de.pangaea.dataset974077 und de.pangaea.dataset974076 dataset PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact 2026-04-30T21:03:49Z https://doi.pangaea.de/10.1594/PANGAEA.974077 <gco:CharacterString>Pore water data of laboratory incubation experiments on enhanced benthic weathering in organic rich Baltic Sea sediments</gco:CharacterString> 2025-02-11T09:07:54 publication https://doi.org/10.1594/PANGAEA.974077 Fuhr, Michael
m.drove@gmail.com
https://orcid.org/0000-0002-5169-6744 information author Wallmann, Klaus
kwallmann@geomar.de
https://orcid.org/0000-0002-1795-376X information author Dale, Andy W
adale@geomar.de
author Diercks, Isabel
idiercks@geomar.de
https://orcid.org/0009-0001-6814-8365 information author Kalapurakkal, Habeeb Thanveer
hkalapurakkal@geomar.de
author Schmidt, Mark
mschmidt@geomar.de
https://orcid.org/0000-0002-4298-9617 information author Sommer, Stefan
ssommer@geomar.de
author Böhnke-Brandt, Stefanie
sboehnke-brandt@geomar.de
https://orcid.org/0000-0002-3431-5452 information author Perner, Mirjam
mperner@geomar.de
https://orcid.org/0000-0003-1223-9310 information author Geilert, Sonja
s.geilert@uu.nl
https://orcid.org/0000-0002-8971-5867 information author PANGAEA
info@pangaea.de
https://www.pangaea.de/ information publisher tableDigital Enhanced mineral dissolution in the benthic environment is currently discussed as a potential technique for ocean alkalinity enhancement (OAE) to reduce atmospheric carbon dioxide (CO2) levels. This study explores how biogeochemical processes affect the dissolution of alkaline minerals in surface sediments during laboratory incubation experiments (January - May 2022). These involved introducing dunite and calcite to organic-rich sediments from the Baltic Sea under controlled conditions in an oxic environment. The sediment cores were incubated with Baltic Sea bottom water. Eight sediment cores were placed in a rack in an upright position. The bottom water was carefully removed via suction and replaced with a known volume (1.5 l – 2.0 l) of filtered (0.2 µm) Baltic Sea bottom water in order to remove pelagic auto- and heterotrophs and suspended particles. The volume of water added depended on the height of sediment in each core which varied slightly due to the recovery method. After this procedure, a gaseous headspace of ca. 10 cm was left in each core. Furthermore, the cores were equipped with adjustable stirring heads that contained ports for inserting optodes to continuously record pH and oxygen (O2) concentrations in the overlying water. In order to prevent anoxic conditions developing, ambient air was bubbled into the water column. The water column in each core was slowly and continuously flushed with a constant throughflow of 40 µl min-1 from a single reservoir of bottom water. The residence time of the water inside the cores was thus about 4 to 5 weeks. At the end of the experiments, the bottom water was removed via suction and the cores were sliced for pore water analysis. The pore waters were recovered by centrifuging each respective sediment layer in 50 ml falcon tubes at 3000 rpm for 10 minutes. Afterwards, the supernatant water was transferred to polyethylene (PE) vials in an Ar-filled glove bag to minimize contact with oxygen. Samples for TA were analyzed directly after sampling by titration of 1 ml of bottom/pore water with 0.02N HCl. Titration was ended when a stable purple color appeared. During titration, the sample was degassed by continuous bubbling with nitrogen to remove any generated CO2 and H2S. The acid was standardized using an IAPSO seawater standard. Anion element concentrations (SO42-, Cl-, Br-) were determined using ion chromatography (IC, METROHM 761 Compact, conductivity mode). Acidified sub-samples (30 μl suprapure HNO3- + 3 ml sample) were prepared for analyses of major and trace elements (Si, Na, K, Li, B, Mg, Ca, Sr, Mn, Ni and Fe) by inductively coupled plasma optical emission spectroscopy (ICP-OES, Varian 720-ES). In addition to the parameters listed above, pore waters were analyzed for sulfite (H2S) and Fe2+. For the analysis of dissolved Fe2+ concentrations, sub-samples of 1 ml were taken within the glove bag, immediately stabilized with ascorbic acid and analyzed within 30 minutes after complexation with 20 μl of Ferrozin. For H2S, an aliquot of pore water was diluted with appropriate amounts of oxygen-free artificial seawater and the H2S was fixed by immediate addition of zinc acetate gelatin solution. completed Geilert, Sonja
