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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >The Baltic Sea Tracer Release Experiment: 2. Mixing processes
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The Baltic Sea Tracer Release Experiment: 2. Mixing processes

机译：波罗的海示踪剂释放实验：2.混合过程

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摘要

Deep water mixing processes in the largest basin of the Baltic Sea (Gotland Basin) are investigated here with the help of long-term moored instrumentation and turbulence microstructure measurements.Budgets for heat and salinity reveal a strong temporal variability in the deep water mixing coefficients that is shown to be coupled to the wind forcing down to time scales of individual wind events.Consistent with the results from a simultaneously conducted tracer release experiment, near-boundary turbulence was identified as the key processes for basin-scale mixing.Turbulent bottom boundary layers were found to be thick and stable in the flat,deep part of the basin,where highest dissipation rates were observed,and comparatively thin, less energetic,and highly variable on the slopes due to a permanent tendency for boundary layer restratification.In the absence of internal tides,strongly damped basin-scale topographic waves with periods of a few days,a deep rim current,and,to a smaller extent,near-inertial waves were identified as the main energy sources for boundary mixing.These results are likely to be relevant also for other medium-sized stratified basins.
机译：借助长期的系泊仪器和湍流微结构测量，本文研究了波罗的海最大盆地（哥得兰盆地）的深水混合过程。热量和盐度预算显示深水混合系数具有很强的时间变化性，结果表明，与风强迫有关的是风速降到单个风事件的时间尺度。与同时进行的示踪剂释放实验的结果一致，近边界湍流被确定为盆地尺度混合的关键过程。湍流底部边界层在盆地的平坦，较深的部分发现厚而稳定，观察到了最高的耗散率，并且由于边界层重新定形的永久趋势，在斜坡上相对较薄，能量较低且变化很大。内部潮汐，强烈衰减的盆地规模地形波，周期为几天，边缘流很深，并且延伸范围较小t，近惯性波被认为是边界混合的主要能源。这些结果可能也与其他中型分层盆地有关。

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