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The air-sea transfer velocity of C[O.sub.2] ([MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]) was investigated in a shallow estuary in March to July 2012, using eddy-covariance measurements of C[O.sub.2] fluxes and measured airsea C[O.sub.2] partial-pressure differences. A data evaluation method that eliminates data by nine rejection criteria in order to heighten parametrization certainty is proposed. We tested the data evaluation method by comparing two datasets: one derived using quality criteria related solely to the eddy-covariance method, and the other derived using quality criteria based on both eddy-covariance and cospectral peak methods. The best parametrization of transfer velocity normalized to a Schmidt number of 600 ([k.sub.600]) was determined to be: [k.sub.600] = 0.3 [U.sub.10.sup.2.5] where [U.sub.10] is the wind speed in m [s.sup.-1] at 10 m; [k.sub.600] is based on C[O.sub.2] fluxes calculated by the eddy-covariance method and including the cospectral peak method criteria. At low wind speeds, the transfer velocity in the shallow water estuary was lower than in other coastal waters, possibly a symptom of low tidal amplitude leading to low intensity water turbulence. High transfer velocities were recorded above wind speeds of 5 m [s.sup.-1], believed to be caused by early-breaking waves and the large fetch (6.5 km) of the estuary. These findings indicate that turbulence in both air and water influences the transfer velocity. Keywords Air-sea C[O.sub.2] exchange * Cospectral peak method * Eddy covariance * Estuaries * Transfer velocity