The initial implementation of ocean alkalinity enhancement (OAE) added alkalinity to the sea surface at very high rates within the Chinese Exclusive Economic Zone, following Foteinis et al. (2022). These OAE rates pushed surface alkalinity outside the operational range of NorESM2’s seawater carbonate chemistry module, producing inconsistent sea-surface carbonate chemistry. The same occurs with the simulation of direct carbon removal (DCR) based on these OAE rates. This dataset update provides outputs from two re-run simulations using constraints on OAE and DCR, ensuring operational conditions of the carbonate chemistry module:   
(1) esm-ssp534-over-2040high: The OAE rate is now applied only when the aragonite saturation state per time step and grid cell remains below 25 — an extreme value previously exceeded in only a few grid cells.   
(2) esm-ssp534-over-2040high-dcr: Direct carbon removal (DCR) is now applied only when the sea surface partial pressure of carbon dioxide per time step and grid cell is above 20 uatm. 
     
updated files are also linked here in the individual scenario directory with update date identifier "*_v2025mmdd.nc" in file name    
    ./esm-ssp534-over-2040high   
    ./esm-ssp534-over-2040high-dcr    
    
updated on 2025-11-03 by kgetzlaff@geomar.de