Antropogenic CO2 in the intermediate water of the northwest Pacific

The anthropogenic CO2 concentrations in the northwest Pacific were calculat ed on the basis of observations of temperature, salinity, carbonate paramet ers and oxygen from the expeditions on board the R/V "Akademik A. Vinogrado v" in April-May 1991 and in August 1992. Anthropogenic CO2 distribution at the isopycnal sur faces in different structural zones of the intermediate w ater is discussed. The data analysis in the layer of 26.8-27.5 sigma-theta of the study area suggests that linear relations exist between anthropogeni c CO2 and freons concentrations and salinity. The increase of salinity in t he intermediate laver from subarctic to subtropic zone is accompanied by th e decrease of freons and anthropogenic CO2 concentrations as a result of is opycnal and diapycnal mixing. Differences between the anthropogenic CO2 ver tical profiles in the intermediate layer ob rained in the GEOSECS expeditio n (1973) and recent observations (1991) were found.