A number of thermal fronts have been observed in the southern Sargasso Sea between latitudes 22°N and 32°N. Across all fronts the temperature changed 1°C or more within a distance of 10 km, with the colder water on the northern side. The fronts extend in depth from the surface to at least the bottom of the mixed surface layer. One front, surveyed for a distance of 150 km, appeared to run generally east‐west, although there was considerable meandering. Surface currents of as much as 60 cm/sec have been measured flowing eastward along the frontal edge. Calculations for one front indicate that the front is in approximate geostrophic equilibrium. Little or no frontal activity has been observed during the summer months.

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