Mixed layer saturations of CFC‐11, CFC‐12, and SF6 in a global isopycnal model

摘要: [1] The use of CFC-11, CFC-12, and SF6 to quantify oceanic ventilation rates, interior water age, formation rates requires knowledge the saturation levels at sea surface. While their atmospheric histories are relatively well known, physical processes in mixed layer conjunction with limited air-sea gas exchange can cause surface concentrations be disequilibrium atmosphere. We an offline tracer advection-diffusion code that evolves tracers using along-isopycnal cross-isopycnal mass fluxes from a global, climatological run Hallberg Isopycnal Model reconstruct level all three over entirety histories. Disequilibria on global scale occur regions associated deep winter layers found throughout time period release these chemicals into Sensitivity studies targeted model simulations, focusing North Pacific, show seasonal cycles temperature salinity affect solubility as entrainment containing low concentration during deepening dominant causes undersaturation. When transit distribution method, our results undersaturations introduce significant bias toward older ages for Pacific Central Mode Water but do not significantly estimates anthropogenic carbon inventory.