. 1 1 1 52 53 54 1 55 1 55 1 57 1 53 1 59 1 60 1 61 1 62 I 63 1 64 I 65 t 6S \ 67 1 6B DcGRCES SOUTH Fig. 10. Comparison of average monthly temperatures, based on monthly isotherms. melts away it tends to leave a long tongue of cold water which is seen as a conspicuous S-shaped turn in the isotherms in Plates V-VII. The shape of the isotherms here is subject to a good deal of variation. The data indicate that a line of observations running south from the convergence will usually, but not always, reveal a slight rise in temperature about 60-65° S, and if there is no actual rise in temperature,
. 1 1 1 52 53 54 1 55 1 55 1 57 1 53 1 59 1 60 1 61 1 62 I 63 1 64 I 65 t 6S \ 67 1 6B DcGRCES SOUTH Fig. 10. Comparison of average monthly temperatures, based on monthly isotherms. melts away it tends to leave a long tongue of cold water which is seen as a conspicuous S-shaped turn in the isotherms in Plates V-VII. The shape of the isotherms here is subject to a good deal of variation. The data indicate that a line of observations running south from the convergence will usually, but not always, reveal a slight rise in temperature about 60-65° S, and if there is no actual rise in temperature, there will at least be a long expanse of ocean in which the temperature at the surface will change very little. The existence of a belt of relatively warm water here, which melts the ice in a high latitude while a zone of pack-ice still persists to the north of it, is noted by Deacon (1937, pp. 18, 28, etc., and Fig. 8), who describes it as an ill-defined divergence region with an upwelling of warm water between the Weddell Sea current moving eastwards in a lower latitude, and the current moving westward in a higher latitude near the continental coast. Deacon also refers (p. 30) to the outer and inner belts of pack-ice, and adds: ' It is just possible that even in winter there may be open water between the two ice-streams in the eastern part of the Atlantic Ocean.'
Size: 2684px × 1862px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
