Late Quaternary cyclic variations of ice sheet and paleoproductivity in the Amundsen Sea sector, Antarctica

Ju Mengshan; Chen Zhihua; Zhao Renjie; Wang Xiangqin; Huang Yuanhui; Ge Shulan; Tang Zheng

doi:10.3969/j.issn.0253-4193.2019.09.004

Volume 41 Issue 9

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Ju Mengshan，Chen Zhihua，Zhao Renjie, et al. Late Quaternary cyclic variations of ice sheet and paleoproductivity in the Amundsen Sea sector, Antarctica[J]. Haiyang Xuebao，2019, 41(9)：40–51，doi:10.3969/j.issn.0253−4193.2019.09.004

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Late Quaternary cyclic variations of ice sheet and paleoproductivity in the Amundsen Sea sector, Antarctica

doi: 10.3969/j.issn.0253-4193.2019.09.004

Ju Mengshan^{1, 2
,},
Chen Zhihua^{1, 2
,
,},
Zhao Renjie¹,
Wang Xiangqin¹,
Huang Yuanhui¹,
Ge Shulan^{1, 2},
Tang Zheng¹

1.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China

Received Date: 2019-01-07
Rev Recd Date: 2019-02-28

Available Online: 2021-04-21

Publish Date: 2019-09-25

Abstract

Abstract

Core AMS01 dredged on the northwestern continental rise of the Amundsen Sea was used to reconstruct the history of ice sheet and paleoproductivity since MIS9 (about 34 ka BP) based on the analyses of color reflectance, grain size and geochemical proxies. The results show that: (1) Grain size and paleoproductivity proxies of the core exhibits evident glacial–interglacial cycles of Quaternary; (2) The interglacials such as MIS9, MIS7 and MIS5 have low sedimentation rates, brown sediments, low ice-rafted detritus (IRD) contents and high paleoproductivity, indicating warm climate, limited sea ice and large-scale retreat of the ice sheet in the Amundsen Sea sector; (3) Glacial ages such as MIS8c, MIS8a, MIS6 and MIS2 have relatively high sedimentation rates, gray sediments, high IRD and low biological components, which indicate the ice sheet expanded greatly to the edge of the continental shelf, and the continental rise became a proximal environment close to the grounded ice sheet and/or floating ice shelf with dense sea ice and icebergs, and significantly lowered marine productivity; (4) In the glacials and interglacials, ice sheet and paleoproductivity also have certain fluctuations, especially in MIS8b interstadial, the light brown sediments with low IRD and elevated marine productivity make it be like the environment of interglacial period, which indicates that the ice sheet and ocean in the Amundsen Sea sector are more sensitive to climate change than those in the East Antarctica.
- West Antarctica,
- the Amundsen Sea,
- Late Quaternary,
- ice sheet,
- paleoproductivity

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References

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