Abstract
Partial pressure of CO 2 in equilibrium with sample water (pCO 2) for the coastal water in the Chukchi Sea was continuously observed in summer, 2008. Average daily CO 2 flux calculated from the pCO 2 and gas transfer coefficients ranged from −0.144 to −0.0701 g C m −2 day −1 depending on which gas transfer coefficient was used. The pCO 2 before the landfast ice sheets melted appeared to be highly biologically controlled based on the following information: (1) the diurnal pattern of pCO 2 was strongly correlated with Photosynthetic Photon Flux Density (PPFD); (2) high chlorophyll density was observed during periods of peak uptake; and (3) the day-to-day variation in the pCO 2 strongly correlated with the presence or absence of near-shore ice sheets. The lowest pCO 2 of 35 ppm together with the highest PPFD of 1362 μmol E m −2 s −1 were observed in the afternoon on June 28 in the presence of sea ice. The very low pCO 2 observed in late June was likely caused by high photosynthetic rates related to high phytoplankton densities typically observed from spring to early summer near the ice edge, and by water low in salinity and CO 2 released by melting sea ice early in the season.
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