We have carried out the tank experiment
in the low-temperature room to clarify the CO2 gas exchange mechanism
between the sea and the overlying air during the sea-ice formation process. The
air CO2 concentration in the headspace of the tank began to increase
simultaneously with the sea-ice formation and growth. The CO2 flux
was with in the range from 2.1x10-4 to 4.5x10-4 g-C m-2
hour-1 at ice thickness of 5cm. The CO2 flux was
mainly dependent on the brine salinity in the upper layer of sea-ice, which
suggests that CO2 was released from the brine in the sea-ice, and
transported to the atmosphere.
Author: D. Nomura, H. Yoshikawa-Inoue, and T. Toyota
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