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首页> 外文期刊>Estuarine Coastal and Shelf Science >Variability of organic δ~(13)C and C/N in the Mersey Estuary, U.K. and its implications for sea-level reconstruction studies
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Variability of organic δ~(13)C and C/N in the Mersey Estuary, U.K. and its implications for sea-level reconstruction studies

机译：英国默西河口有机δ〜（13）C和C / N的变化及其对海平面重建研究的影响

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摘要

Microfossil analysis (e.g. diatoms, foraminifera and pollen) represents the cornerstone of Holocene relative sea-level (RSL) reconstruction because their distribution in the contemporary inter-tidal zone is principally controlled by ground elevation within the tidal frame. A combination of poor microfossil preservation and a limited range in the sediment record may severely restrict the accuracy of resulting RSL reconstructions. Organic δ~(13)C and C/N analysis of inter-tidal sediments have shown some potential as coastal palaeoenvironmental proxies. Here we assess their viability for reconstructing RSL change by examining patterns of organic δ~(13)C and C/N values in a modern estuarine environment. δ~(13)C and C/N analysis of bulk organic inter-tidal sediments and vegetation, as well as suspended and bedload organic sediments of the Mersey Estuary, U.K., demonstrate that the two main sources of organic carbon to surface saltmarsh sediments (terrestrial vegetation and tidal-derived particulate organic matter) have distinctive δ~(13)C and C/N signatures. The resulting relationship between ground elevation within the tidal frame and surface sediment δ~(13)C and C/N is unaffected by decompositional changes. The potential of this technique for RSL reconstruction is demonstrated by the analysis of part of an early Holocene sediment core from the Mersey Estuary. Organic δ~(13)C and C/N analysis is less time consuming than microfossil analysis and is likely to provide continuous records of RSL change.
机译：微化石分析（例如硅藻，有孔虫和花粉）代表了全新世相对海平面（RSL）重建的基石，因为它们在当代潮间带的分布主要受潮汐框架内地面高度的控制。微化石保存不佳和沉积物记录范围有限的结合可能会严重限制所得RSL重建的准确性。潮间带沉积物的有机δ〜（13）C和C / N分析显示出作为沿海古环境代理的潜力。在这里，我们通过检查现代河口环境中有机δ〜（13）C和C / N值的模式来评估它们重建RSL变化的可行性。英国默西河口大量潮间有机物沉积和植被以及悬浮和基床有机沉积物的δ〜（13）C和C / N分析表明，表层盐沼沉积物的两个主要有机碳来源（陆地植被和潮汐来源的颗粒有机物具有独特的δ〜（13）C和C / N特征。潮汐框架内地面高程与地表沉积物δ〜（13）C和C / N之间的关系不受分解变化的影响。通过分析默西河口早期全新世沉积岩芯的一部分，证明了该技术在RSL重建中的潜力。有机δ〜（13）C和C / N分析比微化石分析耗时少，并且可能提供RSL变化的连续记录。

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