A COMPARISON OF TEMPERATURE, SALINITY, AND CHLOROFLUOROCARBON OBSERVATIONS WITH RESULTS FROM A 1-DEGREES RESOLUTION 3-DIMENSIONAL GLOBAL OCEAN MODEL

We describe the ability of a moderate-resolution global ocean model to simulate the general circulation and the ocean-atmosphere exchange an d redistribution of chlorofluorocarbons (CFCs). The model was spun up from climatological initial conditions and has been integrated for dec ades representing 1930 to the present. Climatological monthly mean win ds were imposed during the spin-up and first 50 years of the integrati on, From 1980, monthly mean European Centre for Medium-Range Weather F orecasts (ECMWF) wind stress fields were used. We compare model result s to cruise data and to long-term mean observations and find good qual itative agreement in most areas. Overall, the model agrees reasonably well in regions where measurable CFCs have. been observed, and the lar ge-scale model ventilation pathways appear realistic. One of the most conspicuous shortcomings is the small volume of Antarctic Intermediate Water in the model results. This leads to errors in the general water mass structure and in CFC concentrations in the model in other region s. Notable CFC differences are found in regions where deep water masse s are formed and in the upper subtropical gyre regions in which the Ku roshio extension exists. The model oceanic CFC sink represents <1% of all CFCs produced since 1930 and is small relative to the stratospheri c sink for these compounds.