Abstract
A simple method is presented to calculate the CO 2 vertical turbulent diffusion coefficient in the upper layer above a Posidonia sea grass bed. The method relies on the measurement of the attenuation and phase shift of the diurnal CO 2 variation at different depths in the water column. The values of the turbulent diffusion coefficient fall in the upper range of values given in the literature for the mixed layer (⋍10 2m 2s 1), which is consistent with the high-energy environment studied.
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