Lehmann et al. (2023): Alkalinity generation from carbonate weathering in a silicate-dominated headwater catchment at Iskorasfjellet, northern Norway

Nele Lehmann, Hugues Lantuit, Michael Ernst Böttcher, Jens Hartmann, Antje Eulenburg, Helmuth Thomas IN: Biogeosciences, https://doi.org/10.5194/bg-20-3459-2023

In this study, the authors aimed to identify the weathering sources responsible for alkalinity generation and CO₂ fixation across watershed scales in a degrading permafrost landscape in northern Norway, 68.7–70.5^∘ N, and on a temporal scale, in a subarctic headwater catchment on the mountainside of Iskorasfjellet, characterized by sporadic permafrost and underlain mainly by silicates as the alkalinity-bearing lithology. By analyzing total alkalinity (AT) and dissolved inorganic carbon (DIC) concentrations, as well as the stable isotope signature of the latter (δ¹³C-DIC), in conjunction with dissolved cation and anion loads, they found that AT was almost entirely derived from weathering of the sparse carbonate minerals.

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