Abstract:Based on four investigations of total alkalinity and pH, and combined with other chemical, biological factors and mariculture activities, the distribution characteristics, seasonal variation of seawater CO2 parameters and the major influencing factors were discussed in this research. The results showed that in October and January, the CO2 system parameters were primarily influenced by temperature and salinity; while in August, the pCO2 and pH were controlled by dissolved oxygen and primary productivity, respectively. While in April, no significant correlation was found between CO2 system parameters and hydrological, chemical or biological factors. The maximum differences in spatial distribution of pCO2 were in August, followed by October, April and January. Average pCO2 in the four investigations were below the atmospheric CO2 pressure; seasonal trend in pCO2 was August
