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The seasonal cycle of δ 13 C was clearly observable at latitudes from 55°N to the equator. Peak-to-peak amplitude of the average seasonal cycle of δ 13 C was about 0.8‰ at latitudes north of 40°N and decreased going southward to 0.2‰ at the equator. The results suggest that the seasonal CO 2 cycles observed at latitudes north of the equator are due to the seasonal...
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