浮游有孔虫壳体Mg/Ca值——<i>SST</i>的替代性指标

陈萍; 方念乔; 胡超涌; 丁旋

浮游有孔虫壳体Mg/Ca值——SST的替代性指标

陈萍¹,
方念乔^{1, 2},
胡超涌²,
丁旋²

1.
安徽理工大学资源与环境工程系, 安徽淮南 232001
2.
中国地质大学海洋地学研究中心, 北京 100083

基金项目:

国家自然科学基金项目“西太平洋—北印度洋热传输与云贵地区降雨的耦合史研究” 40272074

详细信息

作者简介:
陈萍(1958-), 女, 教授, 1982年本科毕业于安徽理工大学, 2002年获中国地质大学理学博士学位, 主要从事能源、环境与基础地质研究

中图分类号: P53
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- 被引次数: 0
出版历程
- 收稿日期: 2004-04-28
- 刊出日期: 2004-11-25

Mg/Ca Ratio in Planktonic Foraminifera Shells: A Proxy for the SST

1.
Department ofResources and Environment Engineering, Anhui University ofScience and Technology, Huainan 232001, China
2.
Institute of Marine Geology and Geophysics, China University ofGeosciences, Beijing 100083, China

摘要

摘要: 通过对东北印度洋区MD77181和MD81349两支岩心中Globigerinoides sacculifer壳体极为精细的清洗和溶样后, 由ICP-MS测试获得了近260 ka以来Mg/Ca值.结果表明Mg/Ca值与δ¹⁸O值变化趋势较为吻合, 随温度的增加而升高, 浮游有孔虫G.sacculifer壳体Mg/Ca值是海洋表层水温(SST)良好的替代性指标.运用函数式Mg/Ca=0.471 7 exp (0.082 5 * SST)计算表明, 包括印度洋在内的中、低纬地区, LGM时期的SST与全新世的温差大于最初CLIMAP推测的2℃, 很可能达到4℃.
- 浮游有孔虫壳 /
- Mg/Ca值 /
- 海洋表层水温(SST)
Abstract: A series of Mg/Ca ratios of planktonic foraminifera shell Globigerinoides sacculifer in two cores in the NE Indian Ocean were measured by ICP-MS after careful cleaning and dissolving. The results show Mg/Ca ratio and δ¹⁸O change accordingly. The Mg/Ca ratio increases with the rise of temperature. This study demonstrates Mg/Ca ratio of planktonic foraminifera shell may serve as a proxy for the past sea surface temperatures (SST).The formula Mg/Ca=0.471 7exp (0.082 5*SST) was applied to calculating and the result shows that in low and middle latitudes, including the NE Indian Ocean, the difference of SST between LGM and the Holocene is about 4 ℃ which is higher than the 2 ℃ estimated by CLIMAP.
- planktonic foraminifera shells /
- Mg/Ca ratio /
- sea surface temperature

HTML全文

图 1 Mg/Ca值与温度的函数关系

Fig. 1. Relation between Mg/Ca ratio and temperature

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图 2 岩心位置

Fig. 2. Location of cores

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图 3 MD77181和MD81349岩心Mg/Ca与δ¹⁸O变化对比

Fig. 3. Comparison with the change of δ¹⁸O and Mg/Ca ratio in the MD77181 and MD81349 cores

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表 1 Mg/Ca值与古海洋表层水温

Table 1. Mg/Ca ratios and the sea surface temperatures

参考文献(20)

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