Collaborative Research: POISE (Petermann Ocean Ice Shelf Experiment)-Modeling Ocean Ice Interactions

为纳尔斯海峡海洋环流和海冰相互作用的数值模拟研究提供了资金，纳尔斯海峡是一条500公里长的海峡，将格陵兰西北部与巴芬湾北端的埃尔斯米尔岛分开。这项研究既涉及北极/亚北极海冰，也涉及通过纳尔斯海峡的淡水交换。该项目的动机是观察到纳雷斯海峡是北冰洋和亚北冰洋之间淡水和海冰交换的主要通道。PIS将结合高分辨率区域海洋环流和海冰模式，受高分辨率区域大气模式输出的强迫，研究纳雷斯海峡的海洋和海冰动力学和环流。这项研究的一个关键因素是提供高质量的多年观测数据集，用于模型评估和反向建模，从而能够对整个海峡进行优化的环流估计。通过这个模型，他们将测试Nares海峡通流(淡水、海冰和大西洋中间水)对更大尺度气候因素预测变化的敏感度。尽管格陵兰和斯瓦尔巴群岛之间的开口处弗拉姆海峡通常被认为是北冰洋和大西洋之间的主要交换通道，但通过加拿大群岛的较窄通道为从北极流向大西洋提供了第二条通道。这项研究将对控制这些交换的大小的过程提供洞察，这些交换被认为影响了拉布拉多海稠密水的形成，然后进入大西洋，促进了大范围的环流，并调节了气候。

Funds are provided for a numerical modeling study of ocean circulation and ocean-ice interaction in Nares Strait, a 500-km long channel that separates northwest Greenland from Ellesmere Island at the northern end of Baffin Bay. The research addresses both Arctic/sub-Arctic sea-ice and freshwater exchange through Nares Strait. The project is motivated by the observation that Nares Strait is a major conduit of freshwater and sea-ice exchange between the Arctic and sub-Arctic oceans. The PIs will combine a high-resolution regional numerical ocean circulation and sea-ice model, forced by output from a high-resolution regional atmospheric model, to study the ocean and sea-ice dynamics and circulation in Nares Strait. A key element of this study is the availability of a high-quality, multi-year observational data set for model evaluation and for inverse modeling that will allow development of an optimized circulation estimate for the entire strait. With this model they will test the sensitivity of Nares Strait throughflow (freshwater, sea ice, and Atlantic Intermediate Water) to projected changes in larger-scale climate factors. Although Fram Strait, the opening between Greenland and Svalbard, is often assumed to provide the dominant exchange pathway between the Arctic and Atlantic Oceans, the narrower passages through the Canadian Archipelago provide a second pathway for flow from the Arctic to the Atlantic Ocean. This study will provide insight on the processes controlling the magnitude of these exchanges, which are believed to influence the formation of dense water in the Labrador Sea that then enters the Atlantic Ocean, contributes to the large scale circulation, and modulates climate.