. 2500m _3SOOm 5000 m Text-fig. 19. Distribution of temperature (° C.) between 700 S. and 350 S. in the region of the Greenwich Meridian, March-April 1937 (see Text-fig. \a for station positions). discontinuity (indicated by the 230 C. isotherm) with the South Atlantic Central Water. The Tropical Convergence does not appear to have as much influence on the distribution of pelagic polychaetes as either the Antarctic or Sub-Tropical Convergences. (ii) INTERMEDIATE AND DEEP WATER MASSES When the Antarctic Surface Water sinks at the Antarctic Convergence it mixes with water of Sub- Antarctic origi

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. 2500m _3SOOm 5000 m Text-fig. 19. Distribution of temperature (° C.) between 700 S. and 350 S. in the region of the Greenwich Meridian, March-April 1937 (see Text-fig. \a for station positions). discontinuity (indicated by the 230 C. isotherm) with the South Atlantic Central Water. The Tropical Convergence does not appear to have as much influence on the distribution of pelagic polychaetes as either the Antarctic or Sub-Tropical Convergences. (ii) INTERMEDIATE AND DEEP WATER MASSES When the Antarctic Surface Water sinks at the Antarctic Convergence it mixes with water of Sub- Antarctic origin, and together with this gives rise to the north-flowing Antarctic Intermediate Water. Below the Antarctic Surface Water and Antarctic Intermediate Water throughout the South Atlantic is the Warm Deep Water with a southerly component in its movement, and beneath it the heavy Antarctic Bottom Water.

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