The relative effect of particles and turbulence on acoustic scattering from deep sea hydrothermal vent plumes revisited.
The relative effect of particles and turbulence on acoustic scattering from deep sea hydrothermal vent plumes revisited.
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重新审视颗粒和湍流对深海热液喷口羽流声散射的相对影响。
DOI：
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发表时间：
2011
影响因子：
2.4
通讯作者：
K. Bemis
中科院分区：
文献类型：
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作者：
Guangyu Xu;D. Jackson;K. Bemis
悬浮颗粒和湍流的相对重要性，作为后向散射机制内的热液羽位于胡安德富卡海脊的奋进段的声学后向散射测量有线观测台通风口成像声纳（COVIS）与模型计算的基础上，在现场样品的颗粒悬浮在羽流。对羽流样品的分析产生了颗粒的质量浓度和尺寸分布的估计，这些估计被用来量化它们对声学后向散射的贡献。结果表明，在初始的10米的羽流上升的声学后向散射羽粒子的影响可以忽略不计。这表明，在较低水平的羽流中，由辐射引起的温度波动是主要的后向散射机制。此外，反演所观察到的声学背向散射的羽流内的温度的标准偏差产生一个合理的匹配与原位温度测量的电导率-温度-深度仪器。这一发现表明，热液引起的温度波动是主要的后向散射机制，并表明了利用声后向散射作为遥感工具来测量热液羽流内温度变化的潜力。
The relative importance of suspended particles and turbulence as backscattering mechanisms within a hydrothermal plume located on the Endeavour Segment of the Juan de Fuca Ridge is determined by comparing acoustic backscatter measured by the Cabled Observatory Vent Imaging Sonar (COVIS) with model calculations based on in situ samples of particles suspended within the plume. Analysis of plume samples yields estimates of the mass concentration and size distribution of particles, which are used to quantify their contribution to acoustic backscatter. The result shows negligible effects of plume particles on acoustic backscatter within the initial 10-m rise of the plume. This suggests turbulence-induced temperature fluctuations are the dominant backscattering mechanism within lower levels of the plume. Furthermore, inversion of the observed acoustic backscatter for the standard deviation of temperature within the plume yields a reasonable match with the in situ temperature measurements made by a conductivity-temperature-depth instrument. This finding shows that turbulence-induced temperature fluctuations are the dominant backscattering mechanism and demonstrates the potential of using acoustic backscatter as a remote-sensing tool to measure the temperature variability within a hydrothermal plume.