Articles | Volume 6-osr9
https://doi.org/10.5194/sp-6-osr9-6-2025
https://doi.org/10.5194/sp-6-osr9-6-2025
30 Sep 2025
 | OSR9 | Chapter 2.3
 | 30 Sep 2025 | OSR9 | Chapter 2.3

A new conceptual framework for assessing the physical state of the Baltic Sea

Urmas Raudsepp, Ilja Maljutenko, Priidik Lagemaa, and Karina von Schuckmann

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Record low sea levels in the Bothnian Bay in November 2024
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Cited articles

Barzandeh, A., Maljutenko, I., Rikka, S., Lagemaa, Männik, A., P., Uiboupin, R., and Raudsepp, U.: Sea surface circulation in the Baltic Sea: decomposed components and pattern recognition, Sci. Rep., 14, 18649, https://doi.org/10.1038/s41598-024-69463-8, 2024. 
Bashiri, B., Barzandeh, A., Männik, A., and Raudsepp, U.: Variability of marine heatwaves´ characteristics and assessment of their potential drivers in the Baltic Sea over the last 42 years, Sci. Rep., 14, 22419, https://doi.org/10.1038/s41598-024-74173-2, 2024. 
Bindoff, N. L., Cheung, W. W. L., Kairo, J. G., Arístegui, J., Guinder, V. A., Hallberg, R., Hilmi, N., Jiao, N., Karim, M. S., Levin, L., O’Donoghue, S., Purca Cuicapusa, S. R., Rinkevich, B., Suga, T., Tagliabue, A., and Williamson, P.: Changing Ocean, Marine Ecosystems, and Dependent Communities, in: IPCC Special Report on the Ocean and Cryosphere in a Changing Climate, edited by: Pörtner, H.-O., Roberts, D. C., Masson-Delmotte, V., Zhai, P., Tignor, M., Poloczanska, E., Mintenbeck, K., Alegría, A., Nicolai, M., Okem, A., Petzold, J., Rama, B., and Weyer, N. M., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 447–587, https://doi.org/10.1017/9781009157964.007, 2019. 
Boyer, T., Levitus, S., Antonov, J., Locarnini, R., Mishonov, A., Garcia, H., and Josey, S. A.: Changes in freshwater content in the North Atlantic Ocean 1955–2006. Geophys. Res. Lett., 34, L16603, https://doi.org/10.1029/2007GL030126, 2007. 
Breiman, L.: Random forests, Mach. Learn., 45, 5–32, https://doi.org/10.1023/A:1010933404324, 2001. 
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Short summary
Over the past 3 decades, the Baltic Sea has warmed and become saltier, reflecting broader atmospheric trends. Heat content changes are mainly driven by subsurface temperature variations in the upper 100 m, influenced by air temperature, evaporation, and wind stress. Freshwater content changes are largely controlled by salinity shifts in the halocline (40–120 m), with key drivers being saline inflows, precipitation, and zonal wind stress.
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