The concentration and the ^<13>C/^<12>C ratio of atmospheric CO_2 were obtained by analyzing air samples collected by the airplane-borne grab-sampling system. Vertical distribution of the CO_2 concentration in winter showed that the surface of the earth is the source of CO_2. The CO_2 concentration at the altitude of 3km above the Pacific Ocean decreased as the latitude becomes smaller. The ^<13>C/^<12>C ratio varied inversely with the CO_2 concentration.
CO_2濃度及びCO_2炭素の同位体比の航空機サンプリングによる観測
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