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Seasonal to decadal forcing of high water level percentiles in the German Bight throughout the last century

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Abstract

For the purpose of coastal planning and management, especially under changing climatic conditions, enhanced knowledge about the evolution of extreme sea levels in the past, present, and future is required. This paper presents statistical analyses of high seasonal water level percentiles of 13 tide gauges in the German Bight, spanning over a period of up to 109 years throughout the twentieth and twenty-first centuries. Seasonal and annual high percentile time series of water levels were investigated in comparison to the mean sea level (MSL) for changes on seasonal, inter-annual, and decadal timescales. While throughout the first half of the twentieth century extreme water levels generally followed changes in MSL, during the second half of the century, linear extreme sea level trends exceeded those in MSL in the order of 9–64 cm per century. The largest, although insignificant, contribution to the magnitude of these trends occurs in the winter season (January to March), while smaller but, due to the generally lower atmospheric variability, significant changes are observed during spring (April to June). The observed multi-decadal trends are generally in good agreement with multi-decadal trends in the corresponding percentiles of local zonal surface winds. Only small parts of the trends remain unexplained. It is suggested that these remaining trends result from modifications in the local tidal regime. For the aspects of coastal planning, the findings clarify that in the German Bight, in addition to changes in MSL, potential changes in storminess and in the tidal regime significantly contribute to the development of extreme water levels. Since these factors have influenced the characteristic of extremes throughout the recent past, they also have to be taken into account when estimating design water levels for, e.g., dikes (in a warming climate) under changing greenhouse gas emissions.

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Acknowledgments

This study was done within the KLIWAS cooperation. KLIWAS is a research program of the German Federal Ministry of Transport, Building and Urban Development (BMVBS). We highly acknowledge our colleagues Birgit Klein, Katharina Bülow, Gudrun Rosenhagen, Jens Möller, and Birger Tinz for the fruitful discussions. We are further grateful to the comments of one anonymous reviewer.

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Correspondence to Sönke Dangendorf.

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Responsible Editor: Birgit Andrea Klein

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Dangendorf, S., Mudersbach, C., Jensen, J. et al. Seasonal to decadal forcing of high water level percentiles in the German Bight throughout the last century. Ocean Dynamics 63, 533–548 (2013). https://doi.org/10.1007/s10236-013-0614-4

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