Large scale hydrogeochemical and isotopic observations in the Baltic Sea system
We report hydrogeochemical and isotopic observations across the Baltic Sea from two research expeditions: (1) a ~5000 km cruise-track onboard the R/V Skagerak in 2023 and (2) a land-based sampling for terrestrial endmembers in 2024. The ship-based observations include continuous monitoring of hydrographic parameters, pH, and <sup>222</sup>Rn in surface water. In addition, we collected 542 discrete samples from the water column, vertical profiles (n = 69 stations), and meteorological data. Land observations include discrete samples from beach groundwater (n = 77), nearshore surface water (n = 47), and rivers close to the coastline (n = 46). Discrete samples were analyzed for short-lived radium isotopes, nutrients, dissolved organic and inorganic carbon, total dissolved nitrogen, total alkalinity, methane, and stable isotopes (δ<sup>18</sup>O<sub>H2O</sub>, δ<sup>2</sup>H<sub>H2O</sub>, δ<sup>13</sup>C<sub>DIC</sub>, δ<sup>13</sup>C<sub>CO2</sub>, δ<sup>13</sup>C<sub>CH4</sub>). Data products include seven open-access files. This dataset forms the deposit for upcoming original research publications. This dataset will also be valuable to researchers interested in the hydrogeochemistry of coastal seas, like the Baltic Sea, and more generally interested in submarine groundwater discharge and estuarine biogeochemistry.
Authors
- Yvonne Y. Y. Yau (ORCID: https://orcid.org/0000-0002-4692-751X)
- Stefano Bonaglia (ORCID: https://orcid.org/0000-0003-4366-0677)
- Iris Schmiedinger
- Mats Tysklind (ORCID: https://orcid.org/0000-0001-8709-6970)
- Beata Szymczycha (ORCID: https://orcid.org/0000-0002-5815-215X)
- Claudia Majtényi‐Hill (ORCID: https://orcid.org/0000-0003-2283-843X)
- Thorsten Dittmar (ORCID: https://orcid.org/0000-0002-3462-0107)
- Nico Mitschke (ORCID: https://orcid.org/0000-0002-1043-7199)
- Tobia Politi (ORCID: https://orcid.org/0000-0001-6894-4284)
- Pedro A. Inostroza (ORCID: https://orcid.org/0000-0001-7399-8308)
- Gregor Rehder (ORCID: https://orcid.org/0000-0002-0597-9989)
- Linnea Henriksson (ORCID: https://orcid.org/0009-0008-5186-0293)
- Luiz C. Cotovicz (ORCID: https://orcid.org/0000-0002-3914-8155)
- Isaac R. Santos (ORCID: https://orcid.org/0000-0003-0524-842X)
- Michael E. Böttcher (ORCID: https://orcid.org/0000-0002-8877-0303)
- Tristan McKenzie (ORCID: https://orcid.org/0000-0003-4656-439X)
- Ana Tronholm (ORCID: https://orcid.org/0000-0002-0151-2804)
- Júlia Rodríguez-Puig (ORCID: https://orcid.org/0000-0002-9648-290X)
- Gloria Reithmaier (ORCID: https://orcid.org/0000-0002-9220-3651)
- Per Hall (ORCID: https://orcid.org/0000-0002-4326-9355)
- Jannine M. Lencina‐Avila (ORCID: https://orcid.org/0000-0001-5800-2760)
- Ceylena Holloway (ORCID: https://orcid.org/0000-0002-7899-918X)
- Adam Ulfsbo (ORCID: https://orcid.org/0000-0001-7550-7381)
- Henry L. S. Cheung (ORCID: https://orcid.org/0000-0002-5383-846X)
- Aprajita S. Tomer (ORCID: https://orcid.org/0009-0000-2311-0454)
- Wilma Ljungberg (ORCID: https://orcid.org/0009-0009-5464-7807)
- Shibin Zhao (ORCID: https://orcid.org/0000-0001-5143-8481)
- Solveig Börjesson
- Tibaud Cardis (ORCID: https://orcid.org/0009-0003-1572-2102)
- Nicolai Verbücheln (ORCID: https://orcid.org/0009-0003-7017-9413)
- Linda Zetterholm (ORCID: https://orcid.org/0009-0003-8288-9383)
Institutions
- Universitat Autònoma de Barcelona (ES)
- Carl von Ossietzky Universität Oldenburg (DE)
- Stockholm University (SE)
- Leibniz Institute for Baltic Sea Research Warnemünde (DE)
- Universität Greifswald (DE)
- Helmholtz Institute for Functional Marine Biodiversity (DE)
- Instytut Oceanologii Polskiej Akademii Nauk (PL)
- University of Rostock (DE)
- Universidade Federal do Paraná (BR)
- Ocean University of China (CN)
- Southern Cross University (AU)
- University of Gothenburg (SE)
- RWTH Aachen University (DE)
- Umeå University (SE)
- Polish Academy of Sciences (PL)
Publication Details
- Journal
- Scientific Data
- Published
- 2025-11-06
- DOI
- https://doi.org/10.1038/s41597-025-06217-9
- Primary Topic
- Groundwater and Isotope Geochemistry
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Göteborgs Universitet