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    冲绳海槽末次冰消期以来的浮游有孔虫群落变化及5种古温度转换函数对比

    向荣 刘芳 孙有斌 陈木宏

    向荣, 刘芳, 孙有斌, 陈木宏, 2011. 冲绳海槽末次冰消期以来的浮游有孔虫群落变化及5种古温度转换函数对比. 地球科学, 36(4): 599-609. doi: 10.3799/dqkx.2011.062
    引用本文: 向荣, 刘芳, 孙有斌, 陈木宏, 2011. 冲绳海槽末次冰消期以来的浮游有孔虫群落变化及5种古温度转换函数对比. 地球科学, 36(4): 599-609. doi: 10.3799/dqkx.2011.062
    XIANG Rong, LIU Fang, SUN You-bin, CHEN Mu-hong, 2011. Changes of Planktonic Foraminiferal Assemblages in the Okinawa Trough since the Last Deglaciation and Comparisons of Sea-Surface Temperature Estimated from Five Foraminiferal Transfer Functions. Earth Science, 36(4): 599-609. doi: 10.3799/dqkx.2011.062
    Citation: XIANG Rong, LIU Fang, SUN You-bin, CHEN Mu-hong, 2011. Changes of Planktonic Foraminiferal Assemblages in the Okinawa Trough since the Last Deglaciation and Comparisons of Sea-Surface Temperature Estimated from Five Foraminiferal Transfer Functions. Earth Science, 36(4): 599-609. doi: 10.3799/dqkx.2011.062

    冲绳海槽末次冰消期以来的浮游有孔虫群落变化及5种古温度转换函数对比

    doi: 10.3799/dqkx.2011.062
    基金项目: 

    海洋沉积与环境地质国家海洋局重点实验室开放课题 MASEG200611

    国家重点基础研究发展计划 2010CB428901

    中国科学院知识创新工程资助项目 KZCX2-YW-211

    中国科学院知识创新工程资助项目 KZCX2-YW-228

    国家自然科学基金项目 40976031

    详细信息
      作者简介:

      向荣(1972-),男,研究员,主要从事微体古生物与海洋沉积古环境研究.E-mail: rxiang@scsio.ac.cn

    • 中图分类号: P736.22

    Changes of Planktonic Foraminiferal Assemblages in the Okinawa Trough since the Last Deglaciation and Comparisons of Sea-Surface Temperature Estimated from Five Foraminiferal Transfer Functions

    • 摘要: 通过对冲绳海槽中部A7孔的浮游有孔虫定量分析,对该区18 ka以来的海洋环境变化进行了探讨.浮游有孔虫群落表现出非常明显的冰消期-全新世阶段变化:在18~15 ka的冰消期早期,浮游有孔虫群落以冷水种Neogloboquadrina dutertreiNeogloboquadrina pachyderma等为主;在15~9.4 ka,浮游有孔虫冷水种含量迅速降低;9.4 ka以来的全新世则以暖水种有孔虫Pulleniatina obliquiloculata,Globigerinoides ruberGlobigerina glutinata等为主.此外,浮游有孔虫群落对千年尺度的气候变化如Heinrich 1、博令-阿罗德暖期(Bølling-Allerød)和新仙女木事件(Younger Dryas)都有明显反映,在全新世还记录了一系列的冷事件(约2.3~4.6、5.3、6.2、7.3和8.2 ka).9.4 ka前后浮游有孔虫冷暖种群的变化可能对应了黑潮暖流的突然加强.采用5种不同浮游有孔虫转换函数对表层海水温度进行了估算,通过与Mg/Ca和U37k'温度估算结果对比,对不同转换函数的可靠性进行了评估.结果发现SIMMAX没有明显的冰消期-全新世变化.另两种基于现代类比技术的转换函数MAT和RAM,其估算结果较类似,13 ka以来的温度波动较小,对新仙女木事件没有明显反映.基于Imbrie-Kipp转换函数(FP-12E和IKM-Chen)的估算结果表现出了较大的冰消期-全新世变化,然而对于博令-阿罗德暖期变暖和新仙女木降温事件没有反映,研究发现这主要由Globigerina bulloides的含量变化造成.通过消除与生产力水平密切相关的G. bulloides的含量变化影响,修正后的两种转换函数FP-12E和IKM-Chen较好地反映了末次冰消期以来的表层海水温度波动,与该区Mg/Ca和U37k'方法重建的古温度有较好的可比性.因此,我们认为修正后的转换函数FP-12E和IKM-Chen更适合冲绳海槽中部的古温度估算.

       

    • 图  1  冲绳海槽A7孔及参考孔站位

      Fig.  1.  Locations of core A7 and two reference cores DGKS9604 and MD982195 in the Okinawa Trough DGKS9604(Yu et al., 2009); MD982195(Ijiri et al., 2005)

      图  2  A7孔G.ruber的氧同位素和Mg/Ca比古温度变化(据Sun et al., 2005)

      氧同位素曲线上方年代为AMS14C测年层位,数字为日历年龄(Cal aBP);YD.新仙女木事件;B/A.Bølling-Allerød暖期

      Fig.  2.  Comparison of δ18O and Mg/Ca-based SST of G. ruber in core A7

      图  3  A7孔主要浮游有孔虫属种相对百分含量变化和Mg/Ca比表层海水温度对比

      虚线.全新世的冷事件;红线.9.4 ka黑潮的增强;PME.普林虫低值事件;YD.新仙女木事件;B/A.博令-阿罗德暖期;H1.Heinrich 1事件;暖水种群.G. ruberG. sacculiferG. glutinataP. obliquiloculataG. conglobatusG. menardiiG. tumida的相对含量之和;冷水种群.N. dutertreiN. pachydermaG. quinquelobaG. inflata的相对含量之和

      Fig.  3.  Variations of relative abundance of dominated planktonic foraminiferal species and their comparisons with Mg/Ca-based SST in core A7

      图  4  A7孔5种不同浮游有孔虫转换函数估算的年均表层海水温度(SSTa)与Mg/Ca比温度的比较

      红色箭头.博令暖期和YD结束时的突然升温;黄色箭头.与Mg/Ca比温度相比的异常升温变化;修正FP-12E和修正IKM-Chen.消除G. bulloides含量变化影响后的转换函数估算结果;YD.新仙女木事件;B/A.Bølling-Allerød暖期

      Fig.  4.  Comparison of average annual SST estimated from 5 foraminiferal transfer functions with Mg/Ca-based SST of G. ruber in core A7

      图  5  A7孔5种不同浮游有孔虫转换函数的相似度变化

      蓝色曲线.经过G. bulloides含量修正后的FP-12E和IKM-Chen转换函数共同度;YD.新仙女木事件;B/A.Bølling-Allerød暖期

      Fig.  5.  Variation of communality, similarity and dissimilarity of 5 foraminiferal transfer functions in core A7

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