南海北部1144站中更新世浮游有孔虫的千年尺度古气候记录

郑范; 李前裕; 陈木宏

南海北部1144站中更新世浮游有孔虫的千年尺度古气候记录

基金项目:

国家自然科学基金项目 4999560

国家自然科学基金项目 40476030

国家自然科学基金项目 40576031

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

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.ac.crl

中图分类号: P532
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出版历程
- 收稿日期: 2006-03-06
- 刊出日期: 2006-11-25

A Millennial Scale Mid-Pleistocene Paleoclimate Record of Planktonic Foraminifera from the Northern South China Sea Site 1144

摘要

摘要: 南海北部ODP1144站中更新世气候转型时期的浮游有孔虫在千年尺度上以高频率变化为主要特征.冰期旋回主要周期在0.9Ma由41ka转变为100ka, 浮游有孔虫组合也随冰期旋回出现大量的冷水种.据转换函数得出的表层水降温高达10℃发生在0.9~0.6Ma间的转型过渡期, 跨越MIS22、20、18、16四大冰期.同时, 温跃层深度呈阶梯式变浅, 在MIS20上升至65m左右.所以, 南海北部上层水体环境在中更新世气候转型期出现比末次冰期更重的δ¹⁸O值, 温跃层变浅, 深水种含量降低或消失, 突出了边缘海区南北气候梯度反差和冬季风在冰期增强的讯号.南海南北部的环境差异与东西太平洋的差异, 共同表明低纬过程在气候变化中的重要性.
- 冰期旋回 /
- 中更新世 /
- 气候转型 /
- 冬季风 /
- 浮游有孔虫 /
- 南海
Abstract: Planktonic foraminifera results from ODP Site 1144 in the northern South China Sea indicate that the Mid-Pleistocene climate transition is characterized by high-frequency changes on the millennial scale. In pace with glacial-interglacial cycles after the dominant glacial cyclicity shifted from 41 ka to 100 ka over the ~0.9 Ma, sudden increases in the abundance of cool-water planktonic foraminifera species became more evident. The SST variations estimated from transfer function show large decreases of up to 10 ℃ during the four major glacial periods of MIS22, 20, 18 and 16 between 0.9-0.6 Ma. Cooler conditions in glacial times also caused the thermocline depth to shoal in steps to a minimum of about 65 m at MIS20. Therefore, during the Mid-Pleistocene climate transition, the upper ocean water environment in the nouthern South China Sea was marked by δ¹⁸O values heavier than the last glacial maximum, a shoaled thermocline, and significant decrease to almost complete absence of several deep-water planktonic foraminiferal species, amplifying the paleoclimatic signals of SST contrasts between the northern and southern South China Sea and a strengthened winter monsoon on the millennial scale. Together with the E-W equatorial Pacific record, the N-S contrasts in the South China Sea demonstrate the significance of low latitude process in climate change.
- glacial cycle /
- Mid-Pleistocene /
- climate transition /
- winter monsoon /
- planktonic foraminifera /
- South China Sea.

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图 1 ODP 1144站位图(Wang et al., 2000)

箭头指示夏季主要表层水流方向

Fig. 1. Location of ODP Site 1144 and other site localities in the South China Sea

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图 2 ODP 1144站氧同位素分期MIS14-29 (Bühring et al., 2004)、生物/地层事件、主要浮游有孔虫丰度和浮游有孔虫溶解指数

箭头分别代表暖水种群和冷水种群丰度在长尺度上的变化趋势

Fig. 2. ODP Site 1144 oxygen isotopic results, showing marine isotope stages (MIS) 14 to 29 (Buhringet al., 2004), faunal-stratigraphic events, abundance of major planktonic foraminifera and FDX

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图 3 ODP 1144站氧同位素年龄与分期, 估算冬夏水温及温差和冷水种丰度

如箭头所示, 冬季水温从1.01 Ma以来逐渐降低至MIS23/22处的“中更新世革命”, 温度波动也达到最大

Fig. 3. Time plot of δ¹⁸O, the estimated winter and summer SST and their differences ΔSST, and abundance profiles of the cool water species of ODP Site 1144

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图 4 南海ODP 1144站δ¹⁸O与开放西太平洋MD97-2140孔δ¹⁸O和Mg/Ca平均水温对比(De Garidel-Thoron et al., 2005)

Fig. 4. Comparison between ODP Sites 1144 δ¹⁸O and MD97-2140 δ¹⁸O and Mg/Ca-derived SST from the open West Pacific

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图 5 中更新世气候转型期浮游有孔虫在千年尺度上随冰期旋回变化的主要特征

箭头指示千年尺度上的主要变化趋势.直线分别表示末次盛冰期δ¹⁸O平均值, 全新世δ¹⁸O平均值, 以及不同时间段的表层水温差平均值

Fig. 5. Major characteristics of Mid-Pleistocene planktonic foraminifer changes with glacial cycles on a millennial time scale

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