Abstract
Carbonate saturation state with respect to calcite and three different biogenic magnesian calcites has been determined by a modified saturometry technique. Measurements were made in the water column of Devil's Hole, a 25 m-deep basin in the Harrington Sound (Bermuda), which exhibits oxygen depletion in subthermocline waters during summer. Supersaturation in the entire water column was attained with respect to marble calcite. The biogenic carbonates analyzed became undersaturated below the thermocline within a narrow depth range, soon after P CO 2 exceeded 600 ppm. It is concluded that high magnesian calcites can be attacked during a significant portion of the year in these waters. Possible implications for the global CO 2 cycle are discussed.
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