Key points are not available for this paper at this time.
Precise measurements of the atmospheric C02 concentration were initiated at Syowa Station, Antarctica in 1983. Preliminary inspection of the data obtained up to the present showed that: (I) a regular diurnal variation is not observable; (2) irregular variations are sometimes observed with extremely small amplitudes of 0.2 ppmv at most; (3) a seasonal variation with the minimum concentration in mid-April and the maximum concentration in mid-October; and peak-to-peak amplitudes of about 1.2 ppmv are detected; (4) annual mean values of the C02 concentration are 341.2 and 342.6 ppmv for 1983 and 1984, respectively.
Tanaka et al. (Wed,) studied this question.