SGER - Radium Tracer Sampling of Eddies off the Beaufort Shelf

北冰洋的大陆架面积约占世界总面积的25%，尽管这片海域只占海洋总水量的2%。因此，冰架对北极的影响异常之大。众所周知，大陆架对海水组成的影响可以通过测量镭同位素的各种比率来量化。与海洋水域相比，陆架水域的Ra228 （T = 5.77 yr）和Ra224 （T = 3.64 da）都有所升高，这些物种与Ra226 （T = 1620 yr）的比率可以衡量陆架的相对影响。该SGER建议将镭测量纳入2004年9月至10月的陆架-盆地相互作用计划巡航中（R. Pickart，首席科学家）。这项工作将包括两个部分：(1)在边界流核心（沿着波弗特海大陆架）进行的测量将揭示边界流水的年龄和组成，(2)在该地区小漩涡的物理海洋学调查中进行的镭同位素测量将揭示漩涡水的来源，以及可能的命运。这项工作将通过原位系泊加强自主数据收集，提供有关波弗特大陆架外涡流形成的新信息，并最终将镭测量纳入自主数据收集工作，如拟议的北坡天文台。

The shelf areas of the Arctic Ocean comprise some 25% of the world's total, even though that sea contains only 2% of the ocean's waters. The influence of the shelf, then, is anomalously high in the Arctic.It is known that the influence of the shelf on the composition of ocean waters can be quantified through measurements of various ratios of radium isotopes. Both Ra228 (T = 5.77 yr) and Ra224 (T = 3.64 da) are elevated in shelf waters as compared to oceanic waters, and the ratio of these species to Ra226 (T = 1620 yr) yields measures of the relative influence of the shelf.This SGER proposes to have radium measurements incorporated into the 2004 Shelf-Basin Interaction Program cruise of Sep-Oct (R. Pickart, Chief Scientist). The work will entail two parts:(1) measurements taken in the core of the boundary current (along the Beaufort Sea shelf) will reveal the age and makeup of the boundary current water, and (2) radium isotope measurements taken during physical oceanographic surveys of small eddies in the region will reveal the source of the eddy water, and possibly its fate. This work will enhance the autonomous data collection by in situ moorings, provide new information on eddy formation off the Beaufort shelf, and lead to eventual incorporation of radium measurements in autonomous data collection efforts such as the proposed North Slope observatory.