CAREER: Probing the connections between mantle convection and oceanic gateways in the North Atlantic using deep-sea drilling

职业：利用深海钻探探索地幔对流与北大西洋海洋门户之间的联系

• 批准号: 2238290
• 负责人: Ross Parnell-Turner
• 金额: $ 95.27万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2028-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2238290&HistoricalAwards=false
• 关键词: CAREER; Probing; connections; between; mantle

Hot mantle material rises up beneath Iceland from deep within Earth’s interior forming a giant plume that pulses on timescales of millions of years. Plume pulsing contributes to changes in the height of oceanic gateways that link Greenland, Iceland, and Scotland. These gateways control the amount of cold, deep water that has flowed from the Norwegian Sea to the Atlantic ocean over the past few million years. This project will examine the history of plume activity and ocean circulation in the North Atlantic region using data from rock cores collected deep beneath the seabed. The outcomes of this project will have immediate impact upon our knowledge of past ocean circulation and climate, which is key to addressing the environmental challenges that society is confronting today. Broader impacts include participation in workshops for local teachers, delivery of K-12 activities, development of a first year Earth systems class, and support for a post-doctoral scholar and graduate students.The flanks of Reykjanes Ridge south of Iceland lie above one of Earth’s largest plume-ridge systems, and are covered by rapidly accumulating contourite drift sediments that are sensitive to the oceanographic conditions influenced by adjacent deep-water gateways. This configuration provides an ideal natural laboratory to test hypotheses about the interactions between mantle dynamics, paleoceanography, and climate. This project will investigate the extent to which the Iceland mantle plume has controlled oceanic gateways and deep-water circulation in the North Atlantic Ocean during Cenozoic times. Samples and data collected at sites on Björn and Gardar contourite drifts during International Ocean Discovery Program Expedition 395 provide an opportunity to significantly advance our understanding of the history of sedimentation patterns and ocean circulation across the North Atlantic region. Kinematic and paleobathymetric models for ocean basin evolution will be integrated with sediment accumulation rate and current speed estimates from recently drilled cores, as tools to decipher past ocean circulation patterns. Considered together, the proposed models and observations will provide insights into the coupled nature of Earth’s interior, ocean, and surface domains.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

炽热的地幔物质从地球内部深处上升到冰岛下方，形成一个巨大的羽流，其脉动时间尺度为数百万年，导致连接格陵兰岛、冰岛和苏格兰的海洋门户的高度发生变化。这些门户控制着数量。该项目将利用收集到的岩芯数据来研究过去几百万年从挪威海流向大西洋的寒冷深水的历史。该项目的成果将对我们对过去海洋环流和气候的了解产生直接影响，这是解决当今社会面临的环境挑战的关键，包括参加当地教师的研讨会、提供K-12 活动、一年级地球系统课程的开发以及对博士后学者和研究生的支持。冰岛南部雷克雅内斯山脊的侧翼位于地球上最大的羽状山脊系统之一上方，并被快速覆盖累积等高线漂移对受邻近深水门户影响的海洋条件敏感的沉积物提供了一个理想的自然实验室来测试有关地幔动力学、古海洋学和气候之间相互作用的假设。控制了新生代时期北大西洋的海洋门户和深水环流。国际海洋发现计划第 395 次远征期间在比约恩和加尔达尔等高线漂移点收集的样本和数据提供了显着的机会。我们对北大西洋地区沉积模式和海洋环流历史的理解将与最近钻探岩心的沉积物积累率和当前速度估计相结合，作为破译过去海洋环流模式的工具。综合考虑，所提出的模型和观测结果将为地球内部、海洋和表面领域的耦合性质提供见解。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响进行评估，被认为值得支持。审查标准。