Microstructure profiler to study mixing and turbulent transport processes
Microstructure profiler to study mixing and turbulent transport processes
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用于研究混合和湍流传输过程的微观结构分析仪
DOI：
10.1109/oceans.1998.725732
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
A. Stips
中科院分区：
文献类型：
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作者：
H. Prandke;A. Stips
MST（微结构湍流）剖面仪是一种新开发的用于海洋湍流测量的实用微结构测量系统。该剖面仪可用于下沉和上升测量，并配有新型电流剪切传感器。作者已经在几个现场测量活动中测试了MST Profiler。研究的重点是剖面仪的内部振动水平及其对耗散率估计的下限检测（伪耗散）。测试测量没有显示明显的内部剖面振动干扰耗散测量。在下沉速度低于0.4 m/s的安静条件下，剖面仪的伪耗散水平（噪声）低至5.10/sup -12/ W/kg。在下沉速度为0.8 m/s时，得到了4.10/sup -11/ W/kg的伪耗散。在有附加剖面振动源的上升测量中，伪耗散大约是下沉测量的两倍。根据剪切传感器的几何形状估计了检测上限。耗散率可达10/sup -4/ W/kg，无需校正剪切谱的未解析方差。
The MST (Microstructure-Turbulence) Profiler is a newly developed operational microstructure measuring system for marine turbulence measurements. The profiler can be used for sinking and uprising measurements and is equipped with a new type of current shear sensor. The authors have tested the MST Profiler in several field measuring campaigns. The investigations were focused on the internal vibration level of the profiler and its lower detection limit for dissipation rate estimates (pseudo dissipation). The test measurements gave no indication of pronounced internal profiler vibrations interfering with dissipation measurements. The pseudo dissipation level (noise) of the profiler was found to be as low as 5.10/sup -12/ W/kg under quiet conditions at sinking velocities below 0.4 m/s. At 0.8 m/s sinking velocity, a pseudo dissipation of 4.10/sup -11/ W/kg was obtained. At rising measurements with additional sources of profiler vibrations the pseudo dissipation is about twice that for sinking measurements. The upper detection limit was estimated based on the geometry of the shear sensor. Dissipation rates up to 10/sup -4/ W/kg can be measured without correction for unresolved variance of the shear spectrum.