[Amazon isotopes POC CN] - Radiocarbon, stable carbon isotope and C/N composition of Amazon River particulate organic carbon (POC) from samples collected aboard the R/V Mirage in May of 2023 (Collaborative Research: What Happens to Terrestrial Organic Matter in the Ocean? Solving the Mystery Behind an Iconic Question)

The tabulated data include sample number, date, latitude, longitude, sample type, fraction modern radiocarbon (Fm), Δ14C, δ13C, and molar C/N ratio for suspended sediment, bedload, and bank/flood-deposit samples. Sampling was conducted at discrete sites along the lower Amazon mainstem and nearby depositional environments, so spatial coverage is variable rather than uniform.

Samples were collected in the field and analyzed to determine radiocarbon content, stable carbon isotopic composition, and elemental stoichiometry in order to evaluate the sources, transport pathways, and age of riverine organic carbon. The dataset will be useful to investigators studying carbon cycling, sediment dynamics, and organic matter provenance in large tropical river systems, and it may contribute to broader studies of land-to-ocean carbon transfer.