THE USE OF A REGIONAL CLIMATE- AND WAVE MODEL FOR THE ASSESSMENT OF CHANGES OF THE FUTURE WAVE CLIMATE IN THE WESTERN BALTIC SEA

Norman Dreier, Peter Fröhle, Dörte Salecker, Christian Schlamkow, Xu Zhenshan

Abstract


On the basis of hourly simulated wind data from a regional circulation model (Cosmo-CLM) wave conditions from 1960 to 2100 are calculated for two realisations each of the global emission scenarios A1B and B1 using a numerical wave model for the area of the Western Baltic Sea. Comparisons of the 30 years averages of the wave conditions between the future and the past show that the changes of the average wave conditions can be directly linked to the changes of the average wind conditions. The changes of the average wave conditions and extreme wave events are characterised by high spatial and annual variability. In addition the changes depend on the time period of the comparison, the global emission scenario and the realisation of the climate model run. The bandwidth of the changes is moreover affected by the approach for the calculation of the wave conditions. A significant climate change signal of the average wave conditions is found at westerly wind exposed locations with predominant higher values of the average significant wave heights up to +10%. At easterly wind exposed locations the climate change signal is more weak and higher and lower values are possible (-5% to +5%). Regarding the future changes of the wave directions, in general more wave events from W-NW and fewer events from N-NE can be expected. Analyses of extreme wave heights with a return period of 200 years show both increasing and decreasing values (-0.5m to +0.5m). The climate change signal of the extreme wave events is, as the same for the changes of the average wave conditions, more robust at locations which are exposed to westerly winds.

Keywords


Baltic Sea; regional climate change; Cosmo-CLM; SWAN wave model; extreme wave conditions

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References


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DOI: https://doi.org/10.9753/icce.v34.management.28