Direct measurements of the mean flow and eddy kinetic energy structure of the upper ocean circulation in the NE Atlantic
Direct measurements of the mean flow and eddy kinetic energy structure of the upper ocean circulation in the NE Atlantic
复制标题
直接测量东北大西洋上层海洋环流的平均流量和涡动能结构
DOI：
10.1029/2005gl023615
复制
发表时间：
2005
影响因子：
5.2
通讯作者：
B. Hansen
中科院分区：
文献类型：
--
作者：
Ø. Knutsen;H. Svendsen;S. Østerhus;T. Rossby;B. Hansen
由于强而多变的风强迫和强而多变的深流导致使用标准动力学方法时存在很大的不确定性，亚极东北大西洋的上层海洋环流一直是一个难以量化的挑战。自1999年以来，我们一直在一艘集装箱船上运行声学多普勒海流剖面仪，该船在丹麦和格陵兰岛之间航行，反复采样东北大西洋的上层洋流。个别断面表现出高能量的中尺度变异性，但断面的集合平均揭示了雷克雅脊平均场的显著组织：沿着东坡有明显的南向流动，以及两个明确定义的峰值，季节性调制沿着西坡向北流动。沿断面观测到较高的涡动动能值(约150-600cm2 S−2)，比地表漂移估计的大O(1.5)。
The upper ocean circulation in the sub‐polar northeast Atlantic has been a challenge to quantify due to strong and variable wind‐forcing, and strong and variable deep currents that lead to large uncertainties in the use of the standard dynamical method. Since 1999 we have been operating an acoustical Doppler current profiler on a container vessel that operates between Denmark and Greenland to repeatedly sample upper ocean currents across the northeast Atlantic. Individual transects exhibit a highly energetic mesoscale variability, but ensemble‐averaging of the sections reveals a striking organization of the mean field along the Reykjanes Ridge: a distinct southward flow along its eastern slope and two clearly defined peaks with seasonal modulation flowing to the north along its western slope. Higher values of eddy kinetic energy (about 150–600 cm2 s−2) are observed along the transect, O(1.5) greater than surface drifter estimates.