Abstract
The concentration of atmospheric CO2 was measured on the summit of Mt. Fuji, Japan by using a flask sampling method in October 1980 and by operating a system for continuous measurement in July to October 1981. The diurnal CO2 variation was scarcely found, but irregular variations with periods of 3 to 5 days usually appeared especially in July and August, reflecting the difference of air masses arrived at the observation site in association with synoptic-scale weather systems. The CO2 concentrations at Mt. Fuji were found to be very close to those in the middle troposphere over Japan by comparing with the results of aircraft measurements. A trend of secular increase in the atmospheric CO2 concentration was suggested even from our present results for the limited observational period in two successive years.
