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首页> 外文期刊>Estuarine Coastal and Shelf Science >Decadal- to centennial-scale variability of sedimentary biogeochemical parameters in Kagoshima Bay, Japan, associated with climate and watershed changes
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Decadal- to centennial-scale variability of sedimentary biogeochemical parameters in Kagoshima Bay, Japan, associated with climate and watershed changes

机译：日本鹿儿岛湾沉积生物地球化学参数的年代际到百年尺度变化，与气候和流域变化有关

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摘要

In order to detect responses of primary productivity in Japanese coastal embayments to climate and watershed changes for the last 500 years, we unraveled sedimentary records of δ~(13)C, δ~(15)N, TOC, TN, and C/N ratio in the north basin of Kagoshima Bay (KB). Based on principal component analysis of these geochemical data, primary component (PC) 1 that explains 65% of the total variance within all the geochemical parameters was identified. The records of δ~(13)C, δ~(15)N, TOC, and TN having high loadings on the PCI axis showed centennial-scale variations (low levels during AD 1595—1725 and high levels during AD 1725—1860) and a shift (AD 1725). A comparison between our records and previous studies on the biogeochemical processes suggests that the factor responsible for fluctuations in δ~(13)C, δ~(15)N, TOC, and TN is likely to be the changes in primary productivity in the north basin of KB rather than other factors. C/N values, which have high loadings on PC2, are possibly related to input of C_3 land plants to the north basin of KB, suggesting changes in the surrounding forest environments. The centennial-scale decrease in primary productivity that is represented by the TOC record is coincident with a temperature decrease associated with the Little Ice Age, suggesting that the primary productivity in the north basin of KB might have been influenced by global or Northern Hemispheric-scale climate changes.
机译：为了检测近500年日本沿海沿岸初级生产力对气候和流域变化的响应，我们对δ〜（13）C，δ〜（15）N，TOC，TN和C / N的沉积记录进行了整理。鹿儿岛湾北部盆地的比例（KB）。根据对这些地球化学数据的主成分分析，确定了解释所有地球化学参数内总方差的65％的主要成分（PC）1。在PCI轴上具有高载荷的δ〜（13）C，δ〜（15）N，TOC和TN的记录显示了百年尺度的变化（公元1595-1725年低水平，公元1725-1860年高水平）和一个转变（公元1725年）。我们的记录与以前的生物地球化学过程研究之间的比较表明，造成δ〜（13）C，δ〜（15）N，TOC和TN波动的因素可能是北方初级生产力的变化。盆地面积而不是其他因素。 C / N值在PC2上具有很高的负荷，可能与向KB北部盆地输入C_3陆地植物有关，表明周围森林环境发生了变化。 TOC记录所代表的初级生产力的百年尺度下降与小冰期相关的温度下降相吻合，这表明KB北部盆地的初级生产力可能受到了全球或北半球尺度的影响气候变化。

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