Articles | Volume 21, issue 5
https://doi.org/10.5194/os-21-2125-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-21-2125-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 Sep 2025
Research article |
| 30 Sep 2025
| 30 Sep 2025
Currents and their drivers in the Archipelago Sea: insights from ADCP measurements
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Laura Tuomi
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Pekka Alenius
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Elina Miettunen
Finnish Environment Institute, Latokartanonkaari 11, 00790 Helsinki, Finland
Milla Johansson
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Tuomo Roine
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Antti Westerlund
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Kimmo K. Kahma
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
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We studied circulation and transports in the Archipelago Sea (in the Baltic Sea) with a high-resolution hydrodynamic model. Transport dynamics show different variabilities in the north and south, so no single transect can represent transport through the whole area in all cases. The net transport in the surface layer is southward and follows the alignment of the deeper channels. In the lower layer, the net transport is southward in the northern part of the area and northward in the southern part.
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Ralf Weisse, Inga Dailidienė, Birgit Hünicke, Kimmo Kahma, Kristine Madsen, Anders Omstedt, Kevin Parnell, Tilo Schöne, Tarmo Soomere, Wenyan Zhang, and Eduardo Zorita
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The study is part of the thematic Baltic Earth Assessment Reports – a series of review papers summarizing the knowledge around major Baltic Earth science topics. It concentrates on sea level dynamics and coastal erosion (its variability and change). Many of the driving processes are relevant in the Baltic Sea. Contributions vary over short distances and across timescales. Progress and research gaps are described in both understanding details in the region and in extending general concepts.
Jan-Victor Björkqvist, Sander Rikka, Victor Alari, Aarne Männik, Laura Tuomi, and Heidi Pettersson
Nat. Hazards Earth Syst. Sci., 20, 3593–3609, https://doi.org/10.5194/nhess-20-3593-2020, https://doi.org/10.5194/nhess-20-3593-2020, 2020
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Wave observations have a fundamental uncertainty due to the randomness of the sea state. Such scatter is absent in model data, and we tried two methods to best account for this difference when combining measured and modelled wave heights. The results were used to estimate how rare a 2019 storm in the Bothnian Sea was. Both methods were found to have strengths and weaknesses, but our best estimate was that, in the current climate, such a storm might on average repeat about once a century.
Cited articles
Ambjörn, C. and Gidhagen, L.: Vatten- och materialtransporter mellan Bottniska viken och Östersjön [Water and material transports between the Gulf of Bothnia and the Baltic Proper], Sveriges meteorologiska och hydrologiska institut (SMHI), http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-5829 (last access: 27 June 2025), 1979 (in Swedish). a, b, c
Björkqvist, J.-V., Tuomi, L., Tollman, N., Kangas, A., Pettersson, H., Marjamaa, R., Jokinen, H., and Fortelius, C.: Brief communication: Characteristic properties of extreme wave events observed in the northern Baltic Proper, Baltic Sea, Nat. Hazards Earth Syst. Sci., 17, 1653–1658, https://doi.org/10.5194/nhess-17-1653-2017, 2017. a
Book, J. W., Perkins, H., Signell, R. P., and Wimbush, M.: The Adriatic Circulation Experiment Winter 2002/2003 Mooring Data Report: A Case Study in ADCP Data Processing, Tech. rep., DTIC Document, US Naval Research Laboratory, https://apps.dtic.mil/sti/html/tr/ADA469990/ (last access: 25 September 2025), 2007. a
