Novel luminescence diagnosis of storm deposition across intertidal environments.
Novel luminescence diagnosis of storm deposition across intertidal environments.
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DOI：
10.1016/j.scitotenv.2023.161461
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
N. Pannozzo;R. Smedley;A. Plater;I. Carnacina;N. Leonardi
中科院分区：
文献类型：
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作者：
N. Pannozzo;R. Smedley;A. Plater;I. Carnacina;N. Leonardi
盐沼提供了宝贵的自然基础，低成本的防御措施，防止沿海洪水和侵蚀。风暴沉积可以提高盐沼对海平面加速上升的适应能力，海平面上升对全世界盐沼的生存构成威胁。因此，重要的是要能够准确地检测风暴活动的频率在长期的沉积物记录，以量化风暴如何有助于盐沼复原力。发光能够推断矿物颗粒在埋葬之前暴露在阳光下的时间（例如，存在或不存在沉积物处理）。这项研究使用了从英格兰西北部里布尔河口收集的沉积物岩心，以表明沙子大小的钾长石颗粒的发光特性可以诊断潮间带沉积的差异模式（即，沙滩、泥滩和盐沼）的长期沉积物记录，通过检测不同环境之间沉积物漂白潜力的变化（即，沉积物暴露于阳光），从而建立了解释潮间沉积物发光特性的框架。然后，它使用了在风暴事件前后收集的现代沉积物样本，以显示这些属性如何诊断沉积物处理的变化（即，尽管地球化学和粒度分布分析没有记录到沉积物成分的变化，但风暴活动造成的泥滩沉积物的漂白潜力。这种新的发光方法可以应用于长期沉积物记录，以揭示（和日期）的沉积和/或沉积动力学的环境中的变化，没有明显的地层证据。
Salt marshes provide valuable nature-based, low-cost defences protecting against coastal flooding and erosion. Storm sedimentation can improve the resilience of salt marshes to accelerating rates of sea-level rise, which poses a threat to salt marsh survival worldwide. It is therefore important to be able to accurately detect the frequency of storm activity in longer-term sediment records to quantify how storms contribute to salt marsh resilience. Luminescence is able to infer how long mineral grains were exposed to sunlight prior to burial (e.g., the presence or absence of sediment processing). This study used sediment cores collected from the Ribble Estuary, North West England, to show that luminescence properties of sand-sized K-feldspar grains can diagnose the differential modes of deposition across intertidal settings (i.e., sandflat, mudflat and salt marsh) in longer-term sediment records by detecting the variability in sediment bleaching potential between settings (i.e., sediment exposure to sunlight), thus establishing a framework for the interpretation of luminescence properties of intertidal sediments. It then used modern sediment samples collected before and after a storm event to show how such properties can diagnose changes in sediment processing (i.e., bleaching potential) of mudflat sediments caused by storm activity, despite no changes in sediment composition being recorded by geochemical and particle size distribution analyses. This new luminescence approach can be applied to longer-term sediment records to reveal (and date) changes in the environment of deposition and/or depositional dynamics where there is no obvious stratigraphic evidence of such.