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首页> 外文期刊>Journal of Asian earth sciences >Precisely dated AMS ~(14)C marine cores reveal the complexity of millennial-scale Asian monsoon variability in the northern South China Sea (MD972146, MD972148)
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Precisely dated AMS ~(14)C marine cores reveal the complexity of millennial-scale Asian monsoon variability in the northern South China Sea (MD972146, MD972148)

机译:精确的过时的AMS〜(14)C海洋核心揭示了南海北部千禧年尺度的亚洲季风变化的复杂性(MD972146,MD972148)

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摘要

High sedimentation rate (SR) cores retrieved from the South China Sea (SCS) form the basis for studying the marine components of millennial-scale Asian monsoon (AM) variability and for comparison with the AM reconstructions from cave records on land (e.g. Dongge and Hulu). However, carefully correlating the SCS sedimentary records to the cave records that are precisely dated by U/Th methods with resolution of decadal-scale, has not been completed. Such a correlation is essential when comparing AM influences expressed over land and sea, but requires a construction of marine AMS ~(14)C age models that are precise enough to be compared to the cave U/Th age models. For the purpose of establishing such a correlation, this study presents new data from intensive AMS ~(14)C dated marine cores retrieved from the northern SCS (MD972146, MD972148). The discrepancy of marine and cave δ~(18)O record for the interval of ~18-30 ka might be due to the change of marine I4C reservoir age in SCS surface water during the glacial period, and to the change in interhemispheric dominance of the AM systems. With the new AMS ~(14)C dating on MD972146 and MD972148, we examined the millennial-scale records of planktonic foraminifer δ~(18)O and carbonate contents of MD972146, MD97248, and SONNE 17940-2 and compared those records with Dongge-Hulu δ~(18)O record of the past 30 ka. Our results show that in the intervals corresponding to the high-latitude Northern Hemisphere (NH) Younger Dryas (YD) and Heinrich I event (H1), the AMS ~(14)C dated millennial-scale oscillations show relatively heavy δ~(18)O and low carbonate contents, but H2 and H3 are in the opposite direction. Our results indicate the complexity for the marine cores which were used in interpreting the millennial-scale AM variability.
机译:从南中国海(SCS)取回的高沉积速率(SR)岩心构成了研究千禧年规模亚洲季风(AM)变异性的海洋成分,并与陆地洞穴记录(例如Dongge和葫芦)。但是,尚未完成将SCS沉积记录与用U / Th方法精确确定日期且具有年代尺度分辨率的洞穴记录相关联的工作。当比较在陆地和海洋上表达的AM影响时,这种相关性是必不可少的,但需要构建足够精确的海洋AMS〜(14)C年龄模型才能与洞穴U / Th年龄模型进行比较。为了建立这种相关性,本研究提供了从北部南海(MD972146,MD972148)中获取的密集的AMS〜(14)C过时海洋岩心的新数据。 〜18-30 ka间隔的海洋和洞穴δ〜(18)O记录的差异可能是由于冰川期SCS地表水中I4C储层年龄的变化,以及冰期的半球优势度的变化。 AM系统。使用日期分别为MD972146和MD972148的AMS〜(14)C,我们检查了浮游有孔虫δ〜(18)O和MD972146,MD97248和SONNE 17940-2碳酸盐含量的千年记录,并将这些记录与Dongge进行了比较。 -过去30 ka的Huluδ〜(18)O记录。我们的结果表明,在对应于高纬度北半球(NH)的年轻仙女树(YD)和海因里希一世事件(H1)的时间间隔中,AMS〜(14)C历时千年尺度振荡显示出相对较大的δ〜(18 O和低碳酸盐含量,但H2和H3的方向相反。我们的结果表明,用于解释千年尺度AM变异性的海洋岩心的复杂性。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2013年第6期|93-101|共9页
  • 作者单位

    Institute of Applied Geosciences, National Taiwan Ocean University, Keelung, Taiwan,Center for Marine Bioenvironment and Biotechnology, National Taiwan Ocean University, Keelung, Taiwan;

    Institute of Applied Geosciences, National Taiwan Ocean University, Keelung, Taiwan,Center for Marine Bioenvironment and Biotechnology, National Taiwan Ocean University, Keelung, Taiwan;

    Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan;

    Department of Ocean Floor Ceoscience and Center for Earth Surface System Dynamics, Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan,Department of Earth and Planetary Sciences, University of Tokyo, Japan,Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    AMS ~(14)C dating; Oxygen isotope; Carbonate; Monsoon; Cave sediment; South China Sea;

    机译:AMS〜(14)C约会;氧同位素碳酸盐季风洞穴沉积物;南中国海;

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