晚第四纪南极阿蒙森海扇区冰盖与古生产力旋回变化

鞠梦珊; 陈志华; 赵仁杰; 王湘芹; 黄元辉; 葛淑兰; 唐正

doi:10.3969/j.issn.0253-4193.2019.09.004

晚第四纪南极阿蒙森海扇区冰盖与古生产力旋回变化

doi: 10.3969/j.issn.0253-4193.2019.09.004

鞠梦珊^{1, 2,},
陈志华^{1, 2, ,},
赵仁杰¹,
王湘芹¹,
黄元辉¹,
葛淑兰^{1, 2},
唐正¹

1.
自然资源部第一海洋研究所，山东青岛 266061
2.
青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室，山东青岛 266061

基金项目: 国家自然科学基金项目(41676191)；南北极环境综合考察与评估（JDKC01，JDKC03）；国家南极监测网（JDKC05）。

详细信息

作者简介:
鞠梦珊（1994—），女，山东省海阳市人，主要从事南极海洋沉积学研究。E-mail：jumengshan16@163.com

通讯作者:
陈志华，研究员，主要从事极地海洋地质学与沉积物地球化学研究。E-mail：chenzia@fio.org.cn

中图分类号: P736.22
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出版历程
- 收稿日期: 2019-01-07
- 修回日期: 2019-02-28
- 网络出版日期: 2021-04-21
- 刊出日期: 2019-09-25

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

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

摘要

摘要: 本文通过对阿蒙森海西北部陆隆AMS01岩心沉积物颜色、粒度及地球化学等多种指标分析，重建了该地区氧同位素9期(MIS9，大约距今34万年)以来冰盖与古生产力演变历史，结果表明：(1)岩心沉积物粒度与古生产力替代指标表现出明显的冰期–间冰期旋回变化特征；(2)MIS9、MIS7和MIS5等间冰期沉积速率较小，沉积物呈褐色，冰筏碎屑含量低，生源组分含量高，反映出该时期阿蒙森海地区气候温暖，冰盖发生了大规模退缩，冰盖–冰架–冰山等陆源冰对沉积物的影响减弱，海冰覆盖减弱，有利于浮游植物的生长和繁殖；(3)MIS8c、MIS8a、MIS6、MIS2等冰期沉积速率大，沉积物呈灰色，沉积物随之变粗，冰筏碎屑含量高，生源组分含量低，说明该时期冰盖大幅扩张，陆隆区成为近冰盖/冰架沉积环境，海冰和冰山密集，海洋生产力显著降低；(4)冰期、间冰期内，冰盖与古生产力也有不同程度的波动；特别是MIS8b期发育浅褐色间冰阶沉积，冰筏碎屑含量低，生产力水平与间冰期基本持平，说明阿蒙森海地区冰盖、海洋对气候变化的响应比东南极地区敏感。
- 西南极 /
- 阿蒙森海 /
- 晚第四纪 /
- 冰盖 /
- 古生产力
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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图 1 阿蒙森海取样站位与环流分布

红色圆点代表本文研究站位AMS01。海区环流综合文献[16-21]绘制。黑色实线代表南极陆坡锋（ASF）^[17]，紫色实线箭头代表变性绕极深层水（MCDW）^{[16, 18]}，黄色实线箭头代表沿岸流（CC）流向^[16]，黑色虚线箭头代表罗斯涡流（RG）方向^[19]，红色实线箭头代表南极绕极流南边界（SBACC）^[20]；白色点线和白色虚线分别代表南极冬季海冰覆盖线（WSI）和夏季海冰覆盖线（SSI）^[21]

Fig. 1 Map of the Amundsen Sea showing location of sediment core AMS01 and marine circulation

Sediment core AMS01 is marked by the red dot. The circulation is edited from references [16-21]. Black line indicates Antarctic Slope Front (ASF)^[17]; Modified Circumpolar Deep Water (MCDW) ^{[16, 18]}and Coastal Current (CC)^[16] are indicated by the purple and yellow arrows, respectively; black dashed arrow indicates the Ross Gyre (RG)^[19]; red arrows indicate the Southern Boundary (SB) of Antarctic Circumpolar Current (ACC)^[20]; winter sea ice (WSI) and summer sea ice (SSI) are indicated by white dotted line and dashed line, respectively^[21]

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图 2 AMS01岩心岩性地层及年代框架

Fig. 2 Lithogic stratigraphy and age model for Core AMS01

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图 3 AMS01岩心粒度组成与冰筏碎屑含量变化

a. Dome C冰芯温差记录；b.砂含量；c.粉砂含量；d.黏土含量；e.冰筏碎屑（>125 μm）含量；f.可分选粉砂含量；g.可分选粉砂平均粒径

Fig. 3 Downcore variations of grain size and ice-rafted detritus in Core AMS01

a. Dome C △T record; b. sand content; c. silt content; d. clay content; e. ice-rafted detritus (>125 μm) content; f. sortable silt content; g. sortable silt mean size

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图 4 AMS01岩心沉积物各粒级之间的相关性分析

Fig. 4 The correlations between different grain size components

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图 5 AMS01岩心多种生产力替代指标的变化及其与东南极IODP U1361A孔的对比

a. Dome C冰芯温差记录；b.AMS01岩心生源硅含量；c. AMS01岩心Ba/Al比值；d. AMS01岩心颜色反射率参数b*；e.U1361A岩心Ba/Al比值

Fig. 5 Downcore variation of paleoproductivity proxies in Core AMS01, and the comparison with IODP Core U1361A in East Antarctic

a. Dome C △T record; b. biogenic silica content in Core AMS01; c. Ba/Al in Core AMS01; d. b* in Core AMS01; e. Ba/Al in Core U1361A

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表 1 AMS01岩心AMS¹⁴C测年数据与年龄校正

Tab. 1 AMS¹⁴C and calibrated ages of Core AMS01

序号	深度/cm	测年材料	AMS¹⁴C年龄/a BP	碳储库年龄/a	日历年龄/a BP
1	0～2	有孔虫	12 480±40	1 300	12 680±94
2	20～22	有孔虫	18 860±60	1 300	20 700±200
3	36～38	有孔虫	35 250±250	1 300	37 990±412*
4	44～46	有孔虫	38 840±680	1 300	41 620±547*
注：*表示该年龄超出26 ka BP的日历年龄准确校正区间（建议校正区间），只作参考，不作为岩心年代控制点。

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表 2 AMS01岩心各层段年龄与沉积速率估算

Tab. 2 The ages and calculated sedimentation rates for main sections in Core AMS01

控制点特征	深度 /cm	年龄 /ka BP	平均沉积速率 /cm·ka⁻¹
测年结果	1	12.68	—
测年结果	21	20.70	2.49
MIS2/MIS5地层分界	23	21.5/71	—
MIS5/MIS6地层分界	80	130	0.97
MIS6/MIS7地层分界	165	191	1.39
MIS7/MIS8地层分界	238	245	1.35
MIS8a/MIS8b亚层分界	286	279	1.41
MIS8b/MIS8c亚层分界	303	292	1.31
MIS8/MIS9地层分界	340	303	3.36
MIS9底界	373	337	0.97

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