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首页> 外文期刊>Paleoceanography >A Novel Approach Using Time-Depth Distortions to Assess Multicentennial Variability in Deep-Sea Oxygen Deficiency in the Eastern Mediterranean Sea During Sapropel S5
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A Novel Approach Using Time-Depth Distortions to Assess Multicentennial Variability in Deep-Sea Oxygen Deficiency in the Eastern Mediterranean Sea During Sapropel S5

机译：一种新的方法，使用时间深度扭曲来评估Sapropel S5期间东部地中海深海氧气缺氧的多期一年变异性

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摘要

Reconstructing millennial-to centennial-scale climate variability for the Eemian-an interval with estimated sea surface temperatures ~0.5 °C warmer than "preindustrial"-requires records with high temporal resolution. Sapropel S5 sediments, deposited under anoxic conditions in the Eastern Mediterranean Sea, offer the rare opportunity to assess multicentennial climate variability during this time. Here we present high-resolution S5 piston core data from the Nile delta region. Specifically, we focus on Ba/Ti, Br/Ti, and Mo/Ti, as they are proxies for paleo-productivity, marine organic carbon, and sediment anoxia, respectively. A high correlation between our Ba/Ti values in core 64PE-406-E1 and well-dated Ba records of nearby cores (LC21 and ODP967) was found. We, therefore, tuned our data to these cores obtaining an initial age model. A time-frequency analyses indicated significant frequency content in the multicentennial band, although the frequency components drifted over time. Assuming spectral simplicity, we corrected for sedimentation rate changes on a multicentennial time scale. This novel approach grants a higher-resolution age model. The resulting variability in sedimentation rate is similar to records of monsoon variability, indicating a possible link between sedimentation at the core location and low-latitude monsoon variability, linked via the River Nile. Moreover, the periodicities found in the sapropel time series are similar to the frequency content of total solar irradiance and sunspot records known for the Holocene, at least at high frequencies (~50-150 years). Hence, our data suggest cyclic intrasapropel variability, at least during the deposition of sapropel S5, may be linked to solar cycles.
机译：重建千禧一年至百年气候变化，为EMIAN - 一个间隔，估计的海面温度约为0.5°C比“预生产” - 具有高时间分辨率的记录。 SAPROPEL S5沉积物，沉积在地中海东部的缺氧条件下，提供了难得在此期间评估多年度气候变异的机会。在这里，我们呈现来自尼罗河三角洲区域的高分辨率S5活塞核心数据。具体而言，我们专注于BA / TI，BR / TI和MO / TI，因为它们分别是古生产率，海洋有机碳和泥沙缺氧的代理。找到了核心64PE-406-E1中的BA / TI值与附近核心富裕的BA记录（LC21和ODP967）之间的高相关性。因此，我们将数据调整为这些核心获得初始年龄模型。尽管频率分量随时间播放，但是时间频率分析在多期一年形带中指示了显着的频率内容。假设光谱简单性，我们校正了多期一年时间尺度的沉降率变化。这部新颖方法授予更高分辨率的年龄模型。由此产生的沉降率的变异性类似于季风变异性的记录，表明通过河尼罗河连接核心位置和低纬度季风变异性之间的沉降之间的可能链接。此外，SAPRopel时间序列中发现的周期性类似于全新世（〜50-150岁）的全新世（〜50-150岁）中已知的总太阳能辐照度和太阳黑子记录的频率内容。因此，我们的数据建议至少在Sapropel S5的沉积期间的循环血液疏松变异性，可以与太阳循环相关联。

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  • 来源
    《Paleoceanography》 |2019年第5期|共13页
  • 作者

    Jan Pieter Dirksen; Rick Hennekam; Gert-Jan Reichart; Esmee Geerken;

  • 作者单位

    Department of Earth Sciences Faculty of Geosciences Utrecht University Utrecht The Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Ocean Systems and Utrecht University Texel The Netherlands;

    Department of Earth Sciences Faculty of Geosciences Utrecht University Utrecht The Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Ocean Systems and Utrecht University Texel The Netherlands;

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

    A Novel; Approach Using; Time-Depth Distortions;

    机译：一种小说;使用;时间深度扭曲;

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