Abstract This study aims at investigating the intradecadal and decadal signals of the sea level using 25 years of altimetry data around Australia. We have used the multivariable spectral analysis to extract six periodic signals at the 95% confidence level from altimetry-derived sea-level time series in the study area. They are signals with periods of 1, 1.5, 3, 4.3, 5.7 and 11.17 years, which can also be detected in the estimated power spectra from climate indices of the Interdecadal Pacific Oscillation, Multivariate ENSO Index, and Pacific Decadal Oscillation. A parametric model including the detected periodic signals is used to estimate sea-level trends. The determined trends in the area are in a good agreement with recent studies that consider effects of climate indices through a multivariate regression model. The advantage of our model is to present more descriptive explanation of the sea level signals around Australia in terms of periodicity and spatial variability.

中文翻译：

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澳大利亚周边海平面变化及其与气候指数的关系

摘要 本研究旨在利用澳大利亚 25 年的高度测量数据调查海平面的年代际和年代际信号。我们使用多变量谱分析从研究区域的测高推导的海平面时间序列中提取了 95% 置信水平的六个周期信号。它们是周期为 1、1.5、3、4.3、5.7 和 11.17 年的信号，也可以在来自年代际太平洋涛动、多元 ENSO 指数和太平洋年代际涛动的气候指数的估计功率谱中检测到。包括检测到的周期信号的参数模型用于估计海平面趋势。该地区确定的趋势与最近通过多元回归模型考虑气候指数影响的研究非常吻合。