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
计量
- 文章访问数: 4164
- HTML全文浏览量: 831
- PDF下载量: 14
- 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

下载: 全尺寸图片幻灯片

图 2 岩心位置

Fig. 2. Location of cores

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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)

Bender, M.L., Lorens, R.B., Williams, D.F., 1975. Sodium, magnesium and strontium in the tests of planktonic foraminifera. Micropaleobiology, 21: 448-459. doi: 10.2307/1485293
Boyle, E., 1991. Aquaternary oceanpaleochemistry. Review of Geophysics, 4: 634-638.
Brown, S.J., Elderfild, H., 1996. Variations in Mg/Ca and Sr/Ca rations of planktonic foraminifera caused by postdepositional dissolution: Evidence of shallow Mg-dependent dissolution. Paleoceanoanography, 11(5): 543-551. doi: 10.1029/96PA01491
Chen, P., 2003. Research on the chemical indications of planktonic foraminifera shell in paleoceanography: Evidence from the sedimentary records of the NE Indian ocean during the last 260 ka. Thesis for the Ph. D. China University of Geosciences, Beijing, 99(in Chinese).
CLIMAP Project Members, 1981. Seasonal reconstruction of the earth's surface at the last glacial maximum. Geological Society of America Map and Chart Series MC-36.
Cronblad, H.G., Malmgren, B.A., 1981. Climatically controlled variation of strontium and magnesium in Quaternary planktonic foraminifera. Nature, 291: 61-64. doi: 10.1038/291061a0
Delaney, M.L., Be, W.H., Boyle, E.A., 1985. Sr, Mg, Na in foraminifera calcite sheels from laboratory culture, sediment traps, and sediment cores. Geochimica et Cosmochimica Acta, 49: 1327-1341. doi: 10.1016/0016-7037(85)90284-4
Elderfield, H., Ganssen, G., 2000. Past temperature and δ¹⁸O of sea surface ocean waters inferred from foraminiferal Mg/Ca rates. Nature, 405: 442-445. doi: 10.1038/35013033
Fang, N.Q., Chen, X.F., Hu, C.Y., et al., 2001. Deep sea sedimentary records in the northeastern Indian Ocean and their response to the uplift of the Qinghai-Xizang plateau. Quaternary Sciences, 21(6): 490-499(in Chinese with English abstract).
Hastings, D. W., Russel, A. D., Emerson, S. R., 1998. Foraminiferal magnesium in Globeriginoides sacculifer as a paleotemperature proxy. Paleoceanography, 13(2): 161-169. doi: 10.1029/97PA03147
Lea, D.W., Pak, D.K., Spero, H.J., 2000. Climate impact of Late Quaternary equatorial Pacific Sea surface temperature variations. Science, 289: 1719-1724. doi: 10.1126/science.289.5485.1719
Levi, C., Labeyrie, L., Elderfield, H., et al., 2002. Assessing the dissolution effect on paleosatinty reconstruction from paired Mg/Ca and δ¹⁸O measurements in the planktonic foraminifer G. ruber. Lecture in Beijing.
Nürnberg, D., Bijma, J., Hemleben, C., 1996. Assessing the reliability of magnesium in foraminiferal calcite as a proxy for water mass temperatures. Geochimica et Cosmochimica Acta, 60(5): 803-814. doi: 10.1016/0016-7037(95)00446-7
Nürnberg, D., Müller, A., Schneider, R.R., 2000. Paleo-sea surface temperature calculations in the equatorial east Atlantic from Mg/Ca rates in planktic foraminifera: A comparison to sea surface temperature estimates from oxygen isotopes, and foraminiferal transfer function. Paleoceanography, 15(1): 124-134. doi: 10.1029/1999PA000370
Rind, D., Peteet, D., 1985. Terrestial conditions at the last glacial maximum and CLIMAP seasurface temperature estimates: Are they consistent? Quaternary Research, 24: 1-22.
Rostekt, F., Bard, E., Beaufort, L., 1998. Sea surface temperature and productivity records for the last 240 ka on the Arabian Sea. Oceanographic Literature Review, 45(7): 1123.
Savin, S.M., Douglas, R.G., 1973. Stable isotope and magnesium geochemistry of recent planktonic foraminifera from the south Pacific. Geol. Soci. Amer. Bull. , 84: 23272342.
Webster, P.J., Streten, N.A., 1978. Late Quaternary ice age climates of tropical Australasia, interpretations and reconstructions. Quaternary Research, 10(3): 279-309. doi: 10.1016/0033-5894(78)90024-8
陈萍, 2003. 浮游有孔虫壳体的若干化学指标及其古海洋学意义: 以东北印度洋260 ka以来古海洋学研究为例. 博士学位论文. 北京: 中国地质大学, 99.
方念乔, 陈学方, 胡超涌, 等, 2001. 东北印度洋深海记录基本特征及其对青藏高原隆升的响应. 第四纪研究, 21(6): 490-499. doi: 10.3321/j.issn:1001-7410.2001.06.004