Holocene reconstructions of Iceland-Scotland Overflow and the Deep Western Boundary Current

冰岛-苏格兰溢流和西部深边界流的全新世重建

• 批准号: 1304291
• 负责人: Delia Oppo
• 金额: $ 54.69万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-05-01 至 2015-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1304291&HistoricalAwards=false
• 关键词: Holocene; reconstructions; Iceland; Scotland; Overflow

Changes in the Atlantic Meridional Overturning Circulation (AMOC) can seriously impact regional climate and the global hydrologic cycle. However, variations in this ocean circulation system during the Holocene are poorly understood. The proposed work will address this knowledge gap by generating Holocene-length grain size records with well-constrained chronology, using high-accumulation cores spanning the depth range of the Deep Western Boundary Current (DWBC, or the main pathway by which water sinking in the North Atlantic flows southward at depth). These records will complement similar records from the Iceland-Scotland overflow, helping to define the coupling between the two circulation pathways. In addition, the project will collect cores from both sites to produce more detailed grain size records focusing on the past 2,000 years, when climate forcing is relatively well understood. Interpreted in the context of model sensitivity studies, the records will help to explain the mechanisms and dynamics of long-term AMOC changes during the Holocene. This research, led by researchers at the Woods Hole Oceanographic Institution, will improve our understanding of and capacity to predict ocean circulation changes that are associated with climate change. The project will support an early-career scientist in establishing a long-term collaboration with senior researchers, and will strengthen international ties via collaboration with scientists from the UK and the Netherlands. A graduate or undergraduate student will be involved in the field campaign.

大西洋经向翻转环流（AMOC）的变化会严重影响区域气候和全球水文循环。然而，人们对全新世海洋环流系统的变化知之甚少。拟议的工作将通过使用跨越深西边界流（DWBC，或水在西部地区下沉的主要路径）深度范围的高积累岩心，生成具有良好约束年代学的全新世长度的粒度记录来解决这一知识差距。北大西洋在深处向南流动）。这些记录将补充冰岛-苏格兰溢流的类似记录，有助于确定两条循环路径之间的耦合。 此外，该项目还将从两个地点收集岩心，以生成更详细的粒度记录，重点关注过去 2,000 年，当时的气候强迫相对较好地了解。在模型敏感性研究的背景下进行解释，这些记录将有助于解释全新世期间 AMOC 长期变化的机制和动态。这项研究由伍兹霍尔海洋研究所的研究人员领导，将提高我们对与气候变化相关的海洋环流变化的理解和预测能力。该项目将支持早期职业科学家与高级研究人员建立长期合作，并将通过与英国和荷兰科学家的合作加强国际联系。研究生或本科生将参与实地活动。