Chaudhari, A., Immonen, E., Manngård, M., Westö, J., and Bengs, D.: Assessing the Impact of Forests on Local Wind Conditions in Archipelagos: A CFD Study, in: Proceedings of the 37th ECMS International Conference on Modelling and Simulation, Florence, Italy, 341–349, https://doi.org/10.7148/2023-0341, 2023. a
EMODnet Bathymetry Consortium: EMODnet Digital Bathymetry (DTM 2020), EMODnet Bathymetry Consortium [data set], https://doi.org/10.12770/bb6a87dd-e579-4036-abe1-e649cea9881a, 2020. a
Green, J. M., Liljebladh, B., and Omstedt, A.: Physical oceanography and water exchange in the Northern Kvark Strait, Cont. Shelf Res., 26, 721–732, https://doi.org/10.1016/j.csr.2006.01.012, 2006. a
Hela, I.: Drift currents and permanent flow, Societas scientiarum Fennica, Societas scientiarum Fennica, Comm. Phys.-Math XVI, 1–28, 1952. a
HELCOM: PLC Subbasins, HELCOM Map and data service [data set], https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/1456f8a5-72a2-4327-8894-31287086ebb5, (last access 19 October 2022), 2018. a
Johansson, M.: Sea level changes on the Finnish coast and their relationship to atmospheric factors, Phd thesis, University of Helsinki, Helsinki, Finland, http://hdl.handle.net/10138/45229 (last access: 27 June 2025), 2014. a
Jönsson, B., Döös, K., Nycander, J., and Lundberg, P.: Standing waves in the Gulf of Finland and their relationship to the basin-wide Baltic seiches, J. Geophys. Res.-Oceans, 113, https://doi.org/10.1029/2006JC003862, 2008. a
Kanarik, H., Alenius, P., Tuomi, L., Jalli, H., Purokoski, T., Roine, T., Kosloff, P., Hietala, R., and Laakso, L.: Data in “Currents and their Drivers in the Archipelago Sea: Insights from ADCP measurements” by Kanarik et al. (2025), Finnish Meteorological Institute [data set], https://doi.org/10.57707/FMI-B2SHARE.EDC8A252CC8F4FADA0C024535C73D47D, 2025. a
Karvo, S.: Using acoustic current measurements in zooplankton research in the Baltic Sea, Master's thesis, University of Helsinki, Finland, http://hdl.handle.net/10138/565797 (last access: 27 June 2025), 2023. a
Laakso, L., Mikkonen, S., Drebs, A., Karjalainen, A., Pirinen, P., and Alenius, P.: 100 years of atmospheric and marine observations at the Finnish Utö Island in the Baltic Sea, Ocean Sci., 14, 617–632, https://doi.org/10.5194/os-14-617-2018, 2018. a
Laurila, T. K., Gregow, H., Cornér, J., and Sinclair, V. A.: Characteristics of extratropical cyclones and precursors to windstorms in northern Europe, Weather and Climate Dynamics, 2, 1111–1130, https://doi.org/10.5194/wcd-2-1111-2021, 2021a. a, b
Laurila, T. K., Sinclair, V. A., and Gregow, H.: Climatology, variability, and trends in near-surface wind speeds over the North Atlantic and Europe during 1979–2018 based on ERA5, Int. J. Climatol., 41, 2253–2278, https://doi.org/10.1002/joc.6957, 2021b. a
Lilover, M.-J.: Tidal currents as estimated from ADCP measurements in “practically non-tidal” Baltic Sea, in: 2012 IEEE/OES Baltic International Symposium (BALTIC), 1–4, https://doi.org/10.1109/BALTIC.2012.6249181, 2012. a
Lilover, M.-J., Pavelson, J., and Kõuts, T.: Wind forced currents over the shallow Naissaar Bank in the Gulf of Finland, Boreal Environ. Res., 16, 164, https://www.borenv.net/BER/archive/pdfs/ber16/ber16A-164.pdf (last access: 27 June 2025), 2011. a
Lisitzin, E.: A brief report on the scientific results of the hydrological expedition to the Archipelago and Åland Sea in the year 1922, Societas geographica Fenniae, 1951. a
Lisitzin, E.: Sea Level Changes, Elsevier Oceanography Series 8, 286 pp., 1974. a
Medvedev, I., Rabinovich, A., and Kulikov, E.: Tidal oscillations in the Baltic Sea, Oceanology, 53, 526–538, https://doi.org/10.1134/S0001437013050123, 2013. a
Miettunen, E., Tuomi, L., and Myrberg, K.: Water exchange between the inner and outer archipelago areas of the Finnish Archipelago Sea in the Baltic Sea, Ocean Dynam., 1–17, https://doi.org/10.1007/s10236-020-01407-y, 2020. a, b
