Observations of Antarctic Polar Front Motions in a Deep Water Expression

Abstract

It is shown that perturbations in the position of the surface and subsurface expressions of the polar front in Drake Passage are also evident in a deep water frontal expression. This deep water expression has been seen in hydrographic surveys as a sharp horizontal temperature gradient underlying the polar front and extending nearly to the bottom. The connection is documented for two periods in 1976 when direct measurements were available in the upper and deep water.