Revisiting Microstructure Sensor Responses with Implications for Double-Diffusive Fluxes
Revisiting Microstructure Sensor Responses with Implications for Double-Diffusive Fluxes
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DOI：
10.1175/jtech-d-12-00272.1
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发表时间：
2013-08
影响因子：
2.2
通讯作者：
T. Sommer;J. Carpenter;M. Schmid;R. Lueck;A. Wüest
中科院分区：
文献类型：
--
作者：
T. Sommer;J. Carpenter;M. Schmid;R. Lueck;A. Wüest
利用双扩散阶梯中自然存在的薄的高梯度界面来估计温度和电导率微结构传感器的响应特性。这些响应的知识是必不可少的resolvingsmall-scaleberencein自然水体，并确定双扩散通量的热量和盐。在这里，作者得出微观结构传感器的反应，从观察到的差异界面厚度的统计分布在基伍湖（中非）在不同的剖析速度。与用于确定传感器响应的标准方法相比，该方法独立于真实的原位温度和盐度结构的任何知识。假设双极点频率响应函数，Sea-Bird Electronics SBE-7电导率传感器和罗克兰Scientific International FP 07热敏电阻的时间常数估计分别为2.2和10 ms。与先前的假设相反，发现SBE-7的频率响应很大，并且在剖面速度大于0.19ms 21时主导波数响应。
Thinhigh-gradientinterfacesthatoccurnaturallywithindouble-diffusivestaircasesareusedtoestimatethe response characteristics of temperature and conductivity microstructure sensors. The knowledge of these responses is essentialfor resolvingsmall-scaleturbulencein natural waterbodies and for determining doublediffusive fluxes of heat and salt. Here, the authors derive microstructure sensor responses from observed differences in the statistical distributions of interface thicknesses at various profiling speeds in Lake Kivu (central Africa). In contrast to the standard approach for determining sensor responses, this method is independent of any knowledge of the true in situ temperature and salinity structure. Assuming double-pole frequency response functions, the time constants for the Sea-Bird Electronics SBE-7 conductivity sensor and the Rockland Scientific International FP07 thermistor are estimated to be 2.2 and 10ms, respectively. In contrast to previous assumptions, the frequency response for the SBE-7 is found to be substantial and dominates the wavenumber response for profiling speeds larger than 0.19ms 21 .