Air-sea CO2 fluxes and the controls on ocean surface pCO2 seasonal variability in the coastal and open-ocean southwestern Atlantic Ocean : a modeling study

摘要: Abstract. We use an eddy-resolving, regional ocean biogeochemical model to investigate the main variables and processes responsible for climatological spatio-temporal variability of pCO2 air-sea CO2 fluxes in southwestern Atlantic Ocean. Overall, region acts as a sink atmospheric south 30° S, is close equilibrium with north. On shelves, weak source CO2, except mid/outer shelves Patagonia, which act sinks. In contrast, inner low latitude open represent regions. Observed nearshore-to-offshore meridional gradients are well represented by our simulation. A sensitivity analysis shows importance counteracting effects temperature dissolved inorganic carbon (DIC) controlling seasonal pCO2. Biological production solubility regulating pCO2, biological being particularly important on shelves. The role mixing/stratification modulating DIC, therefore surface shown vertical profile at location Ocean Observatories Initiative (OOI) site Argentine Basin (42° 42° W).