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. Uncertainties in carbon chemistry variability still remain large in the Gulf of Mexico (GoM), as data gaps limit our ability to infer basin-widepatterns. Here we configure and validate a regional high-resolution ocean biogeochemical model for the GoM to describe seasonal patterns in surfacepressure of CO2 (pCO2), aragonite saturation state (ΩAr), and sea–air CO2 flux. Modelresults indicate that seasonal changes in surface pCO2 are strongly controlled by temperature across most of the GoM basin,except in the vicinity of the Mississippi–Atchafalaya river system delta, where runoff largely controls dissolved inorganic carbon (DIC) and totalalkalinity (TA) changes. Our model results also show that seasonal patterns of surface ΩAr are driven by seasonal changes in DICand TA, and reinforced by the seasonal changes in temperature. Simulated sea–air CO2 fluxes are consistent with previousobservation-based estimates that show CO2 uptake during winter–spring, and CO2 outgassing during summer–fall. Annually, ourmodel indicates a basin-wide mean CO2 uptake of 0.35 molm-2yr-1, and a northern GoM shelf (&lt; 200 m) uptake of0.93 molm-2yr-1. The observation and model-derived patterns of surface pCO2 and CO2 fluxes show goodcorrespondence; thus this study contributes to improved constraints of the carbon budget in the region.

biogeosciences

Seasonal patterns of surface inorganic carbon system variables in the Gulf of Mexico inferred from a regional high-resolution ocean biogeochemical model