Wireline tap on the construction of the North Atlantic Deep water - IODP Exp. 395 "Reykjanes Mantle Convection and Climate"

北大西洋深水建设中的有线接入 - IODP Exp.

• 批准号: NE/W002310/1
• 负责人: Sarah Davies
• 金额: $ 2.97万
• 依托单位: University of Leicester
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FW002310%2F1
• 关键词: Wireline; tap; construction; North; Atlantic

Ocean circulation patterns especially within the deep ocean are a major player in global heat exchange and therefore force and stabilize climate patterns. In the North Atlantic, deep water masses are influenced by two main factors changing deep water strength and composition over time, the potential of water exchange with the Arctic Ocean and the development of the Northern hemisphere glaciation. The overflow across the Greenland-Iceland-Scotland Ridge, one of only two areas, where Arctic Ocean waters are exchanged with the world's oceans, can be shut off by the periodically strong pulsation of the Iceland mantle plume or in more recent times by glaciation of the Northern Seas and its surrounding land masses. In such an event, deep water circulation within the North Atlantic slows significantly, leading among other effects to a colder and more unstable climate in Western Europe.In this project, we propose to reconstruct the past behavior of deep water currents within the North Atlantic, by analyzing downhole logging data collected during IODP Expedition 395 "Reykjanes Ridge Mantle Convection and Climate". The drill sites are located in a transect along 60N, which represent a millennial scale archive of deep ocean sedimentation and current behavior ranging up to 12 Ma in the past to the Miocene. Downhole logging data will be collected after coring and has the advantages of being an in-situ continuous measurement through the strata, bridging potential gaps in core recovery. Recent experiments to measure current strength within the Atlantic has revealed, a decline in current strength in the recent past making the current circulation the weakest in the last millennia. Years of especially weak Atlantic currents correlate with an increase in weather events such as storms and floods within the British Isles and the rest of Western Europe. Understanding the past behavior of deep ocean circulation will therefore allow us to inform climate models used to predict severe weather events and use these predictions to minimize their impacts.

海洋循环模式，尤其是在深海内部是全球热量交换中的主要参与者，因此势力并稳定气候模式。在北大西洋，深水肿块受两个主要因素，随着时间的流逝而改变深水强度和成分，与北极海洋交换的潜力以及北半球冰川的发展。横跨格陵兰 - 伊奇兰 - 斯科特兰山脊，仅有两个区域之一，北极海水与世界海洋交换，可以通过冰岛地幔羽毛的周期性强烈脉动或最近的北部海洋及其周围陆地的冰川化而被关闭。 In such an event, deep water circulation within the North Atlantic slows significantly, leading among other effects to a colder and more unstable climate in Western Europe.In this project, we propose to reconstruct the past behavior of deep water currents within the North Atlantic, by analyzing downhole logging data collected during IODP Expedition 395 "Reykjanes Ridge Mantle Convection and Climate".钻头位置位于沿60n的样带中，该钻头代表了深海沉积的千禧年量表档案，过去到中新世，最高12 mA的当前行为。加油后将收集井下记录数据，并具有通过地层进行原位连续测量的优点，在核心恢复中弥合了潜在的差距。最近衡量大西洋当前强度的实验表明，最近的当前强度下降使当前的循环在上一千年中成为最弱的。多年的大西洋水流尤其与不列颠群岛和西欧其他地区的风暴和洪水等天气事件的增加有关。因此，了解深海循环的过去行为将使我们能够为用于预测恶劣天气事件的气候模型提供信息，并使用这些预测来最大程度地减少其影响。

项目成果

Expedition 395C Preliminary Report: Reykjanes Mantle Convection and Climate: Crustal Objectives

395C 探险队初步报告：雷克雅内斯地幔对流和气候：地壳目标

• DOI: 10.14379/iodp.pr.395c.2022
• 发表时间: 2022
• 作者: Parnell-Turner R