Near-Inertial Mixing in the Central Arctic Ocean

Ilker Fer

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Near-Inertial Mixing in the Central Arctic Ocean

机译：北冰洋中的近惯性混合

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Observations were made in April 2007 of horizontal currents, hydrography, and shear microstructure in the upper 500 m from a drifting ice camp in the central Arctic Ocean. An approximately 4-day-long time series, collected about 10 days after a storm event, shows enhanced near-inertial oscillations in the first half of the measurement period with comparable upward- and downward-propagating energy. Rough estimates of wind work and near-inertial flux imply that the waves were likely generated by the previous storm. The near-inertial frequency band is associated with dominant clockwise rotation in time of the horizontal currents and enhanced dissipation rates of turbulent kinetic energy. The vertical profile of dissipation rate shows elevated values in the pycnocline between the relatively turbulent underice boundary layer and the deeper quiescent water column. Dissipation averaged in the pycnocline is near-inertially modulated, and its magnitude decays approximately at a rate implied by the reduction of energy over time. Observations suggest that near-inertial energy and internal wave-induced mixing play a significant role in vertical mixing in the Arctic Ocean.

机译：在2007年4月对北冰洋中部流冰营地上方500 m处的水平洋流，水文学和剪切微结构进行了观测。在风暴事件发生约10天后收集的大约4天的时间序列显示，在测量周期的前半段，近惯性振荡增强了，向上和向下传播的能量相当。对风功和近惯性通量的粗略估计表明，这些波很可能是前一次风暴产生的。接近惯性的频带与水平电流在时间上的显性顺时针旋转和湍动能的耗散率提高相关。消散速率的垂直剖面表明，在较湍流的地下边界层和较深的静止水柱之间的比多辛线有较高的值。碧容星的平均耗散几乎是惯性调制的，其大小大约以能量随时间减少所隐含的速率衰减。观测表明，近惯性能量和内波诱导的混合在北冰洋的垂直混合中起重要作用。

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《Journal of Physical Oceanography》 |2014年第8期|2031-2049|共19页
作者
Ilker Fer;
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Geophysical Institute, University of Bergen, Allegaten 70, 5007 Bergen, Norway;

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Near-Inertial Mixing in the Central Arctic Ocean

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