俞宙菲^1,,
李保华^1,,,
李宏亮²,
张静静²,
陈建芳²
1. 现代古生物及地层学国家重点实验室、中国科学院生物演化与环境卓越创新中心, 中国科学院南京地质古生物研究所, 江苏 南京 210008
2. 自然资源部海洋生态系统动力学重点实验室, 自然资源部第二海洋研究所, 浙江 杭州 310012

基金项目: 中国科学院（B类）战略性先导科技专项项目（批准号：XDB26000000）、自然资源部"全球变化与海气相互作用"专项项目（批准号：GASI-03-01-06-02）、国家自然科学基金项目（批准号：41776073、41906058和41906045）和中央级公益性科研院所基本科研业务费专项资金资助项目（批准号：JT1501）共同资助


详细信息

作者简介: 俞宙菲, 女, 32岁, 助理研究员, 海洋地质专业, E-mail:zfyu@nigpas.ac.cn

通讯作者: 李保华, E-mail:bh-li@nigpas.ac.cn

中图分类号: P722.7;Q915.811⁺1

收稿日期:2019-11-02
修回日期:2020-01-22
刊出日期:2020-05-30

Response of modern planktonic foraminifera to the upwelling activity in the southwestern South China Sea

Yu Zhoufei^1,,
Li Baohua^1,,,
Li Hongliang²,
Zhang Jingjing²,
Chen Jianfang²
1. State Key Laboratory of Palaeobiology and Stratigraphy, Centre for Excellence in Life and Paleoenvironment, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu
2. Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, Zhejiang


More Information

Corresponding author: Li Baohua,E-mail:bh-li@nigpas.ac.cn

MSC: P722.7;Q915.811⁺1

--> Received Date: 02 November 2019
Revised Date: 22 January 2020
Publish Date: 30 May 2020


摘要
摘要:现代夏季风系统导致了南海西南部（越南岸外）上升流的发育，但浮游有孔虫对夏季上升流的响应如何尚缺乏实测资料，这不利于准确地利用有孔虫来重建古上升流的活动进而反演过去夏季风的强度变化。本研究利用2014年4月14日至11月1日布放于南海西南部夏季上升流区的时间序列沉积物捕获器材料，详细鉴定并定量统计了其所含浮游有孔虫类型。通过分析样品中浮游有孔虫各属种的通量和百分含量变化，结合区域气候环境资料，探讨南海西南部夏季上升流区浮游有孔虫对夏季风的响应，为古上升流与夏季风研究提供现代依据。研究结果表明初级生产力是控制上升流区浮游有孔虫通量变化的首要因素，喜营养种在上升流发育期增多而寡营养种含量下降。因此高表层生产力指示种，如Neogloboquadrina dutertrei可能是追溯南海西南部夏季上升流变化最可靠的指标。
关键词: 沉积物捕获器/
上升流/
南海/
夏季风/
浮游有孔虫

Abstract:The Asian monsoon plays a pivotal role in the climate change of the South China Sea(SCS), inducing a prominent upwelling activity off Vietnam in the southwestern SCS when modern summer monsoon prevails. As a credible tool for paleoceanographic reconstruction, planktonic foraminifera is widely used in paleo-upwelling studies worldwide. However, the in-situ response of planktonic foraminifera to the summer upwelling induced by modern southwest summer monsoon in the southwestern SCS is still unclear, which hinders more accurate reconstruction of the paleo-summer monsoon variation by deciphering the upwelling activity through planktonic foraminifera.
In this study, we explored the response of planktonic foraminifera to the summer upwelling activity in the southwestern SCS by comparing the variations in the flux and percentage of planktonic foraminifera from a time series sediment trap SCS-VW(13°00'N, 111°30'E) deployed within the summer upwelling area operated from 14th April to 1st November, 2014 with the in-situ sea surface temperature, wind speed and chlorophyll data from NOAA(National Oceanic and Atmospheric Administration)and Argo(Array for Real-time Geostrophic Oceanography). The development of the upwelling activity in the southwestern SCS was characterized by the decreased sea surface temperature and the depth of the thermocline, as well as the increased wind speed and surface water chlorophyll from June to August, 2014.151~497 foraminiferal specimens were identified from each of the 9 samples, belonging to 12 genera and 18 species. The flux and percentage of high-productivity species(G.ruber, G.glutinata, N.dutertrei, G.tenella, G.bulloides, P.obliquiloculata and G.falconensis)increased and the low-productivity species(G.sacculifer, G.calida and G.siphonifera)decreased during the upwelling prevailing period. Additionally, the total abundance of the mixed layer species(G.ruber, G.sacculifer and G.glutinata)decreased and that of thermocline species(N.dutertrei, P.obliquiloculata and G.scitula)increased in response to the shoaling thermocline. In conclusion, primary productivity serves as the most important control on the response of the planktonic foraminifera in the upwelling area, high productivity species such as Neogloboquadrina dutertrei might be one of the most reliable indicators for the upwelling activity in the southwestern SCS. Moreover, total abundance of mixed layer/thermocline species could also be used as an indicator of thermocline variation induced by the upwelling activity.
Key words:sediment trap/
upwelling/
South China Sea/
summer monsoon/
planktonic foraminifera



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