Muchowski, J., Jakobsson, M., Umlauf, L., Arneborg, L., Gustafsson, B., Holtermann, P., Humborg, C., and Stranne, C.: Observations of strong turbulence and mixing impacting water exchange between two basins in the Baltic Sea, Ocean Sci., 19, 1809–1825, https://doi.org/10.5194/os-19-1809-2023, 2023. a
Männikus, R., Soomere, T., and Viška, M.: Variations in the mean, seasonal and extreme water level on the Latvian coast, the eastern Baltic Sea, during 1961–2018, Estuar. Coast. Shelf S., 245, 106827, https://doi.org/10.1016/j.ecss.2020.106827, 2020. a
Rantanen, M., van den Broek, D., Cornér, J., Sinclair, V. A., Johansson, M. M., Särkkä, J., Laurila, T. K., and Jylhä, K.: The Impact of Serial Cyclone Clustering on Extremely High Sea Levels in the Baltic Sea, Geophys. Res. Lett., 51, https://doi.org/10.1029/2023GL107203, 2024. a, b
Soomere, T. and Keevallik, S.: Anisotropy of moderate and strong winds in the Baltic Proper, Proc. Estonian Acad. Sci. Eng, 7, 35–49, https://kirj.ee/public/va_te/t50-1-3.pdf (last access: 27 June 2025), 2001. a
Suhhova, I., Liblik, T., Lilover, M.-J., and Lips, U.: A descriptive analysis of the linkage between the vertical stratification and current oscillations in the Gulf of Finland, Boreal Environ. Res., 23, 83, https://www.borenv.net/BER/archive/pdfs/ber23/ber23-083-103.pdf (last access: 27 June 2025), 2018. a
Symonds, D.: QA/QC Parameters for Acoustic Doppler Current Profilers, Teledyne RDI Application Note, Teledyne RD Instruments, San Diego, CA, USA, https://content.aodn.org.au/Documents/IMOS/Quality_control/Working_group/ADCP/Teledyne-RDI_QAQC-Parameters-for-ADCPs.pdf (last access: 25 September 2025), 2006. a
Tuomi, L., Miettunen, E., Alenius, P., and Myrberg, K.: Evaluating hydrography, circulation and transport in a coastal archipelago using a high-resolution 3D hydrodynamic model, J. Marine Syst., 180, 24–36, https://doi.org/10.1016/j.jmarsys.2017.12.006, 2018. a
Westerlund, A., Miettunen, E., Tuomi, L., and Alenius, P.: Refined estimates of water transport through the Åland Sea in the Baltic Sea, Ocean Sci., 18, 89–108, https://doi.org/10.5194/os-18-89-2022, 2022. a
Witting, R.: Untersuchungen zur Kenntnis der Wasserbewegungen und der Wasserumsetzung in den Finland umgebenden Meeren [Studies on water movements and water turnover in the seas surrounding Finland], Finnländische Hydrograpisch-Biologische Untersuchungen, 2, 173, http://urn.fi/URN:NBN:fi-fd2020-00028015 (last access: 25 September 2025), 1908 (in German). a
Witting, R.: Tidvattnen i Östersjön och Finska Viken [Tides in the Baltic Sea and the Gulf of Finland], Fennia, 29, 1–84, 1911 (in Swedish). a
Witting, R.: Zusammenfassende Übersicht der Hydrographie des bottnischen und finnischen Meerbusens und der Nördlichen Ostsee: nach den Untersuchungen bis Ende 1910 [Overview of the hydrography of the Gulf of Bothnia and the Gulf of Finland and the Northern Baltic Sea: according to the investigations up to the end of 1910], 7, https://www.doria.fi/handle/10024/171912 (last access: 27 June 2025), 1912 (in German). a, b, c
Witting, R. und Pettersson, H.: Thalassologische Beobachtungen im Ålands- und Schärenmeer im Juli 1922 and Juli 1923 [Oceanographic observations in the Åland Sea and the Archipelago Sea in July 1922 and July 1923], Merentutkimuslaitoksen julkaisu N:o 30, Helsinki, http://hdl.handle.net/10138/158820 (last access: 25 September 2025), 1925 (in German). a
Short summary
The Archipelago Sea (AS), part of the Baltic Sea off the northwest coast of Finland, is a fragmented area with intense human activity. This study presents an overview of the observed currents and their main drivers in the area. While local winds primarily drive the AS currents, simultaneous sea level variations in the Bay of Bothnia and Gulf of Finland also significantly impact the area's dynamics.
The Archipelago Sea (AS), part of the Baltic Sea off the northwest coast of Finland, is a...
