罗中原^1,,
何玲慧¹,
董良²,
胡邦琦³,
李清³,
贾国东^1,,
1. 同济大学海洋地质国家重点实验室, 上海 200092
2. 上海交通大学海洋学院, 上海 200030
3. 国土自然资源部青岛海洋地质研究所, 山东 青岛 266071

基金项目: 国土自然资源部青岛海洋地质研究所地质调查项目（批准号：DD20191010）和国家重点研发计划项目（批准号：2018YFC0310001）共同资助


详细信息

作者简介: 罗中原, 男, 24岁, 硕士研究生, 海洋有机地球化学研究, E-mail: 1831701@tongji.edu.cn

通讯作者: 贾国东, E-mail: jiagd@tongji.edu.cn

中图分类号: P593;P723

收稿日期:2020-11-29
修回日期:2021-02-12
刊出日期:2021-07-30

Application of long chain diols to reconstructing Kuroshio Current in the Okinawa Trough during the Middle-Late Holocene

LUO Zhongyuan^1,,
HE Linghui¹,
DONG Liang²,
HU Bangqi³,
LI Qing³,
JIA Guodong^1,,
1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092
2. School of Oceanography, Shanghai Jiaotong University, Shanghai 200030
3. Qingdao Institute of Marine Geology, Ministry of Land and Resources, Qingdao 266071, Shandong


More Information

Corresponding author: JIA Guodong,E-mail:jiagd@tongji.edu.cn

MSC: P593;P723

--> Received Date: 29 November 2020
Revised Date: 12 February 2021
Publish Date: 30 July 2021


摘要
摘要:长链二醇（LCDs）是一类微藻生物标志物，在海洋沉积物中除了能够指示其生物来源，近年来的工作还表明它们能够很好地用于示踪表层海水温度（SST）和营养盐。本文对冲绳海槽北部OTK-6站位的1根中晚全新世柱状沉积物（长度468cm）进行了长链二醇的提取分析，重建了7 ka B.P.以来的表层海水温度和营养盐变化历史，并与前人的黑潮指标变化进行对比。结果显示，在本研究区基于长链二醇的SST指标可能反映的是年均但略偏暖季的温度，其变化曲线与营养盐指标的变化曲线呈反向变化。而且上述温度和营养盐变化历史与前人给出的黑潮强弱变化历史对应较好，表现出黑潮增强时，SST温度升高，营养盐含量降低，与黑潮水的高温寡营养的特点一致。本文结果显示，在6.0~5.2 ka B.P.、4.2~3.5 ka B.P.、2.5~2.1 ka B.P.、1.8~1.4 ka B.P.以及1.1~0.8 ka B.P.前后黑潮对研究区域的影响加强。因此，认为基于长链二醇的温度和营养盐指标有潜力成为重建古黑潮演变的新型代用指标。
关键词: 长链二醇/
海洋表层温度/
营养盐/
黑潮/
全新世

Abstract:The Kuroshio Current is the largest boundary current in the northwestern Pacific and greatly influences regional climate and environments. The variabilities of Kuroshio Current in the modern and past have been receiving great concerns. However, proper proxies to indicate the paleo Kuroshio Current are lacking. In this paper, we try to use the biomarkers of long chain diols(LCDs) as the proxies of the Kuroshio, according to the recent works showing that LCDs can be used to indicate sea surface temperature(SST) and nutrient levels. LCDs in 117marine sediment samples in core OTK-6(29.23°N, 128.13°E; 468cm long) in the northern Okinawa Trough, covering a history since 7 ka B.P. dated by 12 planktonic foraminifera ¹⁴C measurements, were analyzed for their suitability to indicate Kuroshio Current variability. SST and nutrient level were reconstructed and compared with the established Kuroshio variations indicated by the north-south gradient of planktonic foraminiferal δ¹⁸O. The results showed that the reconstructed SSTs based on LCDs(24.0~26.9℃) in this study area may reflect the annual average but slightly bias to warm season temperatures. The change of LCDs-derived SST and nutrient level are in reverse during the Middle-Late Holocene and correspond well to the Kuroshio history as indicated by the published foraminiferal δ¹⁸O gradients. Our data showed that the influence of the Kuroshio on the study area is strengthened around 6.0~5.2 ka B.P., 4.2~3.5 ka B.P., 2.5~2.1 ka B.P., 1.8~1.4 ka B.P., and 1.1~0.8 ka B.P. Collectively, they showed that when the Kuroshio Current increases, the SST rises and the nutrient decreases, which is consistent with the warm and oligotrophic characteristics of the Kuroshio surface water. Therefore, these results indicate the LCDs may be suitable as proxies for the Kuroshio Current and potentially applied to indicating the evolution of the Kuroshio in even longer geological histories.
Key words:long chain diols/
SST/
nutrient/
Kuroshio/
Holocene



PDF全文下载地址:

http://www.dsjyj.com.cn/data/article/export-pdf?id=64b57d07-7d61-4573-b99c-62e1f3e8f786