Martin et al. (2023): Improving nitrogen cycling in a land surface model (CLM5) to quantify soil N2O, NO, and NH3 emissions from enhanced rock weathering with croplands

Maria Val Martin, Elena Blanc-Betes, Ka Ming Fung, Euripides P. Kantzas, Ilsa B. Kantola, Isabella Chiaravalloti, Lyla L. Taylor, Louisa K. Emmons, William R. Wieder, Noah J. Planavsky, Michael D. Masters, Evan H. DeLucia, Amos P. K. Tai, David J. Beerling IN: Geoscientific Model Development, 16, 20, https://doi.org/10.5194/gmd-16-5783-2023

Unintended biogeochemical interactions with the nitrogen cycle may arise through enhanced rock weathering (ERW) increasing soil pH as basalt grains undergo dissolution that may reinforce, counteract, or even offset the climate benefits from carbon sequestration. Increases in soil pH could drive changes in the soil emissions of key non-CO₂ greenhouse gases, e.g., nitrous oxide (N₂O), and trace gases, e.g., nitric oxide (NO) and ammonia (NH₃), that affect air quality and crop and human health. The authors present the development and implementation of a new improved nitrogen cycling scheme for the Community Land Model v5 (CLM5), the land component of the Community Earth System Model, allowing evaluation of ERW effects on soil gas emissions.

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