Application of Planktonic Foraminifera Size-Normalized Shell Weight in the Western Pacific
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摘要: 使用标准化壳体重量法和传统壳体重量法分别对中国南海(South China Sea,简称SCS)站表层沉积物和MD06-3052岩心沉积物样品进行了测试,获得了浮游有孔虫种属Globigerinoides ruber(G. ruber)的标准化壳体重量和传统壳体重量.通过对SCS站表层沉积物中G. ruber标准化壳体重量与传统壳体重量的比较,认为在该海域使用标准化壳体重量替代性指标能够更好的排除壳体粒径的干扰.通过对MD06-3052岩心中G. ruber标准化壳体重量与南极Vostok冰心的CO2浓度(pCO2)曲线进行对比,认为标准化壳体重量方法能够较好的反映出表层海水[CO32-]的变化.标准化壳体重量方法快速简便,指示性好,在探讨晚更新世以来表层海水在全球碳循环的重要作用中,是一个很有潜力的指标.Abstract: Planktonic foraminifera Globigerinoides ruber (G. ruber) shell weight of sediment samples from South China Sea (SCS) located in the South China Sea and MD06-3052 located in the western Pacific are tested using size-normalized shell weight method and traditional shell weight method. In comparison with traditional shell weight method, SCS data indicate that the size-normalized shell weight method for G. ruber can significantly reduce the influence of test size on foraminifera shell weight in the study area. Comparing the variation curves of CO2 concentration (pCO2) recorded in Vostok ice core, MD06-3052 G. ruber data show that size-normalized shell weight can indicate the change of sea surface water [CO32-] more effectively. The size-normalized shell weight method provides a reliable and rapid proxy for the weight analyses in the paleoceanographic study, and a potential proxy in studying the influence of surface sea water in global carbon cycle since Late Pleistocene.
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表 1 MD06-3052岩心浮游有孔虫G. ruber标准化壳体重量及传统壳体重量
Table 1. Size-normalized shell weight and traditional shell weight of planktonic foraminifera G. ruber from MD06-3052
样品号 样品层位(cm) 年代(ka BP) 壳体数量(个) 传统壳体重量(μg) 标准化壳体重量(μg) 1 54~56 3.34 6 7.83 8.84 2 182~184 10.58 11 8.45 10.60 3 238~240 14.45 6 12.50 12.97 4 278~280 19.00 13 14.85 14.07 5 342~344 24.41 11 13.00 13.23 6 390~392 28.00 9 12.89 12.97 7 430~432 30.86 6 12.33 12.73 8 486~488 34.87 11 12.64 13.02 9 574~576 41.17 11 13.64 13.84 10 646~648 46.25 11 11.27 12.46 11 678~680 48.32 8 10.00 11.06 -
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