Sea level in the Mediterranean Sea: seasonal adjustment and trend extraction within the framework of SSA |
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| Authors: | Mahdi Haddad Hossein Hassani Habib Taibi |
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| Institution: | 1. Division of Space Geodesy, Centre of Space Techniques, 1, Avenue de Palestine. BP 13, Arzew, Oran, Algeria
2. Bournemouth University, 89 Holdenhurst Road, Bournemouth, BH8 8EB, UK
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| Abstract: | The sea level change is a crucial indicator of our climate. The spatial sampling offered by satellite altimetry and its continuity during the past years are the major assets to provide an improved vision of the Mediterranean sea level changes. In this paper, an automatic signal extraction approach, based on Singular Spectrum Analysis (SSA), is utilized for analysis and seasonal adjustment of the Mediterranean Sea level series. This automatic approach enables us to overcome the difficulties of visual identification of trend constituents that sometimes we encounter when using the conventional SSA method. The results indicate that the Mediterranean mean sea level is dominated by several harmonic components. The annual signal is particularly strong and almost covers 73.62 % of the original sea level series variation whiles its amplitude is about 15 cm. The extracted trend also indicates that the Mediterranean main sea level has significantly been raised during the period 1993–2012 by 2.44?±?0.4 mm yr?1. As an important consequence, considering the current situation, if this trend continues, the Mediterranean Sea level will be raised about 22 cm by the end of this century, which makes a dramatic effect on several issues such as land, flora, fauna, and people activities established along the Mediterranean coastlines. |
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