Reply to comment by Thomas M. Blattmann on “Carbon dioxide emissions by rock organic carbon oxidation and the next geochemical carbon budget of the Mackenzie River Basin”, v. 319, n. 6, p. 473–499.
Résumé
Blattmann’s comment (Blattmann, 2019a) focuses on observations and proposalsmade in the concluding paragraphs of our “Wider Implications” section (pg. 495) andbriefly summarized in the final sentence of the abstract. In our manuscript (Horan andothers, 2019), these interpretations follow on from our measurements of rhenium inriver waters and sediments across the Mackenzie Basin, alongside complementarygeochemical data, which quantify the ongoing rates of rock-derived (‘petrogenic’)organic carbon oxidation. We combine our findings with two decades of publishedresearch to attempt a net geochemical carbon budget during weathering and erosionfor this large river basin (fig. 5 in Horan and others, 2019).