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）的变化会对区域气候和全球水文循环产生严重影响。然而，在这个海洋环流系统在全新世的变化知之甚少。拟议的工作将通过生成具有良好约束的年代学的全新世长度粒度记录来解决这一知识空白，使用跨越西部深层边界流（DWBC，或北大西洋下沉水在深度上向南流动的主要通道）深度范围的高积累岩心。这些记录将补充冰岛-苏格兰溢流的类似记录，有助于确定两个环流路径之间的耦合。 此外，该项目还将从这两个地点收集岩芯，以产生更详细的粒度记录，重点是过去2,000年，当时气候强迫相对较好地理解。在模型敏感性研究的背景下解释，记录将有助于解释的机制和动态的长期AMOC变化在全新世。这项由伍兹霍尔海洋研究所的研究人员领导的研究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。一名研究生或本科生将参与实地活动。