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

提供资金来检验这样一种假设，即随着陆地冰盖季节的持续时间减少，纳尔海峡的动态处于过渡状态。特别是，PI将解决两个可测试的假设：H1。目前，通过加拿大群岛的淡水流量每年都会从以陆上坚冰为特征的动态(冬季状态)转变为以流动冰为特征的不同状态(夏季状态)。由于Nares海峡水域除了受到周围北冰洋和巴芬湾的远程强迫外，还暴露在与时间相关的局部大气表面强迫之下，朝向更长时间流动的夏季冰川状况的变化导致冰和海洋淡水通量的变化。为此，他们建议分析一系列系泊洋流、盐度、温度、海平面和次表层压力传感器以及冰厚度观测的综合6年数据集。这些数据来自一个史无前例的、高风险的、但最终成功的2003-2009年加拿大-美国观测项目，该项目在北冰洋格陵兰岛以西的纳雷斯海峡进行，这是北极水域进入北大西洋的主要通道。他们建议描述和解释这一能量通道内运动学和动力学在时间和空间上的变化状态。由于在冰-水、空气-水和冰-空气界面上的垂直和水平边界层物理强迫海洋场，该程序包括来自气象模拟、遥感冰(MODIS)和冰模拟(CICE)组件的数据的合成。

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.