Compound-specific radiocarbon dating - approaching the problems of dating Antarctic sediments

在拟议的项目中，我们希望继续对南极沉积物进行化合物特定放射性碳分析（CSRA）的研究，这是目前在科隆大学建立和扩展的一种方法。我们的目标是将CSRA的应用范围从硅藻甾醇的定年扩展到其他生物标志物（例如，特定的脂肪酸，醇，藿烷，色素），这些生物标志物具有不同生物群体的特征，如硅藻以外的藻类（例如，Phaeophyceae），植物/浮游动物，陆生植物和细菌，并将我们的CRSA概念应用于南极洲的其他档案和地区。在拟议的项目中将完成两个个案研究：第一个将集中于南乔治亚海岸海洋记录的水库效应的量化，第二个将处理东南极洲海洋记录的MIS 3年龄的验证。我们的目标是改进基于放射性碳的沉积物年表，并建立CSRA作为一种广泛适用的方法来获得高质量的年龄模型。

With the proposed project we want to continue the research on compound specific radiocarbon analysis (CSRA) on Antarctic sediments, a method which is currently established and expanded at the University of Cologne. Our objectives are to extend the application of CSRA from dating diatom sterols to other biomarkers (e.g., specific fatty acids, alcohols, hopanes, pigments) characteristic for different groups of organisms like algae other than diatoms (e.g., Phaeophyceae), phyto/zooplankton, terrestrial plants and bacteria and to apply our concept of CRSA on other archives and regions of Antarctica. In the proposed project two case studies will be accomplished: the first one will focus on the quantification of reservoir effects in a coastal marine record from South Georgia, the second one will deal with the validation of MIS 3 age of a marine record from East Antarctica. Our aim is to improve radiocarbon-based sediment chronologies and to establish CSRA as a broadly applicable method to obtain high-quality age models.