Systematic measurements of the CO2 concentration
and its carbon isotopic ratio (d13C)
have been carried out at 7 locations in China since March or July 2003.
Seasonal cycles of the CO2 concentration and d13C were clearly observable, especially at Longfengshan,
Shangdianzi and Fukang. The d13C
value of source producing the seasonal CO2 cycle at each site, dS, was estimated from the
observed CO2 and d13C
seasonal cycles. The average value of dS derived for the 6 sites was
calculated to be -25.6 (±1.8) ‰, which is larger than those observed at
mid-latitudes in the western Pacific region, probably due to smaller
discrimination of 13C by C4 plants in the continent of
China.
Author: S. Sugawara, S. Aoki, T. Nakazawa, J. Tang, et al (sugawara at staff dot miyakyo-u dot ac dot jp)
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