Quantitative Reconstruction of the Neogene East and West Antarctic Ice Sheet History from Drift Sediments (ODP Leg 178 and Leg 188): A Synthesis

拟议的合成项目旨在量化过去10 Ma的南极冰盖历史。利用新的统计工具，我们将从南极深海漂流沉积物的细小粒度分布数据中分离和量化“冰因素”。在我们的准备工作中，我们表明，南极沉积漂移体是连续的冰档案，在它们在大陆隆起时的形成历史中与冰向陆架破裂的推进有直接联系。因此，冰量的量化是可能的，因为相对冰盖与体积的比率是从模型中得知的。在四步法中，我们将完成1095站点的现有样本收集，提高其时间分辨率，并使用端元建模方法对恢复的数据集进行分析。第二步是通过合并附近漂移上的控制点(1101点)的样本，将本地数据集验证到区域尺度。第三，我们将准备和分析南极东部漂移(1165站)的样品，以进行东西向冰盖历史的深入比较。在项目的合成阶段，新的近端数据集将与我们的合作伙伴提供的基于钙/镁的新的全球同位素冰量记录相关联。这是现在开始这项拟议研究的三个重要原因：预期数据的高度社会相关性……，由于两个ODP站的一年消耗臭氧层物质暂停令已经过去，可以免费获取样本，以及从其他工作组获得丰富的辅助数据……

The proposed synthesis project aims to quantify the Antarctic ice sheet history of the last 10 Ma. With new statistical tools we will isolate and quantify the "ice factor" in fine-fraction grain-size distribution data from Antarctic deep-sea drift deposits. In our preparatory work we showed that the sedimentary Antarctic drift bodies are continuous ice archives with a direct link in their built-up history at the continental rise to ice advances to the shelf break. Quantification of the ice volume is therefore possible, since the relative ice-cover to - volume ratio is known from models. In a four step approach we will complete the existing sample collection of Site 1095, increase its time resolution and analyse the recovered data sets with the end-member modeling method. Second step is the validation of the local data set to a regional scale by incorporating samples of a control Site (Site 1101) on a nearby drift. Thirdly we will prepare and analyse samples from a E-Antarctic drift (Site 1165) for a in-depth E-W ice sheet history comparision. During the synthesis phase of the project the new proximal data set will be correlated to a new global isotope -Ca/Mg based ice volume record contributed by our cooperation partners. These are three important reasons to start with the proposed research now: High social relevance of the expected data..., free access to the samples since the one year ODP moratorium for both ODP legs has passed, and the availability of abundant ancillary data from other working groups...