Models of the 3-D Stratigraphy of Glaciated Continental Shelves

冰川大陆架 3-D 地层模型

• 批准号: 9526930
• 负责人: Yang Shen
• 金额: $ 8万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-07-01 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526930&HistoricalAwards=false
• 关键词: Models; Stratigraphy; Glaciated; Continental; Shelves

Shen, Holbrook, and ten Brink OPP 9526930 Abstract The interpretation of the stratigraphy of the glaciated continental shelves and the reconstruction of past ice sheet fluctuations from the stratigraphy require understanding of the relationships among the stratal geometry, glacial and marine sedimentary processes, and ice dynamics. Previous work investigated the formation of the morphology and the broad stratal geometry of the Antarctic continental shelf with 2-D structure-imitating models. Several generalizations were proposed regarding processes that form the glaciated Antarctic shelves and several guidelines were proposed for the interpretation of stratigraphic features. This award supports work to expand the modeling efforts in three new directions: 1). constructing 3-D models to account for the differences in glacial morphology and stratigraphy between cross- shelf troughs and banks; 2). improving the structure-imitating models and developing process-based models. We will treat ice advance and retreat as continuous, autoregressive processes instead of discrete steps in our previous models. In the process- based models, erosion and deposition will be determined by the velocity of basal ice or the basal shear stress. Glacial erosion and deposition will be coupled with models of aqueous sedimentary processes. 3). making detailed comparison to newly compiled data sets from the Antarctic and the SE Greenland shelves, and in doing so improving our understanding of the stratigraphy of the glaciated continental shelf. This work is important to understanding the past behavior of ice sheets in both the northern and southern polar regions.

Shen，Holbrook，and ten Brink 摘要 冰川大陆架地层学的解释和过去冰盖波动的重建需要了解地层几何学，冰川和海洋沉积过程，冰动力学之间的关系。 以前的工作调查的形成的形态和广泛的地层几何学的南极大陆架的2-D结构模仿模型。 对形成南极冰架的过程提出了若干概括，并为解释地层特征提出了若干准则。 该奖项支持在三个新方向上扩展建模工作： 1）。构建3D模型来解释差异 在冰川形态和地层之间的交叉- 陆棚槽和浅滩; 2）.改进结构模拟模型， 基于过程的模型。 我们将提前处理冰， 相反，作为连续的自我回归过程， 我们之前的模型中的离散步骤。 在这个过程中- 基于模型，侵蚀和沉积将被确定 由底部冰的速度或底部剪应力决定。 冰川侵蚀和沉积将与 水沉积过程的模型。 3）。与新编制的数据集进行详细比较 从南极和格陵兰东南部大陆架， 这样做可以提高我们对地层学的理解 冰川大陆架的边缘 这项工作对于了解北方和南极地区冰盖过去的行为都很重要。