Data for temperature, salinity, and dissolved oxygen at stations in the Tongue of the Ocean are analyzed for spatial and seasonal variations. The water of the Tongue closely resembles, and is in free circulation with, the Sargasso Sea east of the Bahamas. Annual changes in the surface
layers are associated with seasonal heating and cooling and with the intrusions of bank water. The oxygen-density relation of the Tongue water suggests that traces of water from the Caribbean Sea enter the Tongue of the Ocean via the Straits of Florida and the Northwest Providence Channel.
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