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Spectra of poorly resolved ocean data

机译:分辨率较差的海洋数据的光谱

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摘要

Standard temperature and pressure sensors on Aanderaa RCM8 current meters have a resolution of ~0.024 °C and ~0.6 bar, each equal to 1 digital number (value) over a range of 1024. It is shown that an 11-month deep-ocean temperature record using only four values can contain useful spectral information on internal wave motions. This is partially due to the modulation of high-frequency data by non-zero low-frequency (subinertial) variations. This result follows from the comparison of this record with artificial three- and four-value data constructed from temperature records observed in stronger stratified waters nearby. These artificial records show main features of the internal wave band similar to those observed in the original data spectra. Peaks at tidal harmonic frequencies and enhancements at sum-tidal-inertial interaction frequencies are preserved in the artificial data, but overall noise level (and thus the continuum spectral slope) is enhanced with respect to the properly resolved records (using 15 and 100 values). As a demonstration of the stable accuracy of the temperature sensors, the poorly resolved records provided an estimate of mean stratification to within 5% of the estimate using Seabird CTD data.
机译:Aanderaa RCM8电流表上的标准温度和压力传感器的分辨率为〜0.024°C和〜0.6 bar,分别等于1024范围内的1个数字(值)。显示出11个月的深海温度仅使用四个值的记录可以包含有关内部波动的有用频谱信息。这部分是由于非零低频(亚惯性)变化对高频数据的调制。此结果是通过将该记录与人工三值和四值数据进行比较得出的,该三值和四值数据是根据附近较强分层水中观察到的温度记录构建的。这些人工记录显示出内部波段的主要特征,类似于在原始数据频谱中观察到的特征。人工数据中保留了潮汐谐波频率处的峰值和潮汐-惯性相互作用频率处的增强,但是相对于正确解析的记录(使用15和100值),总体噪声水平(以及连续谱斜率)得到了增强。 。为了证明温度传感器具有稳定的精度,使用Seabird CTD数据,分辨率较差的记录提供的平均分层估计值不超过估计值的5%。

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