3.4万年以来南极斯科舍海古生产力演变及其环境制约

杨春丽; 陈志华; 肖文申; 王湘芹; 鞠梦珊; 崔迎春; 黄元辉; 唐正

doi:10.12284/hyxb2021051

3.4万年以来南极斯科舍海古生产力演变及其环境制约

doi: 10.12284/hyxb2021051

杨春丽^{1, 2,},
陈志华^{1, 2, ,},
肖文申³,
王湘芹¹,
鞠梦珊¹,
崔迎春¹,
黄元辉¹,
唐正¹

1.
自然资源部第一海洋研究所自然资源部海洋地质与成矿作用重点实验室，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
3.
同济大学海洋地质国家重点实验室，上海 200092

基金项目: 国家自然科学基金（41676191）；南极重点海域对气候变化的响应与反馈（RFSOCC2020-2025）

详细信息

作者简介:
杨春丽（1994—），女，山东省潍坊市人，主要从事南极海洋沉积学研究。E-mail：13081605851@163.com

通讯作者:
陈志华，男，研究员，主要从事极地海洋沉积学与古海洋学研究。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: 2020-01-08
- 修回日期: 2020-04-13
- 网络出版日期: 2021-03-27
- 刊出日期: 2021-04-23

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

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

摘要

摘要: 本文通过对南极斯科舍海东南部DC-11岩芯生物硅、有机氮、TFe₂O₃与有机氮同位素的年代学分析，重建了该海区3.4万年以来古生产力与环境演变历史。研究结果表明，生物硅、有机氮含量与南极温度变化基本一致，暖期高、冷期低；有机氮同位素值与南大洋海冰变化相吻合，暖期小、冷期大，冷期硝酸盐利用率大于暖期。从末次冰期、末次冰消期至全新世，研究区古生产力与环境变化显著，南极冷倒转等千年尺度的变化明显；海冰在气候、营养盐与古生产力之间起着重要的关联作用。冰期或冷期海冰的加强导致表层水层化加强，深层水及其营养盐的上涌减弱，表层海洋硝酸盐等相对匮乏，生产力降低。研究区现代与全新世铁供应充足，在风尘盛行的末次冰期和冰消期呈过剩状态，明显不同于亚南极。
- 南极 /
- 斯科舍海 /
- 古生产力 /
- 营养盐 /
- 海冰 /
- 表层水层化
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

HTML全文

图 1 斯科舍海取样站位与环流分布（据文献[18-20]修改）

SHW（灰色箭头）：南半球西风带；APF（蓝色虚线）：南极极锋；ACC（灰色箭头）：南极绕极流；SBACC（灰色虚线）：南极绕极流南边界；WG（白色首尾相接的箭头）：威德尔涡流；WSBW（红色箭头）：威德尔海底层水；WSDW（桔色箭头）：威德尔海深层水；WSI（白色细虚线）和SSI（白色粗虚线）：南半球冬季和夏季海冰线；IA（空心箭头）：冰山通道。浅白色虚线为图2所示的营养盐剖面位置

Fig. 1 Map of the Scotia Sea showing Core DC-11 and marine circulation (modified from references [18-20])

SHW (gray arrow): the dominant direction of the Southern Hemisphere Westerlies; APF (dotted blue line): the Antarctic Polar Front; ACC (yellow arrow): the Antarctic Circumpolar Current; SBACC(gray dotted line): the Southern Boundary of the Antarctic Circumpolar Current; WSBW (red arrow): the Weddell Sea Bottom Water; WSDW (brown arrow): the Weddell Sea Deep Water; WG (white arrows end to end): the Weddell Gyre; WSI (white fine dotted line) and SSI (white coarse dotted line): the austral winter and summer sea ice limits, respectively; IA (hollow arrow): the Iceberg Alley. Light white dotted line is the section of nutrients shown in Fig.2

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图 2 37°W附近断面现代硅酸盐（a）与硝酸盐（b）含量分布(据文献[27]修改)

LCDW：绕极深层水下层；UCDW：绕极深层水上层；SAMW：亚南极模态水；AAIW：南极中层水；AABW：南极底层水

Fig. 2 Dissolved silica (a) and nitrate concentrations (b) near longitude 37°W (modified from reference [27])

LCDW: Lower Circumpolar Deep Water；UCDW: Upper Circumpolar Deep Water; SAMW: Subantarctica Mode Water; AAIW: Antarctica Intermediate Water; AABW: Antarctica Bottom Water

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图 3 DC-11岩芯岩性地层与年代框架

a. DC-11岩芯岩性柱；b. EDML 冰芯 nssCa²⁺通量^[31]；c. 岩芯磁化率；d. 岩芯深度−年龄转换曲线

Fig. 3 Lithologic stratigraphy and age model of Core DC-11

a. Lithologic column of Core DC-11; b. Core EDML nssCa²⁺ flux^[31]; c. core susceptibility; d. core depth-age curve

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图 4 DC-11岩芯古生产力、营养盐记录及相关分析

Fig. 4 Paleoproductivity and nutrient records of Core DC-11 and correlation analyses

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图 5 DC-11岩芯记录与其他海洋、冰芯记录的综合对比^[53-54,59]

Fig. 5 Comparison between Core DC-11 and other marine and ice core records^[53-54,59]

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表 1 DC-11岩芯AMS¹⁴C测年结果与年龄控制点

Tab. 1 AMS¹⁴C data and adopted age controls of Core DC-11

深度/cm	测试材料	¹⁴C年龄/cal a BP	校正后日历年龄/cal a BP	有效年龄控制点/cal a BP
0	−	−	−	0
1～2	有机碳	2 840±30	1 486±142	150（1.5 cm）
20～21	有机碳	4 040±30	2 924±157	2 056（20.5 cm）
46～47	有机碳	5 260±30	4 522±177	4 663（46.5 cm）
132～134	有机碳	12 660±40	13 239±131	13 339（133 cm）
194～196	有机碳	20 910±70	23 629±285	19 622*（195 cm）
224～226	有机碳	25 400±100	28 141±312	25 722*（222 cm）
254～256	有机碳	30 810±160	33 698±320	33 698（255 cm）
注：*表示通过DC-11岩芯磁化率曲线与EDML冰芯曲线对比得到的年龄（图3）。

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