Millennial scale deep circulation changes in the North Atlantic during the Plio-Pleistocene inferred from high resolution records of chemical- and physical sediment properties

根据化学和物理沉积物特性的高分辨率记录推断上皮里奥-更新世期间北大西洋千年尺度的深层环流变化

• 批准号: 13166336
• 负责人: Professor Dr. Gerold Wefer
• 金额: --
• 依托单位: Zentrum für Marine Umweltwissenschaften (MARUM)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/13166336?language=en
• 关键词: Millennial; scale; deep; circulation; changes

IODP Expeditions 303 (Fall 2004) and 306 (March-April, 2005; Participant Dr. Jens Grützner) focus on rapid changes in North Atlantic climate history during the late Neogene-Quaternary. Non-destructive X-ray fluorescence (XRF) core scanning is an advanced high-resolution method to help investigating several major research targets outlined in the drilling proposal. We here propose to perform XRF scans of element intensities (K, Ca, Fe, Ti, Al, Si, Ba) on selected 303/306 drilling locations to derive cm-resolution records of terrigenous and biogenic sediment composition. Combined with detailed age models these records will to characterize prominent millennial scale climate cycles of the last glacial period known as Dansgaard/Oeschger and Heinrich events and help to study their possible occurrence in time intervals prior to 100 ka BP. By using a depth transect approach we also intend to infer changes in the deep and intermediate water flow associated with these climate cycles. Furthermore elemental ratios (e.g. Al/Ti, Ba/Ti) will be used to explore millennial changes in terrigenous provenance and biogenic productivity. The research proposed here provides an ideal complement to our ongoing work on OOP Leg 172 Sites (subtropical North Atlantic) and by comparing results from both projects we intend to investigate latitudinal climate linkages in the North Atlantic.

国际气候发展计划第303次（2004年秋季）和第306次（2005年3 - 4月，参与者Jens grtzner博士）主要研究北大西洋新第三纪晚期—第四纪气候的快速变化。非破坏性x射线荧光（XRF）岩心扫描是一种先进的高分辨率方法，可以帮助研究钻井方案中概述的几个主要研究目标。在这里，我们建议在选定的303/306钻孔位置进行元素强度（K, Ca, Fe, Ti, Al, Si, Ba）的XRF扫描，以获得陆源和生物沉积物组成的厘米分辨率记录。结合详细的年龄模型，这些记录将描述末次冰期突出的千年尺度气候循环，即Dansgaard/Oeschger和Heinrich事件，并有助于研究它们在100 ka BP之前的时间间隔内可能发生的情况。通过使用深度样带方法，我们还打算推断与这些气候循环相关的深层和中层水流的变化。此外，元素比值（如Al/Ti， Ba/Ti）将用于探索陆源物源和生物生产力的千年变化。这里提出的研究为我们正在进行的OOP第172站（亚热带北大西洋）的工作提供了理想的补充，通过比较两个项目的结果，我们打算调查北大西洋的纬度气候联系。