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Time series analysis of sea-level records: characterising long-term variability. (English) Zbl 1149.86309

Donner, Reik V. (ed.) et al., Nonlinear time series analysis in the geosciences. Applications in climatology, geodynamics and solar-terrestrial physics. Selected papers based on the presentations at the session on ‘Application of nonlinear times series analysis in geoscience’, Vienna, Austria, April 15–20, 2007. Berlin: Springer (ISBN 978-3-540-78937-6/hbk). Lecture Notes in Earth Sciences 112, 157-173 (2008).
Summary: The characterisation and quantification of long-term sea-level variability is of considerable interest in a climate change context. Long time series from coastal tide gauges are particularly appropriate for this purpose. Long-term variability in tide gauge records is usually expressed through the linear slope resulting from the fit of a linear model to the time series, thus assuming that the generating process is deterministic with a short memory component. However, this assumption needs to be tested, since trend features can also be due to non-deterministic processes such as random walk or long range dependent processes, or even be driven by a combination of deterministic and stochastic processes. Specific methodology is therefore required to distinguish between a deterministic trend and stochastically-driven trend-like features in a time series. In this chapter, long-term sea-level variability is characterised through the application of (i) parametric statistical tests for stationarity, (ii) wavelet analysis for assessing scaling features, and (iii) generalised least squares for estimating deterministic trends. The results presented here for long tide gauge records in the North Atlantic show, despite some local coherency, profound differences in terms of the low frequency structure of these sea-level time series. These differences suggest that the long-term variations are reflecting mainly local/regional phenomena.
For the entire collection see [Zbl 1144.86002].

MSC:

86A32 Geostatistics

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