Extended Data Fig. 6: Uncertainty in ocean CDR with ERW.
From: Substantial carbon drawdown potential from enhanced rock weathering in the United Kingdom
Uncertainty in ocean CDR with ERW. Results show ocean CDR simulated by the intermediate complexity Earth System Model, Genie (blue line), and an empirical function accounting CO2, ocean temperature and salinity6 (red dashed line). Panels display results for simulations of scenario 1 for rock grain (a) p80 = 10 µm and (b) p80 =100 µm, scenario 2 for rock grain (c) p80 = 10 µm and (d) p80 =100 µm, and scenario 3 for rock gain (e) p80 = 10 µm and (f) p80 =100 µm. Genie uncertainties represent 90% confidence limits based on ensemble simulations with 84 different parameter sets. The difference the result of Earth system feedbacks in Genie whereby atmospheric CO2 lowered by ERW causes oceanic outgassing, and sediment CaCO3 uptake reduces alkalinity. Simulations use annual alkalinity fluxes generated by the 1-D soil profile weathering with three UK basalts.
