SG06, a fully continuous and varved sediment core from Lake Suigetsu, Japan: stratigraphy and potential for improving the radiocarbon calibration model and understanding of late Quaternary climate changes
SG06, a fully continuous and varved sediment core from Lake Suigetsu, Japan: stratigraphy and potential for improving the radiocarbon calibration model and understanding of late Quaternary climate changes
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DOI：
10.1016/j.quascirev.2010.12.013
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发表时间：
2012-03
影响因子：
4
通讯作者：
T. Nakagawa;K. Gotanda;T. Haraguchi;T. Danhara;H. Yonenobu;A. Brauer;Y. Yokoyama;R. Tada;
中科院分区：
文献类型：
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作者：
T. Nakagawa;K. Gotanda;T. Haraguchi;T. Danhara;H. Yonenobu;A. Brauer;Y. Yokoyama;R. Tada;
在过去的二十年里，日本中部水月湖的纹状沉积物提供了一个纯粹的陆地放射性碳校准模型和古气候变化年表的高潜力已被广泛认可。然而，这一潜力尚未完全实现，因为从该湖（“SG 93”）中提取的唯一可用的长沉积物岩心是从一个钻孔中提取的，因此被连续岩心部分之间持续时间未知的间隙所打断。在2006年夏天，一个新的沉积物芯（“SG 06”）从湖中被回收。钻了四个独立的钻孔，发现平行的岩芯组完全重叠，各部分之间没有间隙。这一新记录提供了测试现有大气放射性碳校准模型的能力，以及评估上一次冰期-间冰期循环中古气候变化的区域间领先和滞后的规模。SG 06的多学科分析仍在进行中，但在项目的主要成果发布之前，需要向更广泛的科学界提供对沉积序列的可靠描述，从而能够根据SG 06记录对所有后续发布的数据进行全面的批判性评估。在本文中，我们报告了关于SG 06沉积物岩心的关键岩石地层信息，突出了年度纹层（纹层）的清晰度随深度的变化，以及对气候变化机制的可能影响。我们还讨论了SG 06记录的潜力，以满足INQUA-INTIMATE项目的基本目标。
The high potential of the varved sediments of Lake Suigetsu, central Japan, to provide a purely terrestrial radiocarbon calibration model and a chronology of palaeoclimatic changes has been widely recognised for the last two decades. However, this potential has not been fully realised since the only available long sediment core from the lake (‘SG93’) was extracted from a single bore hole and was therefore interrupted by gaps of unknown duration between successive core sections. In the summer of 2006, a new sediment core (‘SG06’) was recovered from the lake. Four separate boreholes were drilled and the parallel sets of cores recovered were found to overlap completely, without gaps between segments. This new record provides the ability to test existing atmospheric radiocarbon calibration models, as well as to assess the scale of inter-regional leads and lags in palaeoclimatic changes over the last Glacial–Interglacial cycle. Multi-disciplinary analyses from SG06 are still ongoing, but a reliable description of the sedimentary sequence needs to be provided to the wider science community before major outputs from the project are released, thereby allowing fully-informed critical evaluation of all subsequent releases of data based on the SG06 record. In this paper, we report key litho-stratigraphic information concerning the SG06 sediment core, highlighting changes in the clarity of annual laminations (varves) with depth, and possible implications for the mechanism of the climate change. We also discuss the potential of the SG06 record to meet the fundamental goals of the INQUA-INTIMATE project.