Water Depth Dependence of Long‐Range Correlation in Nontidal Variations in Seafloor Pressure

Water Depth Dependence of Long‐Range Correlation in Nontidal Variations in Seafloor Pressure
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海底压力非潮汐变化的长程相关性的水深依赖性

DOI:
10.1029/2020gl092173
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发表时间:
2021
影响因子:
5.2
通讯作者:
Hino Ryota
Hino Ryota
中科院分区:
地球科学1区
文献类型:
--
作者:
Inoue Tomohiro;Ito Yoshihiro;Wallace Laura M.;Yoshikawa Yutaka;Inazu Daisuke;Garcia Emmanuel Soliman M.;Muramoto Tomoya;Webb Spahr C.;Ohta Kazuaki;Suzuki Syuichi;Hino Ryota

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隔离海底压力数据中的非潮汐海洋噪声源对于改善这些数据在海底大地测量应用中的使用至关重要。附近底部压力记录之间的残差通常用于去除非潮汐成分,因为这些成分很大程度上是共模的。为了评估在一定水深范围内观测到的底部压力记录对之间的相似性,我们计算了安装在新西兰近海希库朗伊俯冲带的所有站点对的数据之间残差时间序列的标准偏差。我们发现标准偏差的大小更多地取决于相对水深而不是站点之间的距离。这证实了卡斯卡迪亚先前的研究结果,即即使站点之间的距离很大,非潮汐分量沿等深线也更加相似。此外,为了减少噪声,站点对之间所需的深度差也随着站点深度而变化。
Isolating the source of nontidal oceanographic noise in seafloor pressure data is critical for improving the use of these data for seafloor geodetic applications. Residuals between nearby bottom pressure records have typically been used to remove the nontidal components, as these are largely common‐mode. To evaluate the similarities between pairs of observed bottom pressure records at a range of water depths, we calculate the standard deviations of the time series of residuals between data from all site pairs, installed in the Hikurangi subduction zone offshore New Zealand. We find that the magnitude of the standard deviation depends more on relative water depth than the distance between sites. This confirms the result of previous studies from Cascadia that nontidal components are more similar along isobaths even if the distance between sites is large. Furthermore, in order to reduce noises, the required depth difference between site pairs also varies with site depths.
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