Jan Schölten

Kiel University

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P. Stoffers

Kiel University

R. Botz

Kiel University

Augusto Mangini

Heidelberg University

Michael Schubert

Helmholtz Centre for Environmental Research

Dieter Garbe‐Schönberg

Kiel University

Volker Liebetrau

GEOMAR Helmholtz Centre for Ocean Research Kiel

Michael E. Böttcher

Leibniz Institute for Baltic Sea Research

Kay Knöeller

Helmholtz Centre for Environmental Research

Jan Fietzke

GEOMAR Helmholtz Centre for Ocean Research Kiel

Matthew A. Charette

Woods Hole Oceanographic Institution

Cooperative Institutions

GEOMAR Helmholtz Centre for Ocean Research Kiel

Kiel University

Leibniz Institute for Baltic Sea Research

Centre National de la Recherche Scientifique

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

GEOMAR Technologie GmbH - GTG

International University of Monaco

University of Bremen

Woods Hole Oceanographic Institution

Clinical Research Center Kiel

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A State-Of-The-Art Perspective on the Characterization of Subterranean Estuaries at the Regional Scale

Frontiers in Earth Science (2021)

Nils Moosdorf Michael E. Böttcher Dini Adyasari Ercan Erkul Benjamin Gilfedder

Subterranean estuaries the, subsurface mixing zones of terrestrial groundwater and seawater, substantially influence solute fluxes to the oceans. Solutes brought by groundwater from land and solutes brought from the sea can undergo biogeochemical reactions. These are often mediated by microbes and controlled by reactions with coastal sediments, and determine the composition of fluids discharging from STEs (i.e., submarine groundwater discharge), which may have consequences showing in coastal ecosystems. While at the local scale (meters), processes have been intensively studied, the impact of subterranean estuary processes on solute fluxes to the coastal ocean remains poorly constrained at the regional scale (kilometers). In the present communication, we review the processes that occur in STEs, focusing mainly on fluid flow and biogeochemical transformations of nitrogen, phosphorus, carbon, sulfur and trace metals. We highlight the spatio-temporal dynamics and measurable manifestations of those processes. The objective of this contribution is to provide a perspective on how tracer studies, geophysical methods, remote sensing and hydrogeological modeling could exploit such manifestations to estimate the regional-scale impact of processes in STEs on solute fluxes to the coastal ocean.

Submarine groundwater discharge

Biogeochemical Cycle

Biogeochemistry

Temporal scales

10.3389/feart.2021.601293

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Citations (42)

Occurrence of kaolinite and mixed-layer kaolinite/smectite in hydrothermal sediments of Grimsey Graben, Tjörnes Fracture Zone (north of Iceland)

Marine Geology (2005)

Vesselin M. Dekov Jan Schölten R. Botz Dieter Garbe‐Schönberg Médard Thiry

Fracture zone

Mixed layer

10.1016/j.margeo.2004.12.004

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Citations (13)

Pelagisches System und vertikaler Partikelfluss im Herbst in der Grönländischen See, Jan Mayen Strom : POSEIDON-Reise 173,2 [POS173/2] vom 14. August bis zum 10. September 1990 ; Teilprojekt A1 und A4 des Sonderforschungsbereiches 313 der Universität Kiel = The pelagic system and vertikal particle flux during autumn in the Greenland Sea, Jan Mayen Current

Avan Antia Eduard Bauerfeind Bodo von Bodungen Moshira Hassan Christoph Humborg

Source

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Defining a biogeochemical baseline for sediments at Carbon Capture and Storage (CCS) sites: An example from the North Sea (Goldeneye)

International journal of greenhouse gas control (2021)

Andrew W. Dale Stefan Sommer Anna Lichtschlag Dirk Koopmans Matthias Haeckel

Biogeochemistry

Biogeochemical Cycle

Alkalinity

Authigenic

Total inorganic carbon

10.1016/j.ijggc.2021.103265

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Citations (13)

High-resolution uranium-series dating of Norwegian-Greenland Sea sediments: 230Th vs. δ18O stratigraphy

Marine Geology (1994)

Jan Schölten R. Botz Hanno Paetsch P. Stoffers Mara Weinelt

δ18O

Sedimentation

Norwegian

10.1016/0025-3227(94)90158-9

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Citations (15)

Carbon and alkalinity outwelling across the groundwater‐creek‐shelf continuum off Amazonian mangroves

Limnology and Oceanography Letters (2021)

Alex Cabral Thorsten Dittmar Mitchell Call Jan Schölten Carlos Eduardo de Rezende

Abstract Lateral fluxes (i.e., outwelling) of dissolved organic (DOC) and inorganic (DIC) carbon and total alkalinity were estimated using radium isotopes at the groundwater, mangrove creek, and continental shelf scales in the Amazon region. Observations of salinity and radium isotopes in the creek indicated tidally driven groundwater exchange as the main source of carbon. Radium‐derived transport rates indicate that mangrove carbon is exported out of the continental shelf on timescales of 22 ± 7 d. Bicarbonate was the main form (82% ± 11%) of total dissolved carbon in all samples, followed by DOC (13% ± 12%) and CO 2 (5% ± 4%). DIC (18.7 ± 15.7 mmol m −2 d −1 ) exceeded DOC (3.0 ± 4.1 mmol m −2 d −1 ) outwelling at all spatial scales. The interpretation of outwelling across the mangrove‐ocean continuum is related to the spatial and temporal scales investigated. At all scales, outwelling represented a major coastal carbon pathway driving bicarbonate storage in the ocean.

Alkalinity

Submarine groundwater discharge

Total inorganic carbon

Radium

Carbon fibers

10.1002/lol2.10210

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Citations (37)

Recycling of manganese from anoxic sediments in stagnant basins by seawater inflow: a study of surface sediments from the Gotland Basin, Baltic Sea

Marine Geology (2001)

Uwe Heiser Thomas Neumann Jan Schölten Doris Stüben

Rhodochrosite

Authigenic

10.1016/s0025-3227(01)00129-3

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Citations (45)

Underwater in situ measurements of radionuclides in selected submarine groundwater springs, Mediterranean Sea

Radiation Protection Dosimetry (2010)

C. Tsabaris Jan Schölten Aris Karageorgis J.- F. Comanducci Dimitris Georgopoulos

The application of the in situ measurement system 'KATERINA' for monitoring of radon progenies in submarine groundwater discharge (SGD) was investigated at different locations in the Mediterranean Sea (Chalkida, Stoupa, Korfos and Cabbé). At Chalkida and Stoupa radon progenies concentration exhibited almost constant values of 1.2±0.1 and 2.5±0.2 Bq l−1, respectively. At Korfos these activities ranged between 1.4±0.1 and 2.3±0.2 Bq l−1 exhibiting inverse relationship with salinity. At Cabbé the in situ measured data were compared with radon measurements obtained by liquid scintillation counter. The system also resolved radon progeny variations of SGD on time scales above 1 h. The radioactivity levels of radon progenies from all sites were found considerably lower (approximately 2 orders of magnitude) than the commonly accepted limits for radon in drinking water.

Submarine groundwater discharge

Liquid Scintillation Counting

10.1093/rpd/ncq190

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Citations (29)

A record of changing redox conditions in the northern Peru Basin during the Late Quaternary deduced from Mn/Fe and growth rate variations in two diagenetic manganese nodules

Earth and Planetary Science Letters (1999)

Andreas Bollhöfer Norbert Frank S. Rohloff Augusto Mangini Jan Schölten

Nodule (geology)

10.1016/s0012-821x(99)00126-0

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Citations (5)