The Ocean General Circulation near 1000-m Depth

M. Ollitrault; Alain Colin de Verdiere

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The Ocean General Circulation near 1000-m Depth

机译：1000米深处的海洋总环流

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The mean ocean circulation near 1000-m depth is estimated with 100-km resolution from the Argo float displacements collected before 1 January 2010. After a thorough validation, the 400000 or so displacements found in the 950-1150 dbar layer and with parking times between 4 and 17 days allow the currents to be mapped at intermediate depths with unprecedented details. The Antarctic Circumpolar Current (ACC) is the most prominent feature, but western boundary currents (and their recirculations) and alternating zonal jets in the tropical Atlantic and Pacific are also well defined. Eddy kinetic energy (EKE) gives the mesoscale variability (on the order of 10 cm~2s~(-2) in the interior), which is compared to the surface geostrophic alti-metric EKE showing e-folding depths greater than 700 m in the ACC and northern subpolar regions. Assuming planetary geostrophy, the geopotential height of the 1000-dbar isobar is estimated to obtain an absolute and deep reference level worldwide. This is done by solving numerically the Poisson equation that results from taking the divergence of the geostrophic equations on the sphere, assuming Neumann boundary conditions.

机译：根据2010年1月1日之前收集的Argo浮体位移，以100 km的分辨率估算了1000 m深度附近的平均海洋环流。经过彻底验证，在9500-1150 dbar层中发现了40万左右位移，停泊时间为4天和17天可以将电流映射到具有前所未有的细节的中间深度。南极极地洋流（ACC）是最突出的特征，但热带大西洋和太平洋的西部边界洋流（及其回流）和交替的纬向射流也得到了很好的定义。涡动能（EKE）给出了中尺度的变化性（内部为10 cm〜2s〜（-2）的量级），与表面地转高度EKE进行了比较，表明E折叠深度大于700 m。 ACC和北部亚极地区。假设地球发生了地球运动，估计1000 dbar等压线的地势高度将在全球范围内获得绝对且深的参考水平。这是通过数值求解泊松方程来完成的，该泊松方程是在假设诺伊曼边界条件的情况下，通过取球上地转方程的发散度而得出的。

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《Journal of Physical Oceanography》 |2014年第1期|384-409|共26页
作者
M. Ollitrault; Alain Colin de Verdiere;
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作者单位

Laboratoire de Physique des Oceans, IFREMER, Centre de Brest, BP 70, 29280 Plouzane, France;

Laboratoire de Physique des Oceans, Universite de Bretagne Occidentale, Brest, France;

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The Ocean General Circulation near 1000-m Depth

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