SOUND-SPEED MEASUREMENTS NEAR THE OCEAN SURFACE

SOUND-SPEED MEASUREMENTS NEAR THE OCEAN SURFACE
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靠近海洋表面的声速测量

DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
W. Melville
W. Melville
中科院分区：
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文献类型：
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作者：
É. Lamarre;W. Melville

文献摘要

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本文报告了1992年秋季进行的两次近海面声速测量的现场实验结果。该测量技术利用发射器和接收器之间相隔40厘米的短声脉冲的传播时间[Lamarre和Melville，J.Atmos。和海洋科技。(1994)]。该仪器能够同时测量六个深度的声速，从0.5米开始，频率范围从5到40千赫。声速的时间序列在几分钟或更短的时间内显示出剧烈的波动。这归因于气泡羽流的形成或气泡云的通过。在两个特殊的例子中，一个新产生的气泡羽流在0.5m的深度产生了800m/S的声速下降；一个老的气泡云25-S产生了400m/S的下降。在中等风速条件下(8m/S)，经常观察到超过100m/S的音速下降。不同深度的信号。
The results of two field experiments conducted in the fall of 1992 on the measurement of sound speed near the ocean surface are reported. The measurement technique makes use of the travel time of short acoustic pulses between a transmitter and a receiver separated by 40 cm [Lamarre and Melville, J. Atmos. and Oceanic Tech. (1994)]. The instrument is capable of making simultaneous measurements of the sound speed at six depths, starting at 0.5 m, over a frequency range from 5 to 40 kHz. Time series of sound speed show dramatic fluctuations over time periods on the order of minutes or less. These are attributed to the formation of bubble plumes or the passage of bubble clouds. In two particular instances, a newly created bubble plume generated a sound‐speed reduction of 800 m/s at a depth of 0.5 m; and a bubble cloud 25‐s old generated a reduction of 400 m/s. Frequent occurrences of sound‐speed reductions greater than 100 m/s are observed during moderate wind conditions (8 m/s). The signals at various depths...