We used an in situ oceanographic system to measure the degree of saturation (IP/Ksp′) of calcium carbonate. Results of two profiles measured in the eastern Pacific Ocean off southern California are described and compared with data obtained by conventional chemical techniques. From this preliminary study it appears that the waters investigated become undersaturated with calcite at a depth of approximately 400 meters and remain so to a depth of about 1600 meters, where they move towards saturation. Below 2500 meters they appear to become undersaturated again and probably remain so to the depth of the ocean floor.
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Ben‐Yaakov et al. (1971) studied this question.
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