Effect of lateral advection on sedimentary climate archives - high-resolution records from the last Deglacial to Holocene North Atlantic drift deposits

该项目将利用沉积学数据和来自粘土矿物学、微古生物学和有机地球化学的补充信息，对北大西洋980(费尼漂移)和984(比约恩漂移)的脱冰期-全新世漂移沉积物进行综合的、多参数的千年尺度记录。作为中心问题的沉积物颗粒大小将提供有关过去20,000年来当前强度变化的详细信息，在从记录中过滤掉冰筏偏差后。粘土矿物组合将确定细粒物质的潜在来源区域。球石组合的组成指示了地表水文和生产力的变化以及重新分布的前第四纪物种的供应。有机碳和同位素研究将揭示碳酸盐和有机物质的组成和放射性碳年龄之间可能存在的偏置，这些碳酸盐和有机物质在细小部分中与整体沉积物的性质有关。各分支学科的整合将显示水流作用下的侧向泥沙移位对古气候记录解释的不同影响。

This project will elaborate an integrated, multi-parameter millennial-scale record of Deglacial-Holocene drift sediments in the North Atlantic at ODP Sites 980 (Feni Drift) and 984 (Björn Drift) using sedimentological data and supplementary information from clay mineralogy, micropaleontology, and organic geochemistry. Sediment grain-sizes as the central issue will provide detailed information on the current strength variability over the past 20,000 years, after ice-rafted bias is filtered from the record. The clay mineral assemblage will identify potential source areas for fine-grained material. The composition of the coccolith assemblage gives indications for changes of surface hydrology and productivity and supply of re-distributed pre-Quaternary species. Organic carbon and isotopic studies will reveal possible offset between composition and radiocarbon ages of carbonate and organic matter in the fine fraction relative to properties of the bulk sediment. The integration of the sub-disciplines will demonstrate the variable impact of lateral sediment displacement by current action on the interpretation of palaeoclimatic records.