Untangling the waves: decomposing extreme sea levels in a non-tidal basin, the Baltic Sea

Lorenz, Marvin; Viigand, Katri; Gräwe, Ulf

doi:https://doi.org/10.5194/nhess-25-1439-2025

Articles | Volume 25, issue 4

https://doi.org/10.5194/nhess-25-1439-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/nhess-25-1439-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 4

Research article

|

15 Apr 2025

Research article |

| 15 Apr 2025

Untangling the waves: decomposing extreme sea levels in a non-tidal basin, the Baltic Sea

Marvin Lorenz, Katri Viigand, and Ulf Gräwe

Data sets

Results of the study "Untangling the Waves: Decomposing Extreme Sea Levels in a non-tidal basin, the Baltic Sea" Marvin Lorenz and Ulf Gräwe https://doi.org/10.5281/zenodo.13903909

Model code and software

Results of the study "Uncertainties and discrepancies in the representation of recent storm surges in a non-tidal semi-enclosed basin: a hind-cast ensemble for the Baltic Sea" in Ocean Science Marvin Lorenz and Ulf Gräwe https://doi.org/10.5281/zenodo.8340648

Interactive computing environment

Analysis code of the study "Untangling the Waves: Decomposing Extreme Sea Levels in a non-tidal basin, the Baltic Sea" Marvin Lorenz https://doi.org/10.5281/zenodo.14870029

Short summary

This study divides the sea level components that contribute to extreme sea levels in the Baltic Sea into three parts: the filling state of the Baltic Sea, seiches, and storm surges. In the western part of the Baltic Sea, storm surges are the main factor, while in the central and northern parts, the filling state plays a larger role. Using a numerical model, we show that wind and air pressure are the main drivers of these events, with Atlantic sea level also playing a small role.