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首页> 外文期刊>Journal of Physical Oceanography >Variability and Mixing of the Filchner Overflow Plume on the Continental Slope, Weddell Sea
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Variability and Mixing of the Filchner Overflow Plume on the Continental Slope, Weddell Sea

机译：韦德尔海陆坡上Filchner溢流羽的变异性和混合

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摘要

A large fraction of Antarctic Bottom Water is produced in the Weddell Sea, through mixing between the cold and dense shelf water masses and the warm and saline off-shelf water. We present observations of the dense Filchner overflow plume from one mooring at the Filchner sill and two moorings located downstream, on the continental slope. The plume variability over the continental slope at a monthly time scale is related to upstream conditions at the Filchner sill, with a high correlation in density. Revised column-integrated volume transport calculations across the Filchner sill indicate 50% higher values in 2010 compared with the earlier estimates available from 1985. Over the continental slope, the plume thickness fluctuates strongly between less than 25 m and more than 250 m. Observations of elevated temperature variance and high Froude numbers at the plume interface imply high mixing rates and entrainment of ambient water masses. The mixing events typically coincide with shear spikes across the plume. The shear spikes appear quasi-periodically, when counterrotating oscillations with periods of 24 and 72 h align. The clockwise 24-h oscillation is related to diurnal, barotropic tidal currents and topographic vorticity waves, whereas the counterclockwise 72-h oscillation is related to vortex stretching or topographic vorticity waves.
机译：通过在冷的和密集的架子水团与温暖的和盐水的现成水之间混合，在韦德尔海产生了大部分的南极底水。我们从Filchner窗台的一个系泊和大陆坡下游的两个系泊提供了密集的Filchner溢流羽流的观测结果。大陆坡上每月时间尺度上的羽流变化与菲尔克纳门槛的上游条件有关，密度的相关性很高。修正后的整个Filchner窗台的整体柱体积输运计算表明，与1985年之前的早期估计相比，2010年的数值高出50％。在大陆坡上，羽流厚度在小于25 m到大于250 m的范围内剧烈波动。在羽流界面处观察到温度变化高和弗洛德数高的现象表明，混合速率高且夹带了周围的水团。混合事件通常与羽流上的剪切尖峰同时发生。当周期为24 h和72 h的反向旋转振荡对齐时，剪切峰值出现在准周期中。顺时针24小时振荡与昼夜正压潮流和地形涡度波有关，而逆时针72小时振荡与涡旋伸展或地形涡度波有关。

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