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The exchange rate of CO2 between the atmosphere and Lake Suwa, a eutrophic lake in Nagano Prefecture (Japan), was estimated based on a floating box experiment. The diurnal variation of the exchange rate of CO2 indicated that the ratio of photosynthetic rate to respiratory rate including organic matter decomposition is highest at 15 o'clock and lowest at 3 o'clock. The seasonal variation of the average daily exchange rate of CO2 indicated that the absorption flux of CO2 occured during the period from early spring to middle summer and the evolution flux of CO2 during the period from late summer to late autumn. The average daily absorption rate of CO2 on 17-18 July 1973 was estimated at 1.3 CO2-C g/m2/day, when the water bloom of Microcystis developed.

Diurnal and Seasonal Variations of Exchange Rate of Carbon Dioxide across an Air-Lake Water Interface