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Ocean Dynamics

, Volume 63, Issue 2–3, pp 209–224 | Cite as

Characteristics of intra-, inter-annual and decadal sea-level variability and the role of meteorological forcing: the long record of Cuxhaven

  • Sönke Dangendorf
  • Christoph Mudersbach
  • Thomas Wahl
  • Jürgen Jensen
Article

Abstract

This paper addresses the role of meteorological forcing on mean sea level (MSL) variability at the tide gauge of Cuxhaven over a period from 1871 to 2008. It is found that seasonal sea level differs significantly from annual means in both variability and trends. The causes for the observed differences are investigated by comparing to changes in wind stress, sea level pressure and precipitation. Stepwise regression is used to estimate the contribution of the different forcing factors to sea level variability. The model validation and sensitivity analyses showed that a robust and timely independent estimation of regression coefficients becomes possible if at least 60 to 80 years of data are available. Depending on the season, the models are able to explain between 54 % (spring, April to June) and 90 % (winter, January to March) of the observed variability. Most parts of the observed variability are attributed to changes in zonal wind stress, whereby the contribution of sea level pressure, precipitation and meridional wind stress is rather small but still significant. On decadal timescales, the explanatory power of local meteorological forcing is considerable weaker, suggesting that the remaining variability is attributed to remote forcing over the North Atlantic. Although meteorological forcing contributes to linear trends in some sub-periods of seasonal time series, the annual long-term trend is less affected. However, the uncertainties of trend estimation can be considerably reduced, when removing the meteorological influences. A standard error smaller than 0.5 mm/year requires 55 years of data when using observed MSL at Cuxhaven tide gauge. In contrast, a similar standard error in the meteorologically corrected residuals is reached after 32 years.

Keywords

Mean sea level variability German Bight Meteorological forcing Sea level rise 

Notes

Acknowledgements

This study is based on investigations, which have been partially made in the framework of the KLIWAS research project. Therefore, we highly acknowledge Anette Ganske, Hartmut Heinrich, Sylvin Müller Navarra, Birgit Klein and Jens Möller from the BSH and Gudrun Rosenhagen, Birger Tinz and Katharina Bülow from the German Weather Service (DWD) for the fruitful discussions and the funding of the project. We are thankful to two anonymous reviewers who helped to improve an earlier version of the manuscript. We are further grateful to the Waterways and Shipping Administration of the Federal Government for providing us the tide gauge data.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Sönke Dangendorf
    • 1
  • Christoph Mudersbach
    • 1
  • Thomas Wahl
    • 1
    • 2
  • Jürgen Jensen
    • 1
  1. 1.Research Institute for Water and Environment (fwu)University of SiegenSiegenGermany
  2. 2.Institute of Advanced Studies, Research Group of Civil SecurityUniversity of SiegenSiegenGermany

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