Paleoproductivity and its environmental constraints in the Scotia Sea, Antarctica since 34 ka BP

Yang Chunli; Chen Zhihua; Xiao Wenshen; Wang Xiangqin; Ju Mengshan; Cui Yingchun; Huang Yuanhui; Tang Zheng

doi:10.12284/hyxb2021051

Volume 43 Issue 3

Apr. 2021

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Yang Chunli，Chen Zhihua，Xiao Wenshen, et al. Paleoproductivity and its environmental constraints in the Scotia Sea, Antarctica since 34 ka BP[J]. Haiyang Xuebao，2021, 43(3)：116–125 doi: 10.12284/hyxb2021051

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Paleoproductivity and its environmental constraints in the Scotia Sea, Antarctica since 34 ka BP

doi: 10.12284/hyxb2021051

1.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanology, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
3.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

Received Date: 2020-01-08
Rev Recd Date: 2020-04-13

Available Online: 2021-03-27

Publish Date: 2021-04-23

Abstract

Abstract

Paleoproductivity and environmental evolution since 34 ka BP in the southeastern Scotia Sea, Antarctica were reconstructed by the chronological analyses of biogenic opal (BSiO₂), organic nitrogen (N_org), TFe₂O₃ and organic nitrogen isotopes (δ¹⁵N_org) in Core DC-11. Changes in BSiO₂ and N_org contents are basically consistent with the Antarctic temperature, being higher in warm times. δ¹⁵N_org is coincident with the Antarctic sea ice, being greater and reflecting enhanced nitrate utilization in surface water during cold periods. From Last Glacial, Last Deglaciation to Holocene, paleoproductivity and environment changed significantly, and the millennial variability such as the Antarctic Cold Reversal (ACR) is prominent in the study area. Sea ice plays an important role in correlations between the climate, nutrients and paleoproductivity. The increase of sea ice during the glacial or cold periods caused stronger stratification of surface waters, weaker upwelling of deep waters and their dissolved nutrients to the surface ocean, and then resulted in enhanced nitrate utilization and lower paleoproductivity in surface water. Iron supply in the study area is sufficient in present-day and Holocene while it is excessive during Last Glacial and Last Deglaciation due to more developed dust, which is obviously different from that in the Subantarctic Zone.
- Antarctica,
- the Scotia Sea,
- paleoproductivity,
- nutrients,
- sea ice,
- stratification of surface waters

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