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    南海西南部晚更新世500ka以来的古海洋学特征

    郑范 李前裕 陈木宏 邵磊 乔培军 成鑫荣 向荣

    郑范, 李前裕, 陈木宏, 邵磊, 乔培军, 成鑫荣, 向荣, 2005. 南海西南部晚更新世500ka以来的古海洋学特征. 地球科学, 30(5): 534-542.
    引用本文: 郑范, 李前裕, 陈木宏, 邵磊, 乔培军, 成鑫荣, 向荣, 2005. 南海西南部晚更新世500ka以来的古海洋学特征. 地球科学, 30(5): 534-542.
    ZHENG Fan, LI Qian-yu, CHEN Mu-hong, SHAO Lei, QIAO Pei-jun, CHENG Xin-rong, XIANG Rong, 2005. Late Pleistocene Paleoceanographic Characteristics of the Southwestern South China Sea since 500 ka. Earth Science, 30(5): 534-542.
    Citation: ZHENG Fan, LI Qian-yu, CHEN Mu-hong, SHAO Lei, QIAO Pei-jun, CHENG Xin-rong, XIANG Rong, 2005. Late Pleistocene Paleoceanographic Characteristics of the Southwestern South China Sea since 500 ka. Earth Science, 30(5): 534-542.

    南海西南部晚更新世500ka以来的古海洋学特征

    基金项目: 

    国家重大基础研究计划 G2000078500

    中国科学院知识创新项目 KZCX3-SW-220

    国家自然科学基金项目 4999560

    国家自然科学基金项目 40476030

    详细信息
      作者简介:

      郑范(1955),女,助理研究员,主要从事海洋微体古生物研究.E-mail:zhf@scsio.ae.cn

    • 中图分类号: P53

    Late Pleistocene Paleoceanographic Characteristics of the Southwestern South China Sea since 500 ka

    • 摘要: 对湄公河口外MD01-2392孔浮游有孔虫的定量分析, 并采用FP-12E转换函数、MAT现代类比法及温跃层转换函数的计算, 结合氧同位素分析结果, 揭示了南海南部晚更新世近500ka以来的古海洋学演化特征.发现冰期MIS12、MIS8、MIS2-4冬季表层水温明显高出相邻的间冰期, 特别是间冰期MIS9、MIS5、MIS1表层水温都较低.温跃层在MIS5与MIS1最浅, MIS9其次.主要表现在浮游有孔虫深层高营养种的含量增高, 表明上升流增强.间冰期的低水温很可能主要是由于上升流影响所致, 当然表层盐度由于多雨而降低也可能影响到间冰期的水温估算.冰期时较高的表层水温, 喜暖高盐型次表层种Pulleniatina obliquiloculata的大量繁殖, 说明冰期时南部海区受来自北部强冬季风的制约使上升流活动减弱, 海平面降低后与邻区通道的关闭也造成水体置换明显减弱, 可能有淡水盖层发育, 最终导致上层海水分层增强和冬季表层水温保持相对较高.晚更新世时期的南海南部由于冰期低海平面造成半封闭的海盆环境和季风变化, 是影响其浮游有孔虫对冰期旋回响应与北部和开放大洋不同的根本原因.

       

    • 图  1  MD01-2392和邻区有关钻孔的站位

      虚线为28 ℃温度线; 阴影部分为现代上升流区域, 箭头为夏季海流

      Fig.  1.  Location map, showing MD01-2392 and other site localities

      图  2  MD01-2392孔氧同位素分期与邻近海区结果对比

      ODP 1144孔据Bühring et al. (2004); ODP 1143孔据Tian et al. (2002); MD97-2141孔据Oppo et al. (2003)

      Fig.  2.  δ18O results for MD01-2392, as compared to other records from neighboring sea areas

      图  3  主要浮游有孔虫含量、粗组分与碎壳率

      Fig.  3.  Percentage content, coarse fraction (> 0.063 mm) and test fragmentation of main planktonic foraminifera

      图  4  估算的古水温与有孔虫比值及表层暖水种、次表层暖水种、冷水种与氧同位素对比

      表层暖水种包括G. sacculifer, G. conglobatus, G. ruber; 次表层暖水种包括G. menardii, G. tumida, G. aequilateralis, G. conglomerata, P. obliquiloculata, 冷水种包括G. inflata, N. pachyderma, G. quinqueloba, G. bulloides

      Fig.  4.  The estimated paleo-SST, species ratios, relative abundance of warm-water, surface- and subsurface-dwelling species and cool to cold water species, as compared to δ18O results

      图  5  温跃层、表层水温温差、上升流种含量与不同水层浮游有孔虫含量

      表层低营养种: G. ruber, G. sacculifer, G. glutinata; 次表层至深层高营养种: N. dutertrei, N. pachyderma, G. menardii; 上升流种: N. dutertrei, N. pachyderma, G. bulloides.1~4为温跃层深度变化分段

      Fig.  5.  Estimated thermocline depth changes, ΔSST and abundance variations of groups confined to different water layers

      表  1  MD01-2392的表层水古温度与温跃层深度

      Table  1.   The estimated SST and thermocline depth for MD01-2392

      表  2  南海3钻孔同位素6期以来的平均冬季表层古水温比较

      Table  2.   Comparison of estimated average winter SST since MIS6 between 3 South China Sea cores

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    • 收稿日期:  2005-05-17
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