气候变化领域集成服务门户(CCPortal): 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

CCPortal

DOI	10.1016/j.quascirev.2020.106563
	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
	Kim S.; Yoo K.-C.; Lee J.I.; Roh Y.H.; Bak Y.-S.; Um I.-K.; Lee M.K.; Yoon H.I.
发表日期	2020
ISSN	0277-3791
卷号	249
英文摘要	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 productivity 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. © 2020 Elsevier Ltd
英文关键词	Geochemistry; Ice-rafted debris; Marine core; Nutrient utilization; Ocean-cryosphere interaction; Paleoceanography
语种	英语
scopus关键词	Debris; Glacial geology; Grain size and shape; Nutrients; Ocean currents; Productivity; Salinity measurement; Sea ice; Sediments; Silt; Antarctic circumpolar current; Antarctic Peninsula; Grain size characteristics; Last glacial period; Multi-proxy analysis; Nutrient utilization; Sedimentary process; Temporal relationships; Surface waters; Antarctic Circumpolar Wave; biological production; bottom water; ice-rafted debris; Last Glacial; nutrient use; paleoceanography; paleoproductivity; proxy climate record; surface water; Antarctic Circumpolar Current; Antarctic Peninsula; Antarctica; Atlantic Ocean; Elephant Island; Scotia Sea; South Shetland Islands; Southern Ocean; West Antarctica
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151262
作者单位	Korea Polar Research Institute, Incheon, 21990, South Korea; University of Science and Technology, Daejeon, 34113, South Korea; Department of Earth and Environmental Sciences, Jeonbuk National University, Jeonju, 54896, South Korea; Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea
推荐引用方式 GB/T 7714	Kim S.,Yoo K.-C.,Lee J.I.,et al. 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[J],2020,249.
APA	Kim S..,Yoo K.-C..,Lee J.I..,Roh Y.H..,Bak Y.-S..,...&Yoon H.I..(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.
MLA	Kim S.,et al."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(2020).