Articles | Volume 8, issue 1
Earth Surf. Dynam., 8, 1–15, 2020
https://doi.org/10.5194/esurf-8-1-2020
Earth Surf. Dynam., 8, 1–15, 2020
https://doi.org/10.5194/esurf-8-1-2020
Research article
03 Jan 2020
Research article | 03 Jan 2020

Potential links between Baltic Sea submarine terraces and groundwater seeping

Martin Jakobsson et al.

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Cited articles

Alling, V., Humborg, C., Mörth, C.-M., Rahm, L., and Pollehne, F.: Tracing terrestrial organic matter by δ34S and δ13C signatures in a subarctic estuary, Limnol. Oceanogr., 53, 2594–2602, https://doi.org/10.4319/lo.2008.53.6.2594, 2008. 
Andrén, T., Lindeberg, G., and Andrén, E.: Evidence of the final drainage of the Baltic Ice Lake and the brackish phase of the Yoldia Sea in glacial varves from the Baltic Sea, Boreas, 31, 226–238, https://doi.org/10.1111/j.1502-3885.2002.tb01069.x, 2002. 
Andrén, T., Björck, S., Andrén, E., Conley, D., Zillén, L., and Anjar, J.: The Development of the Baltic Sea Basin During the Last 130 ka, in: The Baltic Sea Basin, edited by: Harff, J., Björck, S., and Hoth, P., Springer, Berlin, Heidelberg, 75–97, 2011. 
Andrén, T., Barker Jørgensen, B., Cotterill, C., Green, S., and IODP expedition 347 scientific party: IODP expedition 347: Baltic Sea basin paleoenvironment and biosphere, Sci. Dril., 20, 1–12, https://doi.org/10.5194/sd-20-1-2015, 2015. 
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Short summary
We studied coastal sea floor terraces in parts of the Baltic Sea using various types of sonar data, sediment cores, and video. Terraces (~1 m high, > 100 m long) are widespread in depths < 15 m and are formed in glacial clay. Our study supports an origin from groundwater flow through silty layers, undermining overlying layers when discharged at the sea floor. Submarine groundwater discharge like this may be a significant source of freshwater to the Baltic Sea that needs to be studied further.