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

提供的资金用于对纳雷斯海峡的海洋环流和海冰相互作用进行数值模拟研究，纳雷斯海峡是一条500公里长的海峡，将格陵兰西北部与巴芬湾北方端的埃尔斯米尔岛分隔开来。该研究涉及北极/亚北极海冰和通过纳雷斯海峡的淡水交换。该项目的动机是，观察到纳雷斯海峡是北极和亚北极海洋之间淡水和海冰交换的主要通道。该方案将结合联合收割机一个高分辨率区域数值海洋环流和海冰模式，由一个高分辨率区域大气模式的输出强迫，以研究内尔斯海峡的海洋和海冰动力学和环流。这项研究的一个关键要素是提供高质量的多年观测数据集，用于模型评估和逆建模，从而能够对整个海峡进行优化的环流估计。通过这个模型，他们将测试内尔斯海峡通流（淡水，海冰和大西洋中层水）对大尺度气候因素预测变化的敏感性。虽然弗拉姆海峡，格陵兰岛和斯瓦尔巴群岛之间的开口，往往被认为是北极和大西洋之间的主要交换通道，通过加拿大群岛的狭窄通道提供了第二个通道，从北极到大西洋的流动。 这项研究将提供对控制这些交换的大小的过程的见解，这些交换被认为会影响拉布拉多海稠密水的形成，然后进入大西洋，有助于大规模环流，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.