PANGAEA_972505 Total organic carbon and stable carbon isotopes of dust samples from ephemeral rivers in Namibia analyzed after the sorption experiment van Kaam, Rianne J M Total organic carbon and stable carbon isotopes of dust samples from ephemeral rivers in Namibia analyzed after the sorption experiment 2025-07-24 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.972505 Investigator Rianne J M van Kaam rvankaam@marum.de Earth Science Event label Type of study Sample code/label Dust, added Carbon, organic, total δ13C, total organic carbon δ13C, total inorganic carbon geoscientificInformation 1-Kuiseb 2-Kuiseb 3-Omaruru Adsorption dissolved organic carbon (DOC) Dust sample Ephemeral river Mineral dust Namibia Sorption experiments Isotope ratio mass spectrometry (IRMS), Delta V Plus (Thermo Scientific) coupled via a ConFlo IV interface to an elemental analyser Isotope ratio infrared spectrometry (IRIS) with universal reference interface (URI) connection, Delta Ray (Thermo Scientific) 2023-04-22 2023-04-23 Complete -23.5629 -21.899 14.5084 15.0394 MARUM Center for Marine Environmental Sciences unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 90 data points text/tab-separated-values van Kaam, Rianne J M; Kölling, Martin; Elvert, Marcus; Hinrichs, Kai-Uwe; Zabel, Matthias (2025): Dust deposition directly affects the concentration of dissolved organic carbon in the ocean. Marine Chemistry, 271, 104531, https://doi.org/10.1016/j.marchem.2025.104531

For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.972505"! ** Different amounts of dust (5 mg and 100 mg) were added to a mixture (30 mL) of artificial seawater and 13C-labeled Spirulina extract (~500 µM). Water samples were taken at multiple time points (0, 10, 24, 48, 72, 120, and 168 hours) and analyzed for DOC using a carbon analyzer (multiN/C 2100s, Analytik Jena). Dust samples were analyzed for TOC and δ13C-TOC before and after the experiments using isotope ratio mass spectrometry (IRMS) (Delta V Plus, Thermo Scientific, with a ConFlo IV interface to an elemental analyzer), calibrated against the Vienna Pee Dee Belemnite (VPDB) standard with a precision of ±0.35‰. After 72 hours, water samples were also analyzed for δ13C-DIC using isotope ratio infrared spectrometry (IRIS) with a universal reference interface (URI) (Delta Ray, Thermo Scientific), calibrated to the VPDB standard with a precision of ±0.05‰.

https://doi.org/10.1016/j.marchem.2025.104531 Dust deposition directly affects the concentration of dissolved organic carbon in the ocean https://www.marum.de/en/ MARUM PANGAEA_972507 DIF 9.4 2025-07-24 2025-08-22