The North Atlantic Oscillation Over Three Millennia

三千年来的北大西洋涛动

• 批准号: 1405160
• 负责人: Lloyd Keigwin
• 金额: $ 42.74万
• 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: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1405160&HistoricalAwards=false
• 关键词: North; Atlantic; Oscillation; Over; Three

The North Atlantic Oscillation (NAO), defined as the atmospheric pressure differences between the Iceland Low and Azores High, is a dominant feature of climate in the North Atlantic region and is associated with climate changes at interannual and interdecadal timescales. The NAO is also associated with changes in temperature, salinity, and circulation patterns in the northwest Atlantic, but high-quality instrumental records of these variables are only available for the past 60 years. This project, led by a researcher from the Woods Hole Oceanographic Institution, will develop the first long term record of the ocean's response to the NAO. Specifically, benthic foraminiferal stable oxygen isotope records from sediment cores from the Gulf of Maine, Scotian shelf, and the Newfoundland continental shelf will be used to reconstruct temperature and salinity patterns in sea surface conditions associated with positive and negative phases of the NAO. The project will include a research expedition to collect sediment cores that are not available in existing collections. The results will complement land-based NAO records and together these data sets should provide a holistic picture of the atmosphere-ocean-cryosphere variability in the North Atlantic region over the past few millennia. Funding also supports research opportunities for graduate and undergraduate students, and an at-sea research experience for a high school teacher.

北大西洋振荡（NAO）被定义为冰岛低位和亚速尔群岛高的大气压力差异，是北大西洋地区气候的主要特征，与年际和青年际时期尺度上的气候变化有关。 NAO还与西北大西洋的温度，盐度和循环模式的变化有关，但是这些变量的高质量工具记录仅在过去60年中可用。该项目由伍兹孔海洋学机构的研究人员领导，将发展海洋对NAO的回应的第一长期记录。具体而言，底栖有孔虫稳定的氧同位素记录来自缅因州海湾，斯科舍省货架和纽芬兰大陆架的沉积物核心，将用于重建与NAO正面和负相关的海面条件中的温度和盐度模式。该项目将包括一项研究探险，以收集现有收藏中无法使用的沉积物核心。结果将补充基于陆地的NAO记录，这些数据集应为过去几千年来北大西洋地区的大气 - 晶体变异性提供整体图片。资金还支持研究生和本科生的研究机会，以及高中老师的海上研究经验。