Submarine groundwater discharge into a semi-enclosed coastal bay of the southern Baltic Sea: A multi-method approach

• Autorzy: Von Ahn Cátia Milene Ehlert , Dellwig Olaf , Szymczycha Beata , Kotwicki Lech , Rooze Jurjen , Endler Rudolf , Escher Peter , Schmiedinger Iris , Sültenfuß Jürgen , Diak Magdalena , Gehre Matthias , Struck Ulrich , Vogler Susan , Böttcher Michael Ernst

Identyfikatory

DOI

10.1016/j.oceano.2024.01.001

• Języki publikacji: EN

Abstrakty

EN

The present study aims to understand the impact of submarine groundwater discharge (SGD) on a coastal area with different lithology and degrees of SGD. Sampling campaigns took place in Puck Bay and the Gulf of Gdańsk, southern Baltic Sea encompassing years between 2009 and 2021. The methodological approach combined geophysical characterization of the surface sediments with detailed spatial and temporal (isotope) biogeochemical investigations of pore and surface waters, and was supported by nearshore groundwater and river surveys. Acoustic investigations identified areas of disturbance that may indicate zones of preferential SGD release. The composition of porewater and the differences in the bay's surface waters disclosed SGD as common phenomenon in the study area. Regional SGD was estimated through a radium mass balance. Local estimation of SGD, based on porewater profiles, revealed highest SGD fluxes at the sandy shoreline, but relatively low elemental fluxes. Though SGD was low at the muddy sites corresponding elemental fluxes of nutrients and dissolved carbon exceeded those determined at the sandy sites due to intense diagenesis in the top sediments. SGD appears to be sourced from different freshwater endmembers; however, diagenesis in surface sediments substantially modified the composition of the mixed solutions that are finally discharged to coastal waters. Overall, this study provides a better understanding of the SGD dynamics in the region by a multi-approach and emphasizes the need to understand the processes occurring at the sediment-water interface when estimating SGD.

Słowa kluczowe

EN

stable isotopes; radium isotopes; acoustic survey; diagenesis; Gulf of Gdańsk; Puck Bay

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2024
• Tom: Vol. 66 (1)
• Strony: 111--138
• Opis fizyczny: Bibliogr.

Twórcy

autor

Von Ahn Cátia Milene Ehlert

• Geochemistry & Isotope Biogeochemistry, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany

autor

Dellwig Olaf

• Geochemistry & Isotope Biogeochemistry, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany

autor

Szymczycha Beata

• Institute of Oceanology, Polish Academy of Sciences (IO PAN), Sopot, Poland

autor

Kotwicki Lech

• Institute of Oceanology, Polish Academy of Sciences (IO PAN), Sopot, Poland

autor

Rooze Jurjen

• Geochemistry & Isotope Biogeochemistry, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany
• Department of Physical Oceanography and Instrumentation, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany

autor

Endler Rudolf

• Marine Geophysics, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany

autor

Escher Peter

• Geochemistry & Isotope Biogeochemistry, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany
• current address: Ecoandmore Freiburg, Germany

autor

Schmiedinger Iris

• Geochemistry & Isotope Biogeochemistry, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany

autor

Sültenfuß Jürgen

• Institute of Environmental Physics, University of Bremen, Bremen, Germany

autor

Diak Magdalena

• Institute of Oceanology, Polish Academy of Sciences (IO PAN), Sopot, Poland

autor

Gehre Matthias

• Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research (UFZ), Leipzig-Halle, Germany

autor

Struck Ulrich

• Free University Museum for Natural History, Berlin, Germany

autor

Vogler Susan

• Geochemistry & Isotope Biogeochemistry, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany

autor

Böttcher Michael Ernst

• Geochemistry & Isotope Biogeochemistry, Leibniz Institute for Baltic Sea Research (IOW), Warnemünde, Germany
• Marine Geochemistry, University of Greifswald, Greifswald, Germany
• Interdisciplinary Faculty, University of Rostock, Rostock, Germany