Alkalinity Enhancement in Subduction Regions and the Global Ocean: Efficiency, Earth System Feedbacks, and Scenario Sensitivity

The dataset includes the minimum data required to reproduce the findings of Nagwekar et al. (2025) titled "Alkalinity Enhancement in Subduction Regions and the Global Ocean: Efficiecny, Earth System Feedbacks, and Scenario Sensitivity". The output of the Earth System Mode AWI-ESM1 coupled to global ocean biogeochemical model FESOM1.4-REcoM2, land component JSBACH, and atmosphere component ECHAM implementing Ocean Alkalinity Enhancement (OAE) is provided. OAE is deployed globally and in the subduction regions of the Southern Ocean and the North Atlantic. Simulations are conducted under SSP1-2.6 and SSP3-7.0 emission scenario. In particular it contains: a) model grid b) Time-series for oceanic CO2 uptake for CTRL (no OAE), global OAE (GLO-ALK), and subduction regions OAE (SUB-ALK) from 2030 to 2100. c) Time-series for OAE efficiency (2030-2100) for GLO-ALK and SUB-ALK. d) Data points for increase in oceanic CO2 uptake relative to CTRL due to OAE versus added amount of alkalinity for various peer reviewed articles. e) Surface fields for increase in oceanic CO2 uptake (2030-2100) for GLO-ALK and SUB-ALK and surface fields for its correlation coefficient with mixed layer depth, wind speed, and sea surface temperature. f) Time-series for increase in dissolved inorganic carbon (DIC) relative to CTRL for GLO-ALK and SUB-ALK (2030-2100) using the ESM and ocean-only model in the top 1 km and the layer below 1 km of the water column. Surface fields for increase in DIC for GLO-ALK and SUB-ALK using the ESM in the top 1 km and below 1 km of the water column. g) Time-series for changes in atmospheric CO2 concentration and Surface Air Temperature relative to CTRL for GLO-ALK and SUB-ALK (2030-2100). Data points for changes in atmospheric CO2 concentration and Surface Air Temperature form various peer reviewed articles. h) Time-series for cumulative change in oceanic CO2 uptake and land carbon (2030-2100) relative to CTRL for GLO-ALK and SUB-ALK. All the data is available for the SSP1-2.6 and SSP3-7.0 emission sceanrio.