Dynamics and Forcing of Nares Strait from 2003 to 2009: Tidal to Interannual Variability to the West of Greenland

提供资金来检验的假设，即动态的纳雷斯海峡是在一个过渡状态的季节的陆地固定冰盖减少的持续时间。具体而言，PI将解决两个可检验的假设：H1。通过加拿大群岛的淡水通量目前每年从一个动态的特点是陆地坚冰（冬季制度）到一个不同的一个characterized由移动的冰（夏季制度）。随着纳雷斯海峡的沃茨暴露于随时间变化的局部大气表面强迫以及周围北冰洋和巴芬湾的远程强迫，一个朝向更长的移动的夏季冰态的状态变化导致了更多变的冰和海洋淡水通量。为了做到这一点，他们建议分析一个全面的6年数据集，该数据集来自一系列停泊的洋流、盐度、温度、海平面、和地下压力传感器，以及冰厚观测。这些数据来自于2003-2009年加拿大-美国在北极沃茨进入格陵兰岛以西的北大西洋的主要通道--纳雷斯海峡进行的一项前所未有的、高风险的、但最终成功的观测计划。他们建议描述和解释这个充满活力的通道内的运动学和动力学的时间和空间变化的制度。由于海洋领域被迫垂直和水平边界层物理在冰-水，空气-水，冰-空气界面，该计划包括从气象建模，遥感冰（MODIS）和冰建模（CICE）组件的数据合成。

Funds are provided to test the hypothesis that the dynamics of Nares Strait is in a state of transition as the season of landfast ice cover diminishes in duration. In particular, the PIs will address two testable hypotheses:H1. Freshwater flux through the Canadian Archipelago presently transitions annually from a dynamic state characterized by land-fast ice (the winter regime) to a different onecharacterized by mobile ice (the summer regime).H2. A regime change towards a longer mobile summer ice regime leads to more variable ice and ocean freshwater flux as the waters of Nares Strait become exposed to time-dependent local atmospheric surface forcing in addition to remote forcing by the ambient Arctic Ocean and Baffin Bay.To do so, they propose to analyze a comprehensive 6-year data set from an array of moored ocean current, salinity, temperature, sea level, and subsurface pressure sensors, as well as ice thickness observations. The data originate from an unprecedented, high-risk, but ultimately successful 2003-2009 Canada-US observational program that took place in Nares Strait, a major pathway of Arctic waters into the North Atlantic to the west of Greenland. They propose to describe and explain the temporally and spatially varying regimes of kinematics and dynamics within this energetic channel. As oceanic fields are forced by vertical and horizontal boundary layer physics at the ice-water, air-water, and ice-air interfaces, the program includes synthesis of data from a meteorological modeling, a remotely-sensed ice (MODIS), and an ice modeling (CICE) component.