Signals of Relative Sea Level perturbations: Defining the divide between signal shredding versus preservation in the stratigraphic record.

相对海平面变化的拖曳影响沿海环境的演变，包括陆地的增长或损失以及三角洲环境下河流格局的变化。相对海平面的变化也影响形成大陆边缘地层学的沉积物的结构。这些沉积沉积物通常含有能量和水储备，可以作为碳捕获和储存的宿主。需要改进解释和预测地层模式的方法，以便(1)管理这些资源和(2)反转古气候记录的地层记录，从而为预测未来地球系统对气候变化的反应提供信息。最近的理论工作表明，在将外部环境信号锁定到地层记录之前，泥沙输送系统中内部产生的过程具有摧毁或“粉碎”外部环境信号的能力。通过实验和现场数据的分析相结合，该团队将确定将其记录在地层学中所需的相对海平面循环的速率和幅度。这项工作将提高从沿海地层数据集恢复有关过去气候变化的有意义数据的能力，并生成海岸对气候变化响应的预测模型。最近的理论工作表明，沉积物传输系统中的自生过程具有在转移到地层记录之前粉碎环境和构造扰动信号的能力。许多人认为相对海平面(RSL)的变化是影响大陆边缘运输系统的最重要的边界条件。然而，我们仍然缺乏定量的理论来解释RSL旋回在地层学中储存的必要属性，从而限制了地层学在确定古环境方面的作用。以前的实验结果表明，幅度小于一个河道深度、周期小于在三角洲顶部沉积一个河道深度所需时间的RSL旋回容易受到信号粉碎的影响。该团队将使用现有的数据集和新的实验室实验来验证这一假设。这项工作产生的定量理论和预测将以密西西比三角洲晚中新世至第四纪的地层学为基准。

The tug of relative sea level change influences the evolution of coastal environments, including land growth or loss and changing river patterns in deltaic settings. Relative sea-level change also influences the architecture of sediments that form continental margin stratigraphy. These sedimentary deposits frequently contain energy and water reserves and can serve as hosts for carbon capture and storage. Improved methods are needed for interpreting and predicting stratigraphic patterns in order to (i) manage these resources and (ii) invert the stratigraphic record for paleo-climatic records, which could inform predictions of future Earth system response to climate change. Recent theoretical work suggests that internally generated processes in sediment transport systems have the capacity to destroy, or "shred", external environmental signals prior to locking them into the stratigraphic record. Through a combination of experiments and analysis of field data, the team will determine the necessary rates and magnitudes of relative sea level cycles for them to be recorded in stratigraphy. This work will advance the ability to recover meaningful data about past climate change from coastal stratigraphic datasets and generate predictive models for coastal response to climate change.Recent theoretical work suggests that autogenic processes in sediment transport systems have the capacity to shred signals of environmental and tectonic perturbations prior to transfer to the stratigraphic record. Many argue that changes in Relative Sea Level (RSL) represent the most important boundary condition affecting continental margin transport systems. However, we still lack quantitative theory to explain the necessary properties of RSL cycles in order to store them in stratigraphy, thus limiting the usefulness of stratigraphy for defining paleo-environments. Results from previous experiments suggest that RSL cycles with amplitudes less than one channel depth, and of periodicities less than the amount of time necessary to deposit one channel depth of stratigraphy over a delta-top, are susceptible to signal shredding. The team will test this hypothesis using existing data sets and new laboratory experiments. Quantitative theory and predictions produced from this work will be benchmarked against stratigraphy from the Late Miocene to Quaternary stratigraphy of the Mississippi Delta.