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首页> 外文期刊>Journal of Asian earth sciences >Evaluating color reflectance spectral methods for estimating biogenic contents of South China Sea sediments
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Evaluating color reflectance spectral methods for estimating biogenic contents of South China Sea sediments

机译：评价颜色反射光谱法估算南海沉积物生物含量

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摘要

The biogenic contents of marine sediment cores are useful proxies for revealing past oceanic and climatic variability. Color reflectance spectral methods provide a rapid and non-destructive avenue for acquiring high-resolution biogenic content data from the split surfaces of marine sediment cores. This study presents new results on the applications of color reflectance methods for determining the biogenic contents of sediment cores retrieved from the South China Sea (SCS), a dynamic setting that receives biogenic components such as carbonate, total organic carbon (TOC), and opal from the sea, and terrestrial sediments transported by the Pearl River and Kao-Ping River from the north, and the Sunda Shelf from the south. Our study found that the color reflectance methods that are based on a regionally limited calibration provide more optimal estimates of the biogenic content of marine cores from the SCS than do basin-scale calibration methods. Though the regional calibrations appear to be successful, our analyses indicate the complexity of applying color reflectance methods in marine sediment core studies. We also performed a controlled experiment that was designed to quantitatively test how the carbonate content increased the influence of color reflectance changes, using outcropped, Pleistocene-aged sediment samples taken from the "Moon World (MW)" in southwestern Taiwan as control data. The results of this experiment suggest that the regression equations for estimating CaCO_3 content based on core data are not solely driven by input variables responding directly to CaCO_3 content changes, and that the composition of terrestrial sediment inputs into the SCS are complicated both spatially and temporally. Our studies also suggest that a better understanding of the compositional changes of terrestrial sediment inputs into the SCS will be required to minimize the uncertainties of biogenic content estimations by color reflectance methods.
机译：海洋沉积物核心的生物成因含量是揭示过去海洋和气候变化的有用代理。彩色反射光谱法提供了一种快速，无损的途径，可以从海洋沉积物芯的裂开表面获取高分辨率的生物含量数据。这项研究提供了有关颜色反射法在确定从南海（SCS）取回的沉积物核的生物成因中的应用的新结果，该动态环境接收碳酸盐，总有机碳（TOC）和蛋白石等生物成因北部是由珠海和高平河运来的陆地沉积物，南部是由苏打架运来的陆地沉积物。我们的研究发现，基于区域有限校准的颜色反射方法比盆地规模的校准方法能够更有效地估算南海地区海心生物含量。尽管区域校准似乎是成功的，但我们的分析表明在海洋沉积物岩心研究中应用颜色反射法的复杂性。我们还进行了一项对照实验，该实验旨在定量分析碳酸盐含量如何增加颜色反射率变化的影响，并使用了台湾西南部“月亮世界（MW）”中出露的，更新世年龄的沉积物样本作为对照数据。该实验的结果表明，基于核心数据估算CaCO_3含量的回归方程并不仅由直接响应CaCO_3含量变化的输入变量驱动，而且向SCS输入的地面沉积物的组成在空间和时间上都很复杂。我们的研究还表明，需要更好地了解向SCS输入的地面沉积物的成分变化，以最大程度地减少通过颜色反射法估算生物含量的不确定性。

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