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Carbonate chemistry from laboratory incubation experiments using water samples from the Elbe conducted in 2023

This dataset comprises key carbonate chemistry parameters measured and calculated in incubation experiments under different experimental conditions. pH, water temperature, and salinity were measured with a WTW multimeter (MultiLine® Multi 3630 IDS). Total alkalinity was determined by open-cell titration with an 888 Titrando (Metrohm). Saturation state of calcite and aragonite were calculated using phreeqpython, a Python wrapper of the PhreeqC engine (Vitens 2021) with pH, water temperature, total alkalinity, and major ions as major input, and phreeqc.dat as database for the thermodynamic data (Parkhurst and Appelo 2013). As the original Elbe water was supersaturated with carbon dioxide (CO2) with respect to the atmosphere, its partial pressure of CO2 (pCO2) level decreased during the incubation period with open flasks, which caused an adjustment of calcite saturation state (ΩC) for ambient air conditions. To adapt for the impact of pCO2 variations during the experiment, saturation state of calcite and aragonite was calculated assuming an equilibrium with an atmospheric pCO2 of 415 ppm (normalized ΩC and normalized aragonite sautration state ΩA). Since ion concentrations were measured for only a small number of samples, the ion concentrations of the remaining samples were reconstructed using stoichiometry based on the initial solution composition and total alkalinity. The concentrations of conservative ions (Na+, K+, Cl-, SO42-) were assumed remain constant, while ions related to carbonate precipitation (Ca2+, Mg2+) were calculated based on changes in measured alkalinity (see Figure 5 of the associated paper). Detailed analysis and calculation procedures are described in the Method section of the associated paper.

Element concentrations from two benthic chambers and the ambient bottom water during an in-situ incubation experiment in July 2025

The dataset contains major and trace element concentrations measured by inductively coupled plasma optical emission spectrometry (ICP-OES) from water samples collected during a 16-day in-situ incubation experiment in the Baltic Sea (2025-07-12 to 2025-07-29). Samples were collected using an automated glass-syringe sampler deployed within two benthic chambers of a Biogeochemical Observatory (BIGO, Sommer et al., 2009) at 54° 34.432' N, 10° 10.776' E, at 22 m water depth. In one chamber, 29 g of fine calcite powder were added to the bottom water to assess the potential of enhanced benthic calcite weathering as an ocean alkalinity enhancement (OAE) strategy. Seven samples per chamber and from the ambient bottom water were analyzed to trace elemental changes associated with calcite dissolution.

Carbonate chemistry and river discharge dataset for the Elbe from incubation experiments and historical data records

This dataset provides carbonate chemistry and hydrological measurements supporting the analysis of the stability of alkalinity and carbon transport potential in the Elbe Estuary, northern Germany. It includes (1) results from laboratory incubation experiments using water samples from the Elbe conducted in 2023, (2) historical water chemistry monitoring records from multiple stations, and (3) monthly flow discharge measurements from the Neu Darchau gauging station. Experimental data were collected from the experiments varying salinity and seasonal conditions, and parameters measured include pH, temperature, and total alkalinity. Major ion concentrations (Na+, K+, Ca2+, Mg2+, Cl-, SO42-) were reconstructed from stoichiometry. The saturation states of calcite and aragonite, as well as pCO2, were calculated using the phreeqpython geochemical package. Historical data, covering carbonate chemistry and major ions at several stations and over multiple years, were collected from digitized sources and FGG Elbe. Together, this dataset facilitates the investigation of long-term trends in the carbonate system and carbon transport in the land ocean transition zone of the Elbe River.

Innovative Ansätze zur Verbesserung des Kohlenstoffspeicherpotenzials von Vegetationsküstenökosystemen, Vorhaben: Treibhausgas-Dynamik von Küstenökosystemen

Innovative Ansätze zur Verbesserung des Kohlenstoffspeicherpotenzials von Vegetationsküstenökosystemen, Leitantrag; Vorhaben: Zeitliche Entwicklung des partikulären organischen Materials (wieder)angesiedelter Küstenökosysteme

CO2-Entnahme durch Alkalinitätserhöhung - Potenzial, Nutzen und Risiken, Vorhaben: Alkalinitätserhöhung im offenen Ozean

CO2-Entnahme durch Alkalinitätserhöhung - Potenzial, Nutzen und Risiken, Leitantrag;' Vorhaben: Benthische Prozessstudien und globale Modellierung von Alkalinisierung'

Klimaforschungsplan KLIFOPLAN, Instrumente und Governance für den Hochlauf von Negativemissionen in Deutschland

Das Bundes-Klimaschutzgesetz (KSG) sieht in §3a Ziele für die natürliche Senke vor. Mit der KSG-Novelle 2024 werden in §3b die technischen Senken als Ergänzung genannt. Die Langfristnegativemissionsstrategie (LNe) soll Ziele für die technischen Senken für die Jahre 2035, 2040, 2045 und 2060 erarbeiten, welche Basis einer Verordnung darstellt. Im Anschluss wird es darum gehen, entsprechend umweltintegre Anreizsysteme und den Wettbewerb von umweltfreundlichen Senken zu adressieren. Ziel des Vorhaben ist es, konkrete Förderinstrumente für den breiten Markthochlauf von CO2-Entnahmtechnologien in Deutschland zu entwickeln, abzuwägen und zu vergleichen. Der Fokus liegt auf der Phase des Markthochlaufs, nachdem erste Förderungen angelaufen sind. Es geht darum, existierenden Negativemissionstechnologien zur Marktreife zu verhelfen und ausreichende Mengen von CO2-Entnahmen zur nationalen Zielerreichung unter Beachtung ökologischer, sozialer und ökonomischer Kriterien bereitzustellen und zu nutzen.

Innovative Ansätze zur Verbesserung des Kohlenstoffspeicherpotenzials von Vegetationsküstenökosystemen, Vorhaben: Angewandte Pflanzenökologie und integrative Geographie

Nutrient concentrations from two benthic chambers and the ambient bottom water during an in-situ incubation experiment in July 2025

The dataset contains dissolved nutrient concentrations from water samples collected during a 16-day in-situ incubation experiment in the Baltic Sea (2025-07-12 to 2025-07-29). Samples were collected using an automated glass-syringe sampler deployed within two benthic chambers of a Biogeochemical Observatory (BIGO, Sommer et al., 2009) at 54° 34.432' N, 10° 10.776' E, at 22 m water depth. In one chamber, 29 g of fine calcite powder were added to the bottom water as part of an enhanced benthic calcite weathering experiment. Seven samples per chamber and from the ambient bottom water were analyzed to assess potential nutrient fluxes associated with the calcite addition and benthic biogeochemical processes.

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