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

拟议的综合项目的目的是量化南极冰盖的历史，过去10马。利用新的统计工具，我们将分离和量化南极深海漂流沉积物中细粒级粒度分布数据中的“冰因子”。在我们的准备工作中，我们表明，沉积南极漂流体是连续的冰档案，其在大陆隆起处的建造历史与冰向大陆架断裂的进展有直接联系。因此，冰量的量化是可能的，因为相对的冰盖体积比是已知的模型。在一个四步的方法，我们将完成现有的样本收集站点1095，提高其时间分辨率和分析恢复的数据集与端元建模方法。第二步是通过在附近的漂移中纳入对照站点（站点1101）的样本，验证区域规模的本地数据集。第三，我们将准备和分析样品从东南极漂移（站点1165）深入东西冰盖的历史比较。在项目的综合阶段，新的近端数据集将与我们的合作伙伴提供的新的全球同位素-钙/镁基冰量记录相关联。这是现在开始拟议研究的三个重要原因：预期数据的高社会相关性，由于两个ODP腿的一年ODP暂停已经过去，可以免费获得样品，并且可以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...