. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 202 DISCOVERY REPORTS more conspicuous in these months than at other times of year. It seems probable that further examina- tion of such features as these will show that they are correlated with the effects of bottom topography. Between about io° W and 30° E the positions of the isotherms are very much influenced by the eastward flow of cold water from the Weddell Sea, which also has an important effect here on the distribution of pack-ice in the early summer (see Mackintosh and Herdman, 1940,
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 202 DISCOVERY REPORTS more conspicuous in these months than at other times of year. It seems probable that further examina- tion of such features as these will show that they are correlated with the effects of bottom topography. Between about io° W and 30° E the positions of the isotherms are very much influenced by the eastward flow of cold water from the Weddell Sea, which also has an important effect here on the distribution of pack-ice in the early summer (see Mackintosh and Herdman, 1940, p. 293). In winter and spring the isotherms tend to be pressed up towards the convergence which here lies about its lowest latitude, but in December, while pack-ice and cold water persist in a relatively low latitude between o and 30° E, east of 30° both ice-edge and isotherms bend far to the south, and the ice belt begins to break up internally, leaving an outer zone which contracts towards the South Sandwich Islands (compare the ice-edge in Plates IV and V, December and January). As the outer zone of ice 60 â S-6 - 40- 3-0- 2-D- 1-0- 00- -l-O-. 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 sti
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