nutrient utilization; Ocean-cryosphere interaction; Ice-rafted debris
Issue Date
2020-12
Citation
Kim, Sunghan, et al. 2020. "Paleoceanographic changes in the Southern Ocean off Elephant Island since the last glacial period: Links between surface water productivity, nutrient utilization, bottom water currents, and ice-rafted debris". QUATERNARY SCIENCE REVIEWS, 249(1): 106563-106563.
Abstract
To understand past changes in ocean-cryosphere interactions in the Southern Ocean off the Antarctic Peninsula, multi-proxy analyses of three sediment cores located off Elephant Island were used to reconstruct changes in paleoproductivity, nutrient utilization, bottom current intensity, and iceberg calving since the last glacial period. The glacial period was characterized by low surface water produc-tivity with high nutrient utilization, indicating surface water stratification. During the deglaciation, surface water productivity increased with decreasing nutrient utilization, implying that the increase is associated with increased nutrient supply from the subsurface water by enhancing Antarctic Circumpolar Current (ACC) influence as fronts migrate southward with warming. Abundant occurrence of grains >1 mm during the deglacial period indicates rapid ice sheet retreat with large-scale melting and calving. During the glacial period, however, coarse silt-fine sand-sized fraction represented ice-rafted debris (IRD). The different IRD grain size characteristics are thought to be related to the IRD source material characteristics. Regardless of IRD input, the running downcore correlation (5 to 9-point) between sortable silt mean grain size and percentage showed that sediments are well sorted by bottom current. However, the cross plot of them showed different temporal relationships. Sediments were sorted by the ACC and southwestward flowing bottom current. Along with southward migration of fronts and the ACC, southwestward flowing bottom current influence diminished, whereas the ACC influence increased particularly from 7 ka. Our results indicate that the sedimentary processes in the Scotia Sea largely depend on the regional interactions between the ocean and the cryosphere. (C) 2020 Elsevier Ltd. All rights reserved.
URI
https://repository.kopri.re.kr/handle/201206/11861
DOI
http://dx.doi.org/10.1016/j.quascirev.2020.106563
Appears in Collections  
2020-2020, Ice sheet retreat and ocean circulation in West Antarctica during the past warm periods (20-20) / Yoo, Kyu-Cheul (PE20180)
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