Time series analysis of sea-level records: Characterising long-term variability

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Barbosa, SM (Author) Other; Silva, ME (Author) FCUP; Fernandes, MJ (Author) FCUP

Journal

Title: Lecture Notes in Earth Sciences

Vol. 26

Pages: 157-173

ISSN: 0930-0317

Publisher: Springer

Indexing

ISI Web of Knowledge

Scopus - 29 Citations

Other information

Authenticus ID: P-007-MSV

DOI: 10.1007/978-3-540-78938-3_8

Abstract (EN): 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. © 2008 Springer-Verlag Berlin Heidelberg.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17