Uncharted offshore archives – organic geochemical imprints on the Algarve shelf

未知的近海档案——阿尔加维大陆架上的有机地球化学印记

• 批准号: 498354030
• 负责人: Professor Dr. Klaus Reicherter
• 金额: --
• 依托单位: Lehrstuhl für Organische Biogeochemie in Geo-Systemen (OBG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/498354030?language=en
• 关键词: Uncharted; offshore; archives; organic; geochemical

The earth’s vast offshore areas and their Holocene sedimentary records are a largely uncharted domain. For paleoenvironmental and extreme wave events research in particular, the investigation of untouched and long-term offshore archives might be of favor but is underrepresented in science. Prior and preliminary offshore results indicate that the identification and environmental impact of backwashed terrestrial material exceeding the continuous fluvial background in marine settings, presents distinct events signatures. Accordingly, the following working hypotheses are derived: (1) Tsunamis cause a singular and a highly energetic quantitative and qualitative mobilization of terrestrial material and associated organic matter, generating singular superimposed event deposits in offshore systems; (2) Offshore depositional archives represent favorable environments for tracing the tsunami backwash-driven superimposed terrestrial discharge.During the RV METEOR cruise M152 an extensive sample set of sediment cores from the Algarve shelf was collected with the premise to examine the paleoenvironmental evolution of the Algarve shelf and differentiate and characterize contrasting discontinuous layers of the AD 1755 Lisbon tsunami and other preceding short-term high-energy events. To achieve this, the project investigates the obtained offshore samples with a comprehensive organic geochemical approach supported by complementary sedimentological and micropaleontological data.The projects work packages include (a) the identification of the full organic geochemical compound spectrum and the selection of suitable environment-sensitive organic geochemical proxies that reflect and can differentiate long-term but also short-term environmental changes; (b) the geochemical reconstruction of the environmental evolution on the Algarve shelf and differentiation between long-term processes and short-term events affecting the shelf; (c) the identification of the AD 1755 Lisbon tsunami and potential preceding event deposit with the defined organic markers; (d) the comparison between gained offshore geochemical characteristics with their terrestrial counterparts; and lastly (e) the determination of the spatial distribution of event deposits and examination of backwash mechanisms through organic-geochemical insights.In achieving these project’s goals and gathering new information we aim to not only encounter novel discoveries to reassess the tsunami hazard for the European Atlantic coastline but also understand fundamental basics of hydrodynamic processes of tsunami backwash. By this, future tsunami research will profit substantially from an authentic offshore dataset in order to produce tsunami hazard maps and scenarios for an improved hazard and mitigation management from local authorities.

地球广阔的近海地区及其全新世沉积记录是一个未知的领域。特别是对于古环境和极端波浪事件研究，未触及和长期海上档案的投资可能是青睐的，但在科学方面的投资不足。先前和初步的海上结果表明，在海洋环境中，反冲洗的陆地材料的识别和环境影响超过了河流环境的连续河流背景，提出了不同的事件特征。彼此之间，得出了以下工作假设：（1）海啸引起陆地物质和相关有机物的奇异和高能的定量和定性动员，从而在近海系统中产生奇异的叠加事件矿床； （2）离岸沉积档案代表着有利的环境，用于追踪海啸反向冲洗驱动的叠加陆地排放。在RV Meteor Cruise M152 M152中，从Algarve架子中收集了一套广泛的沉积物核心样本，并在前提中收集了较高的层次5，以检查层次5的层次和不同的脉冲范围，并表征了不同的散发液位，并表征了不同的疾病，并表征了不同里斯本海啸和其他早期高能事件。为了实现这一目标，该项目通过完整的沉积学和微石材生产数据来调查获得的近海样品。项目的工作包包括（a）识别完整的有机地球化学化合物谱系的识别，以及适合环境敏感的有机地球化学的选择，可以反映和反射性的长期变化，但也可以区分短期的变化，也可以区分短期的变化； （b）环境进化的地球化学重建以及长期过程和影响货架的短期事件之间的区分； （c）鉴定AD 1755里斯本海啸和用定义的有机标记物的潜在事件沉积物； （d）获得的离岸地球化学特征与其陆地对应物之间的比较； and lastly (e) the determination of the spatial distribution of event deposits and examination of backwash mechanisms through organic-geochemical insights.In achieving these project’s goals and gathering new information we aim to not only encounter novel discoveries to reassess the tsunami hazard for the European Atlantic Coastline but also understand fundamental basics of hydrodynamic processes of tsunami backwash.这样，未来的海啸研究将从真实的离岸数据集中获得大量利润，以生成海啸危害地图和方案，以改善地方当局的危害和缓解管理。