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  

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

作　　者：邹杨浩 冉莉华[2] Martin G Wiesner 刘飞 梁文[2] 陈建芳 刘连文[1] ZOU Yanghao;RAN Lihua;Martin G Wiesner;LIU Fei;LIANG Wen;CHEN Jianfang;LIU Lianwen(Key Laboratory of Surficial Geochemistry,Ministry Of Education ,School of Earth Science and Engineering,Nanjing University,Nanjing210023 , China;Key Laboratory of Marine Ecosystem and Biogeochemistry,Second Institute of Oceanography. Ministry of Land Resources. Hangzhou 310012, China;Institut fiir Biogeochemie und Meereschemie、Universitat Hamburg,Bundesstrasse 55, D-20146 Hamburg, Germany)

机构地区：[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,Universitat Hamburg

出　　处：《海洋地质与第四纪地质》2019年第2期123-133,共11页Marine Geology & Quaternary Geology

基　　金：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)

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。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 SONNE187 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.

关 键 词：上升流 生源沉积 陆源输入 末次间冰期以来 南海 

分 类 号：P736.21[天文地球—海洋地质]