Shelf-Basin Exchange across the Western Arctic Boundary Current

跨北极西部边界流的陆架盆地交换

• 批准号: 0713250
• 负责人: Robert Pickart
• 金额: $ 20万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0713250&HistoricalAwards=false
• 关键词: Shelf; Basin; Exchange; across; Western

The halocline of the Arctic Ocean tends to isolate the sea ice on the surface of the ocean from the heat carried into the ocean with flows of warm Atlantic Water. Changes in the structure or persistence of this halocline will, thus, have an important influence on the rate of change of sea ice cover in the Arctic and, consequently, global climate. How this halocline is maintained is an open question, but one theory strongly implicates the lateral flux of cold waters from the shelves surrounding the Arctic Ocean.In 2002-2004 a high-resolution mooring array was situated across the shelfbreak and upper slope of the Beaufort Sea, east of Barrow Canyon. The array consisted of vertically profiling conductivity/temperature/ depth sensors (CTD Moored Profilers), combined with Acoustic Doppler Current Profilers and profiling acoustic current meters. The moorings were spaced only 5 km apart, and represent the first time that the boundary current system in the Arctic has been measured at the scale of the Rossby radius of deformation using moorings. The array returned over 3,000 synoptic cross-slope CTD sections and 18,000 absolute velocity sections, over all of the seasons. Funds are provided to carry out the analysis of this data set. The principal investigators' central hypothesis is that the dynamics of the boundary current system dictates, to first order, the transfer of mass and properties from the shelf to the open ocean, which, in turn, is thought to maintain the upper halocline of the western Arctic. The analysis effort will focus upon upwelling dynamics, eddy formation, and secondary circulation and ageostrophic dynamics.

北冰洋的盐跃层往往会将海洋表面的海冰与温暖的大西洋水流带入海洋的热量隔离开来。 因此，这种盐跃层的结构或持续性的变化将对北极海冰覆盖的变化率产生重要影响，从而对全球气候产生重要影响。 如何维持这种盐跃层是一个悬而未决的问题，但有一种理论强烈暗示冷沃茨的横向通量从货架周围的北冰洋。在2002年至2004年的高分辨率系泊阵列位于整个陆架和上斜坡的博福特海，东巴罗峡谷。该阵列由垂直剖面电导率/温度/深度传感器（CTD系泊剖面仪）、声学多普勒海流剖面仪和剖面声学海流计组成。系泊间距仅为5公里，代表了第一次在北极的边界电流系统已被测量的罗斯比变形半径的规模使用系泊。该阵列在所有季节中返回了3，000多个天气横坡CTD剖面和18，000个绝对速度剖面。为分析这一数据集提供了资金。主要研究人员的核心假设是，边界流系统的动力学决定了从大陆架到开阔洋的质量和性质转移，而这反过来又被认为维持了北极西部的上部盐跃层。分析工作将集中在上升流动力学、涡旋形成、次级环流和非地转动力学。