CO 2 drawdown from weathering is maximized at moderate erosion rates.

Autor: Bufe A; Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, 80333, Germany., Rugenstein JKC; Department of Geosciences, Colorado State University, Fort Collins, CO 80523, USA., Hovius N; GFZ German Research Center for Geosciences, Potsdam, 14473, Germany.; Department of Earth Sciences, University of Potsdam, Potsdam, 14476, Germany.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2024 Mar 08; Vol. 383 (6687), pp. 1075-1080. Date of Electronic Publication: 2024 Mar 07.
DOI: 10.1126/science.adk0957
Abstrakt: Uplift and erosion modulate the carbon cycle over geologic timescales by exposing minerals to chemical weathering. However, the erosion sensitivity of mineral weathering remains difficult to quantify. Solute-chemistry datasets from mountain streams in different orogens isolate the impact of erosion on silicate weathering-a carbon dioxide (CO 2 ) sink-and coupled sulfide and carbonate weathering-a CO 2 source. Contrasting erosion sensitivities of these reactions produce a CO 2 -drawdown maximum at erosion rates of ~0.07 millimeters per year. Thus, landscapes with moderate uplift rates bolster Earth's inorganic CO 2 sink, whereas more rapid uplift decreases or even reverses CO 2 sequestration. This concept of an "erosion optimum" for CO 2 drawdown reconciles conflicting views on the impact of mountain building on the carbon cycle and permits estimates of geologic CO 2 fluxes dependent upon tectonic changes.
Databáze: MEDLINE
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