Eddies and finestructure variability in the NAC

NAC 中的涡流和精细结构变异性

• 批准号: 165831565
• 负责人: Dr. Maren Walter
• 金额: --
• 依托单位: Abteilung Ozeanographie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/165831565?language=en
• 关键词: Eddies; finestructure; variability; NAC

Observational estimates of elevated vertical diffusivity in regions of high mesoscale eddy activity point toward the relevance of energy loss from eddies to maintain the ocean stratification. Estimates of net energy transfers between the internal wave field and a mesoscale eddy field indicate wave–eddy coupling as an important source of internal wave energy, and thus mixing, in the deep ocean. Here it is proposed to investigate the relation of eddies in two energetic regions, the North Atlantic Current (NAC) and the Antarctic Circumpolar Current (ACC), to finescale variability of the internal wave field observed in vertical profiles of density and velocity. The study has the major objectives to find relations between finescale variance and external properties of the mesoscale flow estimated from satellite and shipboard observations, and to examine the role of topographyflow interaction for the spatial distribution of finescale variance. The results from the NAC will be compared to the estimates from the ACC, where additionally the long-term variability of finescale variance in relation to the wind stress strengthening in the region of the ACC will be investigated.

在中尺度涡动活动高的地区，观测估计的垂直扩散率升高指向涡动能量损失的相关性，以维持海洋分层。内波场和中尺度涡流场之间的净能量传递的估计表明，波涡耦合作为内波能量的重要来源，从而混合，在深海。在这里，它建议调查的关系，涡在两个充满活力的地区，北大西洋电流（NAC）和南极绕极电流（ACC），精细尺度变化的内部波场的密度和速度的垂直剖面中观察到。本研究的主要目的是寻找细尺度方差与卫星和船载观测中尺度流的外部性质之间的关系，并研究地形流相互作用对细尺度方差空间分布的作用。NAC的结果将与ACC的估计值进行比较，此外，还将研究ACC区域风应力加强相关的细尺度方差的长期变化。