Abstract
The Guinea Dome area (12°N, 22°W) is characterized by a summertime O2 maximum which lies at the top of the thermocline. The vertical distributions of molecular nitrogen and argon are used to discuss the physical and biological contributions to oxygen supersaturation in that region. Whereas this subsurface O2 maximum is as sharp as those encountered elsewhere in the ocean, it is not at a high supersaturation level (maximum 4.4% on average). Thus the O2 maximum does not seem to be mainly due to photosynthesis and hence Reid's [1962] physical hypothesis appears to be like the major explanation.
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