140kaBP以来南海西南部上升流影响区沉积记录及其古海洋环境变化

邹杨浩; 冉莉华; MartinG Wiesner; 刘飞; 梁文; 陈建芳; 刘连文

doi:10.16562/j.cnki.0256-1492.2018031601

140kaBP以来南海西南部上升流影响区沉积记录及其古海洋环境变化

1.
南京大学地球科学与工程学院，表生地球化学教育部重点实验室，南京 210023

2.
国家海洋局海洋生态系统与生物地球化学重点实验室, 杭州 310012

3.
Institut für Biogeochemie und Meereschemie, Universität Hamburg, Bundesstrasse 55, D-20146 Hamburg

基金项目:
重点研发计划“海洋微生物碳泵与生物泵的互作过程与储碳机制”(2016YFA0601101)；国家自然科学基金“南海北部‘生物泵’全深度锚系观测及调控机制研究”(91128212), “南海北部和中部沉积物捕获器中的硅藻记录及其古海洋学意义”(41006034)；国家海洋局第二海洋研究所基本科研业务专项资金项目“2015—2016年厄尔尼诺对南海北部硅藻的影响”(JT1401)

详细信息

作者简介: 邹杨浩(1991—)，男，硕士研究生，主要从事古海洋生物地球化学研究，E-mail：zouyh@smail.nju.edu.cn

通讯作者: 冉莉华(1982—)，女，副研究员，从事海洋微体古生物和生物地球化学研究，E-mail: lihuaran@sio.org.cn

中图分类号: P736.21

蔡秋蓉编辑

收稿日期: 2018-03-16

修回日期: 2018-09-28

刊出日期: 2019-04-28

Sediment records and their paleoceanographic implications in the upwelling area of the southwestern South China Sea during the last 140, 000 years

1.
Key Laboratory of Surficial Geochemistry, Ministry Of Education, School of Earth Science and Engineering, Nanjing University, Nanjing 210023, China

2.
Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Land Resources, Hangzhou 310012, China

3.
Institut für Biogeochemie und Meereschemie, Universität Hamburg, Bundesstrasse 55, D-20146 Hamburg, Germany

More Information

Corresponding author: RAN Linhua, lihuaran@sio.org.cn

Received Date: 16 March 2018

Revised Date: 28 September 2018

Publish Date: 28 April 2019

摘要

摘要:
对南海西南部现代上升流区沉积物柱样BIS-187-61孔有机碳、生物蛋白石、碳酸盐等各沉积组分进行了详细的分析，试图探讨末次间冰期(MIS 5)以来南海西南部夏季上升流影响区沉积过程及其所反映的海洋环境变化过程。研究结果发现，140kaBP以来该孔沉积记录期总体表现为：碳酸盐百分含量冰期低间冰期高，主要受周边陆源物质输入稀释的控制，为典型的“大西洋型碳酸盐旋回”，有机碳、生物蛋白石、碳酸钙以及陆源沉积物的堆积速率均在MIS 2期、MIS 4期和MIS 5e期出现高值。其中，MIS 2期和MIS 4期生源和陆源沉积堆积速率增加可能与冰期时冬季风增强及海平面下降导致陆源营养物质输入增加对初级生产力的刺激有关，也可能与陆源物质输入增加对海洋生源颗粒物输出的压载作用增强有关。而MIS 5e期南海海平面高度与现代相仿，间冰期较强的夏季风引起的越南沿岸上升流增强是导致该时段本研究区域表层初级生产力增强，沉积物总堆积速率及各组分堆积速率都相应增加的主要原因。
- 上升流 /
- 生源沉积 /
- 陆源输入 /
- 末次间冰期以来 /
- 南海
Abstract:
Main sediment components in the modern upwelling area of the southwestern South China Sea during the last 140, 000 years were analyzed for a gravity core retrieved by the SONNE 187 cruise in 2006, aiming to reveal the marine environmental changes in the southwestern South China Sea since the last interglacial. During the last 140, 000 years, the mass percent of carbonate was generally high in interglacial but low in glacial periods, as the typical "Atlantic type of carbonate", suggesting strong influences of the terrestrial input in the southwestern South China Sea. Relatively high accumulation rate of organic carbon, biogenic opal and lithogenic components was found in MIS 2 and MIS 4, related to the enhanced primary productivity provoked by the increase in terrestrial input nutrients, as a result of strengthened winter monsoon and the decline of sea level during the ice age; It might also be related to the enhanced ballast effect of the lithogenic matters of sinking particles during the ice age. At the peak of the last interglacial period (MIS 5e), strengthened upwelling off Vietnam coast induced by stronger summer monsoon was responsible for the increase in primary productivity and accumulation of both biogenic and lithogenic sediments.
- upwelling /
- biogenic sediment /
- terrestrial input /
- Last Interglacial period /
- South China Sea

