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Journal Article

Discrete wavelet analysis of the influence of the North Atlantic Oscillation on Baltic Sea level

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Bastos, A., Trigo, R. M., & Barbosa, S. M. (2013). Discrete wavelet analysis of the influence of the North Atlantic Oscillation on Baltic Sea level. Tellus Series A-Dynamic Meteorology and Oceanography, 65(1): 20077. doi:10.3402/tellusa.v65i0.20077.

Cite as: https://hdl.handle.net/21.11116/0000-0006-9B59-8
Mean sea level (MSL) in the Baltic Sea is influenced by several factors and therefore presents a complex behaviour over a wide range of time-scales. This work performs a multi-scale analysis of MSL variability in the Baltic Sea using discrete wavelet analysis. The North Atlantic Oscillation (NAO) is well known for having a strong influence in MSL variability over the Baltic; however, the relationship between MSL and NAO at different time-scales is still little understood. In this work a comparison of MSL and NAO variability is performed for a wide range of temporal scales, uncovering distinct relationships in high-frequency and long-term temporal variability. The annual and sub-annual scales are found to account for more than 50% of the total MSL variability. The MSL annual cycle is analysed and a shift from low to high amplitude values is identified in the 1970s for most stations. MSL is found to be anti-correlated to NAO at short time-scales while on the long-term NAO and MSL appear to be positively correlated for most stations. The physical mechanisms behind these distinct relationships deserve deeper study.