s.geilert@uu.nl
https://orcid.org/0000-0002-8971-5867 information principalInvestigator calcite dissolution dunite dissolution enhanced weathering incubation experiment Laboratory experiment theme <gco:CharacterString>PANGAEA Keyword List</gco:CharacterString> 1995-01-01 creation PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact RETAKE DAM CDRmare - RETAKE: CO2 removal by alkalinity enhancement: potential, benefits and risks CDRmare Research Mission of the German Marine Research Alliance (DAM): Marine carbon sinks in decarbonisation pathways theme <gco:CharacterString>PANGAEA Project List</gco:CharacterString> 1995-01-01 creation PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation 10.04167 10.04167 54.51667 54.51667 2022-01-13T11:30:00 2022-01-13T11:30:00 Additional information regarding the experimental set-up: * Laboratory: GEOMAR cool-lab (12.5 °C) * Treatments, added to sediment core of 10 cm diameter: Dunite (4.4781 g, manufacturer Sibelco), Calcite (7.8618 g, manufacturer unknown). * Baltic sea water sampled in Boknis Eck (Salinity: 21, Temperature: 4.2 °C) * Start of the experiments: 2022-01-14 (morning) * End of the experiments: 2022-05-07 (afternoon) Type of study thematicClassification Sample type thematicClassification Treatment thematicClassification Sample ID thematicClassification Sampling date/time, experiment thematicClassification Smartphone application, Apple, Clock [iPhone SE 2016] DEPTH, sediment, experiment physicalMeasurement Ruler stick m m Alkalinity, total physicalMeasurement Titration device, Metrohm, 775 Dosimat mmol(eq)/l mmol(eq)/l Ammonium physicalMeasurement Spectrophotometer, Hitachi, U-2001 µmol/l µmol/l Phosphate physicalMeasurement Segmented continuous flow analyzer, SEAL Analytical, QuAAtro µmol/l µmol/l Sulfide physicalMeasurement Spectrophotometer, Hitachi, U-2001 µmol/l µmol/l Iron 2+ physicalMeasurement Spectrophotometer, Hitachi, U-2001 µmol/l µmol/l Sulfate physicalMeasurement Ion chromatograph, Metrohm, Eco IC mmol/l mmol/l Bromide physicalMeasurement Ion chromatograph, Metrohm, Eco IC µmol/l µmol/l Chloride physicalMeasurement Ion chromatograph, Metrohm, Eco IC mmol/l mmol/l text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.974077?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: L22_core * LATITUDE: 54.516670 * LONGITUDE: 10.041670 * DATE/TIME: 2022-01-13T11:30:00 * ELEVATION: -27.0 m * LOCATION: Boknis Eck * CAMPAIGN: L22_daytrip * BASIS: Littorina * METHOD/DEVICE: MultiCorer, mini Original sampling location of tested surface sediments; salinity: 21; water temperature: 4.2 °C 2022-01-13T11:30:00 Supplement to <gco:CharacterString>Disentangling artificial and natural benthic weathering in organic rich Baltic Sea sediments</gco:CharacterString> 2023-01-01 publication https://doi.org/10.3389/fclim.2023.1245580 Fuhr, Michael
m.drove@gmail.com
https://orcid.org/0000-0002-5169-6744 information author Wallmann, Klaus
kwallmann@geomar.de
https://orcid.org/0000-0002-1795-376X information author Dale, Andrew W author Diercks, Isabel
idiercks@geomar.de
https://orcid.org/0009-0001-6814-8365 information author Kalapurakkal, Habeeb Thanveer
hkalapurakkal@geomar.de
author Schmidt, Mark
mschmidt@geomar.de
https://orcid.org/0000-0002-4298-9617 information author Sommer, Stefan
ssommer@geomar.de
author Böhnke, Stefanie
sboehnke-brandt@geomar.de
https://orcid.org/0000-0002-3431-5452 information author Perner, Mirjam
mperner@geomar.de
https://orcid.org/0000-0003-1223-9310 information author Geilert, Sonja
s.geilert@uu.nl
https://orcid.org/0000-0002-8971-5867 information author documentDigital Frontiers in Climate 5 1245580