Collaborative Research: POISE - Modeling Ocean-Ice Interactions

为纳尔斯海峡的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。该研究涉及通过纳尔斯海峡的北极/亚北极海冰和淡水交换。该项目的动机是观察到纳尔斯海峡是北极和亚北极海洋之间淡水和海冰交换的主要渠道。pi将结合高分辨率区域数值海洋环流和海冰模式，由高分辨率区域大气模式的输出强制，研究纳尔斯海峡的海洋和海冰动力学和环流。本研究的一个关键要素是提供高质量的多年观测数据集，用于模式评估和逆向建模，这将允许对整个海峡进行优化的环流估计。有了这个模型，他们将测试纳尔斯海峡通流（淡水、海冰和大西洋中间水）对更大规模气候因素预测变化的敏感性。虽然格陵兰岛和斯瓦尔巴群岛之间的弗拉姆海峡通常被认为是北极和大西洋之间主要的交换通道，但通过加拿大群岛的较窄通道为北极到大西洋的流动提供了第二条通道。这项研究将提供对控制这些交换幅度的过程的见解，这些交换被认为影响拉布拉多海致密水的形成，然后进入大西洋，促进大规模环流，并调节气候。

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.