REU: Paleocirculation of the Deep North Atlantic

REU：北大西洋深处的古环流

• 批准号: 8900281
• 负责人: William Showers
• 金额: $ 8.87万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-05-15 至 1992-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8900281&HistoricalAwards=false
• 关键词: REU; Paleocirculation; Deep; North; Atlantic

The study will examine high resolution, rapid sedimentation rate record of contourites along western margin of North Atlantic in order to decipher the changes in the rate of formation of North Atlantic deep water (NADW) and the intensity of western boundary undercurrent (WBUC) during the Pleistocene. Blake Outer Ridge (BOR), which is the largest contourite drift in western North Atlantic and extends form 2000 to 4900 m depth, is the target study area. Its ridge crest contains an amplified high resolution signal of WBUC. Previously funded pilot study on WBUC was completed and the presence of a high resolution record in BOR cores was identified. Funding is provided to expand on the pilot study through stable-isotopic and sedimentological analyses of core tops and 3 piston cores and 9 box cores planned to be retrieved during an REU cruise on BOR. A comparison of the core data with sediment structures, seafloor photos and hydrographic maps, as well as seismic echo character will yield new information about the factors influencing physical properties of sediments. When completed the study open line of paleocurrent investigations in paleoceanography.

这项研究将检查高分辨率，快速沉积 北陆西缘沿着等深流岩速率记录 为了破译大西洋中 北大西洋深水（NADW）的形成及其强度 西部边界暗流（WBUC）在更新世。 布莱克外脊（BOR），这是最大的等深岩漂移 在北大西洋西部，从2000米延伸到4900米 深度，是研究的目标。 它的山脊包含一个 放大的WBUC高分辨率信号。 以前供资 WBUC的试点研究已经完成， 识别了BOR岩心中的分辨率记录。 资金 提供了通过稳定同位素扩展试点研究 岩心顶部和3个活塞岩心的沉积学分析 和9个盒式岩芯，计划在REU巡航期间回收， 无聊。 岩芯数据与沉积物结构的比较， 海底照片和水文地图，以及地震回波 字符将产生有关因子的新信息 影响沉积物的物理性质。 建成后 该研究为中国古水流研究开辟了新途径 古海洋学