Dissolved inorganic carbon (DIC) in the surface water of the Daya Bay, China was investigated to analyze its temporal and spatial distribution in four different seasons during December 2010 to November 2011, and its influence aspects were also discussed. The results showed that the surface DIC concentration ranged from 19.49 to 23.20 mg·L-1, with average concentration of 21.13±1.07 mg·L-1, lower than that in the Yellow Sea and the East China Sea. Higher concentrations of DIC in surface waters were found in the northern & northwestern area, and lower concentrations in the eastern & outside sea area of Daya Bay. The temporal distribution of DIC was in the order of winter > summer > autumn > spring, but no significant differences were found among spring, summer and autumn. The DIC was found to be positively correlated with salinity, and negatively correlated with pH, temperature and chlorophyll a, but the correlation coefficient was not significant with the three environmental factors. The temporal and spatial variations of DIC were interpreted relative to monsoonal forcing, water temperature, salinity, hydrographic and biogeochemical features, organisms and so on.
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