Discovery reports (1962) Discovery reports discoveryreports30inst Year: 1962 ZOOGEOGRAPHY 207 Text-figs. (15-221) of temperature and salinity sections on the Greenwich Meridian have been prepared from data in the Discovery Station Lists. They indicate the seasonal and depth fluctuations in hydrological conditions and the movements of the principal water masses. I have drawn freely from the work of Deacon (1933, 1937) on the hydrology of the Antarctic Sector of the South Atlantic and along the meridian of 300 W., and from Mackintosh (1946) on the varying positions of the Antarctic Convergence
Discovery reports (1962) Discovery reports discoveryreports30inst Year: 1962 ZOOGEOGRAPHY 207 Text-figs. (15-221) of temperature and salinity sections on the Greenwich Meridian have been prepared from data in the Discovery Station Lists. They indicate the seasonal and depth fluctuations in hydrological conditions and the movements of the principal water masses. I have drawn freely from the work of Deacon (1933, 1937) on the hydrology of the Antarctic Sector of the South Atlantic and along the meridian of 300 W., and from Mackintosh (1946) on the varying positions of the Antarctic Convergence. I OM IOOOM 2000 M 3000 M 4000M ANTARCTIC BOTTOM WATER Text-fig. 14. Diagram indicating the circulation of water approximately along the meridian of 30° W. The arrows indicate the general movement of the water masses. = Antarctic Convergence, = Sub-Tropical Convergence, = Tropical Convergence. (i) SURFACE WATER MASSES (a) Antarctic Surface Water is found around Antarctica as a cold poorly saline layer lying in the surface 100-250 m. above warmer water of higher salinity. In the South Atlantic Ocean, three main sources of water contribute to its composition: (1) Water from the Bellingshausen Sea which flows in along the southern side of the Drake Strait, (2) water flowing out of the Weddell Sea in a north- easterly direction, and (3) water from the East Wind Drift which flows in a westerly direction from the southern Indian Ocean into the Weddell Sea. Of these three components the Weddell Sea Water (Weddell Drift) probably exerts the greatest influence because in winter it carries the main body of pack-ice across the South Atlantic. 1 The vertical scale in these sections has been much exaggerated, and to avoid confusion all the readings have not been included on the figures but they have all been taken into account in drawing the isotherms and isohalines. It is not con- sidered that temperature and salinity are more, or less, important than other hydrologic
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