Evolution of Glacial Meltwater in the North Atlantic Current - Subpolar Front System

北大西洋洋流-副极锋系统中冰川融水的演化

• 批准号: 2202771
• 负责人: Olivier Marchal
• 金额: $ 44.96万
• 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: 2022
• 资助国家: 美国
• 起止时间: 2022-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2202771&HistoricalAwards=false
• 关键词: Evolution; Glacial; Meltwater; North; Atlantic

The melting of the great ice sheets of the last Ice Age caused sea level to rise by about 130 m globally. In this project a computer model will be developed to simulate the pathways of glacial water introduced into the North Atlantic Ocean from the Laurentide Ice Sheet – the great ice sheet that covered northern North America during the last Ice Age. The project will include modeling of small-scale eddies and their influence on glacial water movements which will help in the understanding of the ocean’s response to ice sheet changes. The results will be important for understanding the role of glacial waters released today from other ice sheets such as the Greenland Ice Sheet. The project will support a graduate student and three undergraduate students, and a how-to manual will be produced so that scientists can use or adapt the model for other projects.A numerical model which represents ocean circulation and sea ice and which resolves ocean mesoscale eddies will be developed to produce detailed simulations of the evolution of glacial water in the North Atlantic Current-Subpolar Front system. Focus will be on glacial meltwater which emanated from the Laurentide Ice Sheet at different locations along the Labrador Shelf, where evidence for ice streams delivering material into the sub-polar gyre exists, and through Fram Strait, which will allow representation of a source of meltwater from the Arctic Ocean, and in particular the Mackenzie River. Two questions will be addressed: (1) To which extent are the temperature and salinity of glacial waters modified as they flow towards deep-water formation areas in the northern North Atlantic? (2) Which processes (eddy-induced mixing or air-sea interactions) most effectively modify the properties of glacial waters en route to these areas? The work plan to address these questions is threefold. First, a coupled ocean circulation-sea-ice model will be configured to represent the subpolar North Atlantic. Second, the coupled model will be tested by using modern observations from oceanographic cruises, hydrographic climatologies, and satellite missions. Finally, experiments with the coupled model will be conducted and analyzed to quantify the erosion of glacial water properties en route to deep-water formation regions and evaluate the role of different eroding factors.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.

最后的冰的融化导致全球海平面上升约130 m，以模拟从劳伦德（Laurentide）冰盖（Laurentide Ice）引入北大西洋的冰川水的途径，这是上一个冰河时代覆盖北部北部的伟大。对冰川的运动将有助于海洋对ICEAN对ECESHET的反应，这对于今天的其他冰块（例如Greenland Ices）的角色很重要。并将制作一项操作手册，以便科学家可以将模型使用或适应其他项目。代表海洋循环的数值模型以及哪些分辨率海洋中尺度编辑将被逐渐逐渐逐渐制作，以详细介绍详细的模拟冰川水在北大西洋电流 - 波形前系统。从北极海洋，尤其是麦肯河河中，将解决两个问题：（1）d的北部大西洋河流的流动范围（2）？涡流诱导的混合或空气互动）是三倍。卫星任务与耦合模型进行了量化，以量化Deep-Water形成区域的途径，但使用基金会的智力优点和更广泛的影响。