%0 Journal Article
%T Discrete wavelet analysis of the influence of the North Atlantic Oscillation on Baltic Sea level
%A A. Bastos
%A R. M. Trigo
%A S. M. Barbosa
%J Tellus A
%D 2013
%I Co-Action Publishing
%R 10.3402/tellusa.v65i0.20077
%X 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.
%K Baltic Sea
%K NAO
%K Discrete wavelet analysis
%K MSL
%K Wavelet correlation
%U http://www.tellusa.net/index.php/tellusa/article/view/20077/pdf_1