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MIS 6期以来西菲律宾海表层营养物质水平演化及其控制因素:浮游有孔虫Globigerinoides ruber的Cd/Ca证据
郭景腾1, 李铁刚2, 熊志方2, 仇晓华3, 秦秉斌2, 常凤鸣1
1.中国科学院海洋研究所 海洋地质与环境重点实验室;2.国家海洋局 第一海洋研究所;3.山东省第一地质矿产勘查院
摘要:
浮游有孔虫Cd/Ca可被用于重建古海水中的营养物质浓度,提供营养物质循环信息,因此在古海洋学研究中受到广泛关注。然而,热带西太平洋现有的古海洋学研究成果中,较少涉及浮游有孔虫Cd/Ca指标。本文通过西菲律宾海MD06-3052孔浮游有孔虫Globigerinoides ruber的Cd/Ca比值变化研究及其与陆源物质输入、海水结构以及海洋初级生产力等重建结果对比,从营养物质来源和利用两方面,探究了MIS 6期以来该区域表层营养物质水平演化及其控制因素,从而为热带西太平洋生物泵作用和营养物质循环提供新思路和新证据。MIS 6期以及MIS 2-3期研究区吕宋岛来源的陆源物质输入增多,导致了研究区MIS 6晚期、MIS 3早期和MIS 2期浮游有孔虫G. ruber Cd/Ca比值的升高。而在MIS 3晚期,尽管陆源物质输入量大、次表层营养物质上涌,但初级生产力对于营养物质的利用量大于前两者营养物质输入量之和,最终形成研究区浮游有孔虫G. ruber Cd/Ca比值在MIS 3晚期呈现逐渐降低的趋势。海平面的迅速升高导致营养物质来源短期不足引起MIS 6/5冰消期浮游有孔虫G. ruber Cd/Ca比值呈现低值。而MIS 5e期研究区陆源物质输入的增多,又促使浮游有孔虫G. rube Cd/Ca比值出现高值。此外,MIS 4-5d期,陆源物质输入较低、次表层营养物质仍受到阻碍,但研究区初级生产力在MIS 4-5d期则逐渐升高,致使研究区浮游有孔虫G. ruber Cd/Ca比值呈现下降趋势。研究结果反映不同时期浮游有孔虫G. ruber Cd/Ca比值的受控因素不同,需要对其从营养物质来源和利用两方面因素加以考虑,才能获得更为准确的研究结果。
关键词:  浮游有孔虫  Cd/Ca  营养物质  陆源物质  初级生产力
DOI:10.11759/hykx20180319002
分类号:N34
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
The variations and controls of surface ocean nutrient concentration in the West Philippine Sea since MIS 6: evidence from Cd/Ca in planktonic foraminifera Globigerinoides ruber
GUO Jingteng1, LI Tiegang2, XIONG Zhifang2, QIU Xiaohua3, QIN Bingbin2, CHANG Fengming1
1.CAS Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences;2.First Institute of Oceanography, State Oceanic Administration;3.No Institute of Geology and Mineral Resources of Shandong Province
Abstract:
Planktonic foraminiferal Cd/Ca ratios have been used to reconstruct past changes in surface ocean nutrient concentration, providing information on oceanic nutrient cycling. Therefore, this method has received considerable attention in paleoceanography studies. However, previous planktonic foraminiferal Cd/Ca reconstructions are relatively scarce in the tropical western Pacific. Compared the variation of Cd/Ca ratio of planktonic foraminifera Globigerinoides ruber for core MD06-3052 in the West Philippine Sea with the reconstructive results of terrigenous input, upper water body structure and marine primary productivity, from the two aspects of nutrient contribution and utilization, we investigate the variations and controls of surface ocean nutrient concentration in the West Philippine Sea since MIS 6, providing new insights for the biological pump and oceanic nutrient cycling. The increases in G. ruber Cd/Ca during later MIS 6, early MIS 3 and MIS 2 likely resulted from the increases in Luzon-sourced terrigenous inputs during MIS 6 and MIS 2-3. During later MIS 3, G. ruber Cd/Ca shows a downward trend, although the terrigenous input and local upwelling intensity are high during this interval. We suspect that nutrient utilization overwhelm the terrigenous input and upwelling, resulting in a decrease in G. ruber Cd/Ca during later MIS 3. G. ruber Cd/Ca reached a minimum during the MIS 6/5 deglaciation, which was caused by a sea level rise-induced low nutrient input. But the increased terrigenous input in the study area keeps G. ruber Cd/Ca in higher values during MIS 5e. In addition, from MIS 5d to 4, the terrigenous input was low, and the upwelling of subsurface nutrient were still hindered. However, the primary productivity gradually increased during this interval, which means increased nutrient utilization resulted in a decrease in G. ruber Cd/Ca. The results suggest the controls of Cd/Ca ratios in planktonic foraminifer G. ruber are complicated, and both nutrient sources and nutrient utilization should be considered in Cd/Ca proxy interpretation.
Key words:  Planktonic foraminifera  Cd/Ca  Nutrient  Terrigenous materials  Primary productivity
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