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西菲律宾海2万年以来浮游有孔虫壳体重量变化
安佰正1,2,3, 李铁刚1,2, 孙晗杰1,2, 于心科1,2, 仇晓华4
1.中国科学院 海洋研究所;2.中国科学院 海洋地质与环境重点实验室;3.中国科学院研究生院;4.山东省第一地质矿产勘查院
摘要:
为探讨2万年以来浮游有孔虫的壳体重量变化及其影响因素, 对取自西菲律宾海MD06-3052岩芯的浮游有孔虫表层种Globigerinoides ruber进行壳体重量分析, 基于氧同位素年龄模式, 获得了2万年以来有孔虫传统壳体重量(WMS)和标准化壳体重量(WSN)变化特征。对比两种壳体重量指标, 发现在本海区标准化壳体重量指标更为准确。结果表明, 2万年以来, 浮游有孔虫WSN具有不断变轻的趋势,整体表现为冰期时壳体重量较重, 而全新世时壳体重量相对较轻的特征。末次冰盛期(Last Glacial Maximum, LGM)以来浮游有孔虫WSN变化曲线同大气CO2浓度变化曲线具有较好的相似性, 推测在该海区控制壳体重量的主要因素为与全球大气CO2相关的表层海水的CO32-浓度。
关键词:  西菲律宾海  浮游有孔虫  壳体重量
DOI:10.11759/hykx20150325001
分类号:
基金项目:中国科学院战略性先导科技专项项目(XDA11030104); 国家海洋局专项(No.GASI-04-01-02); 国家自然科学基金项目(41230959;41206044)
Planktonic foraminifera shell weight record in the West Philippine Sea during the last 20 ka
AN Bai-zheng,LI Tie-gang,SUN Han-jie,YU Xin-ke,QIU Xiao-hua
Abstract:
To investigate the variability and influences of planktonic foraminiferal shell weight in the western Pacific, we determined the mean shell weight (WMS) and shell size-normalized weight (WSN) of Globigerinoides ruber at Site MD06-3052 in the West Philippine Sea during the last 20 ka. Both shell weight proxies show the same lightening trend. The WSN proxy was more accurate than the WMS proxy in our study with relatively fewer G. ruber specimens preserved in the sediments. The WSN results revealed high values during the last maximum glacial period and low values during the Holocene. Compared with the local sea-surface temperature and ice-core CO2 content, the WSN curve reflects the presence of a carbonate ion in the surface seawater, which is a signal of the global CO2 content.
Key words:  West Philippine Sea  planktonic foraminifera  shell weight
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