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Real-time monitoring for environmental factors(temperature, salinity, chlorophyll, etc.) and carbonate components(pH and fCO 2 ) was conducted during 5-6th of July, 2012 at a seaweeds farm in Gijang, Busan. Surface temperature and salinity were ranged from 12.5~17.6 o C and 33.7~34.0, respectively, with highly daily and inter-daily variations due to tide, light frequency(day and night) and currents. Surface f CO 2 and pH showed a range of 381~402µatm and 8.03~8.15, and chlorophyll-a concentration in surface seawater ranged 0.8~5.8 µg L -1. Environmental and carbonate factors showed the highest/lowest values around 5 pm of 5th July when the lowest tidal height and strongest thermocline in the water column, suggesting that biological production resulted in decrease of CO 2 and increase of pH in the seaweed farm. Processes affecting the surface f CO 2 distribution were evaluated using a simple budget model. In day time, biological productions by phytoplankton and macro algae are the main factors for CO 2 drawdown and counteracted the amount of CO 2 increase by temperature and air-sea exchange. The model values were a little higher than observed values in night time due to the over-estimation of physical mixing. The model suggested that algal production accounted about 14-40% of total CO 2 variation in seaweed farm.