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赤道太平洋东部第四纪沉积物的两个岩芯,提供了经历几个冰期和间冰期旋迥的海洋状况近于连续的历史.所研究的两个岩芯,都位于海洋学条件复杂的区域,那些地方都出现涌升洋流(图1).RC10-65(No°41′,W108°37′)位于赤道辐散带内,而且在赤道潜流浅水区附近.V19-29(S3°35′,W83°56′)位于秘鲁海岸涌升流区,同时也受到赤道潜流的影响.沉积物中的生物组合可以用来推断水体的位置与古繁殖使用相对数量的变化.由于在表层水中及保存在沉积物中的放射虫的丰度和已知种的分异度已确定,所以在这次作为SPECMAP计划的一部分的研究中,它们被用来推断赤道太平洋东部的古海洋的演变.运用多元统计分析方法的放射虫组合鉴定(如因子(factot)分析),可以把某些种、群与特定的水域联系起来.钻孔岩芯中这些放射虫组合的富集程度的变化,反映了该处有关水体的相对重要的短暂变化.根据这些资料,水体的运动和它的界线都能够得到解释.在太平洋赤道东部这两个采样点,放射虫化石组合丰度的某些变化,也可能表示水面繁殖量的长期性变化.有关这些地区的沉积作用,其他调查者已研究过,Romine(1982)和Molina-Cruz(1977a,b)曾用一个代表短时期的放射虫动物群资料,追索了最近127,000年(同位素所测定的冰期、间冰期1-5阶段)内位置及其水体的比较重要的变化.这次研究扩充了通过几个更明显的气候旋迥的推断对RC10-65和V19-29两地水体所起反应的记录,并揭示出由于海洋气候变化而引起的海洋长期变化趋势.由于气候变化在表面繁殖量和海洋状况方面的变化,将提供控制这种关系的洞察力,或许也能提供变化原因的线索.
The two cores of Quaternary sediments in the eastern equatorial Pacific provide a nearly continuous history of the sea conditions that experienced several glacial and interglacial cycles.The two cores studied are located in areas with very complex oceanographic conditions (Fig. 1) .RC10-65 (No ° 41 ’, W108 ° 37’) is located in the equatorial divergence zone and is near the equatorial shallow current. V19-29 (S3 ° 35 ’ , W83 ° 56 ’) is located in the upwelling area off the coast of Peru and is also affected by the equatorial current, and the biological assemblages in sediments can be used to deduce the relative amount of change in water position and paleoptile use. The abundance of radiolarians in sediments and the degree of differentiation of known species have been determined so they are used to extrapolate the paleocean evolution in the eastern Equatorial Pacific in this study as part of the SPECMAP program.Using multivariate The combination of radiolabear identifications (such as factot analysis) of statistical analysis methods allows the association of certain species and groups with particular waters. The variation in the abundance of these radiolarian assemblages in the borehole core reflects The relative importance of the water body is brief Based on these data, the movement of the water body and its boundaries can all be explained, and some changes in the abundance of the radioactive fossil assemblages at the two sampling points in the eastern equatorial Pacific may also indicate long-term changes in water surface reproduction. Concerning the sedimentation in these areas, other investigators have studied that Romine (1982) and Molina-Cruz (1977a, b) used a short-lived radioactive fauna data to recover the most recent 127,000 years Of the Ice Age and the Interglacial Periods 1-5) and more important changes in their water bodies This study expands on the use of several more pronounced climatic inferences on the water bodies of both RC10-65 and V19-29 Response and reveal the long-term trends in the oceans due to changes in the marine climate that will provide the insight to control this relationship as the changes in surface fertility and the state of the oceans may provide the reasons for the change clue.