根据欧拉海洋温度观测的埃里森和索普尺度的比较
Comparison of Ellison and Thorpe scales from Eulerian ocean temperature observations
摘要：
海洋湍流耗散率的估计，无论是通过微观结构剪切测量，或通过重新排序的密度垂直剖面。后一种技术导致索普尺度的估计，这反过来又可以用来获得平均湍流耗散率通过比较索普尺度Ozmidov尺度。在这两种情况下，湍流耗散率可以使用船载仪器的单个垂直剖面来估计。我们在这里提出了一种替代方法来估计的长度规模的翻转使用埃里森长度尺度。埃里森尺度是由停泊的仪器测量的内部波段以外的温度变化估计的。我们应用该方法部署在约瑟芬海山（东北大西洋）周围的不同位置，在一个区域的底部强化湍流的两个系泊的高分辨率温度数据。温度时间序列的方差刚好在内波频带以上，与索普尺度有很好的相关性。该方法是基于方差的时频分解，称为“最大重叠离散小波变换”。结果表明，在时间分辨率足够高的情况下，Ellison长度尺度可以作为Thorpe尺度的一个可行替代方案，用于间接估算海洋中系泊仪器的湍流耗散率。我们认为，精细结构污染的温度测量可以提供可靠的信息湍流强度。
英文摘要：
Ocean turbulence dissipation rate is estimated either by means of microstructure shear measurements, or by adiabatically reordering vertical profiles of density. The latter technique leads to the estimate of the Thorpe scale, which in turn can be used to obtain average turbulence dissipation rate by comparing the Thorpe scale to the Ozmidov scale. In both cases, the turbulence dissipation rate can be estimated using single vertical profiles from shipborne instrumentation. We present here an alternative method to estimate the length scale of overturns by using the Ellison length scale. The Ellison scale is estimated from temperature variance just beyond the internal wave band, measured by moored instruments. We apply the method to high resolution temperature data from two moorings deployed at different locations around the Josephine seamount (North Eastern Atlantic Ocean), in a region of bottom-intensified turbulence. The variance of the temperature time series just above the internal wave frequency band is well correlated with the Thorpe scale. The method is based on the time--frequency decomposition of variance called "maximum overlap discrete wavelet transform". The results show that the Ellison length scale can be a viable alternative to the Thorpe scale for indirectly estimating turbulence dissipation rate from moored instruments in the ocean if time resolution is sufficiently high. We suggest that fine structure contaminated temperature measurements can provide reliable information on turbulence intensity.
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