abstract
The thermal structure of the upper ocean layers between Cape Town and Prydz Bay and in the SIBEX area was examined by means of expendable bathythermographs (XBT probes) at stations along two cruise-legs and by Crawford bucket at closely spaced surface stations. These measurements delineated clearly the locations of four major ocean fronts. These were the Agulhas Front, Subtropical Front, Subantarctic Front and Antarctic Polar Front. The temperatures at these features were found to be, in general, higher than the average readings reported in the literature and it was concluded that a well-developed summer thermal regime had been observed. In the surface layers of the SIBEX survey area itself a clear front at 64°30'S and the Continental Water Boundary were the setting for the survey.
