Wave climate and long-term changes for the Southern North Sea obtained from a high-resolution hindcast 1958–2002 |
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Authors: | Ralf Weisse Heinz Günther |
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Institution: | (1) Institute for Coastal Research, GKSS Research Center, Max-Planck-Str. 1, 21502 Geesthacht, Germany |
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Abstract: | An analysis of the extreme wave conditions in 1958–2002 in the North Sea as obtained from a regional model hindcast is presented.
The model was driven by hourly wind fields obtained from a regional atmosphere model forced with reanalysis data from the
National Center for Environmental Prediction (NCEP/NCAR). Furthermore, observed sea ice conditions from the Norwegian Meteorological
Institute have been accounted for in the simulation. It is shown that the model is capable of reproducing extreme wave height
statistics at a reasonable degree of approximation. The analysis of severe wave height events reveals that for much of the
Southern North Sea, their number has increased since the beginning of the simulation period (1958), although the increase
has attenuated later and leveled off around about 1985. On the other hand, the intensity and duration of severe wave height
events decreased within the last few years of the simulation so that annual 99%-ile wave heights have also reduced since about
1990–1995. For the UK North Sea coast, a different behavior was found characterized by a reduction in severe wave conditions
over much of the hindcast period. |
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Keywords: | Waves Wave climate Sea state Long-term changes Climate variability North Sea |
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