HTML全文

图 1 沉积物柱样BIS-187-61站位图

Figure 1.

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图 2 柱状样BIS-187-61的年龄框架

Figure 2.

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图 3 南海西南部柱状样BIS-187-61的沉积速率SR(a)，干密度DBD(b)和堆积速率MAR(c)

Figure 3.

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图 4 南海西南部柱状样BIS-187-61孔中有机碳百分含量(a)；生物蛋白石百分含量(b)；陆源物质百分含量(c)；碳酸盐百分含量(d)；有机碳和氮元素比值(e)；XRF中Ca的值(f)

Figure 4.

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图 5 南海西部柱状样BIS-187-61碳酸盐的堆积速率(a)；有机碳堆积速率(b)；生物蛋白石堆积速率(c)；陆源物质的堆积速率(d)

Figure 5.

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图 6 末次间冰期以来南海西南部上升流海域初级生产力和新生产力变化

Figure 6.

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图 7 间冰期(a)和冰期(b)时南海地形地貌^[25]，及末次间冰期以来全球海平面的平均变化(c)

Figure 7.

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表 1 南海不同海域的第四纪古生产力特征

Table 1. Characteristics of the reconstructed productivity in different areas in the SCS

位置	站位	北纬	东经	指标	变化特征	可能的影响因素	参考文献
南海北部	17928	18°9′36″	119°26′24″	底栖有孔虫丰度	末次冰期和MIS 6 期生产力较高	冰期冬季风增强，冬季上升流加强，而且陆源营养物质输入量增加	[31]
南海北部	17937	19°30′	117°39.9′	沉积物中有机碳的含量及不同有机碳比值	生产力在MIS 2期较高	冰期冬季风强化, 海水混合程度加强, 营养物质利用更充分以及陆源输入增多导致营养物质增加	[32]
南海西部	17954	14°48′	111°31′48″	Ba/(Zr+Rb)值底栖有孔虫丰度和有机碳通量	间冰期生产力高， MIS 3期最大	夏季风增强，上升流发育，带来大量营养物质	[33, 34]
	MD05-2901	14°13′12″	110°26′24″	生源组分、颗石藻丰度	冰期生产力高间冰期生产力低、末次冰期生产力最高	冰期海平面下降，陆源物质输入增加，东北风发育也促进生产力的提高	[35, 36]
	BIS-187-61	11°25.5′	111°17.0′	有机碳通量、蛋白石通量	冰期生产力高，间冰期低	冰期陆源物质输入增多，营养物质增多促进生产力提高	本研究
南海南部	ODP1143	9°12′36″	113°10′12″	蛋白石百分含量及其堆积速率钙质超微化石丰度及堆积速率	间冰期生产力高，冰期生产力低	间冰期夏季风增强，上升流增强，营养物质增加	[21, 22]
南海南部	MD05-2896	8°29′24″	111°15′36″	Ba/Al比值	间冰期生产力高， MIS 3期生产力较高	间冰期夏季风增强，上升流增强，陆源有机物质输入增多	[37]

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