. Fig. 10. Thermograph records showing the sudden change in temperature at the Antarctic (left) and sub- tropical (right) convergences (vertical scale in ° C). a drop of surface temperature from 3-2 to — 0-2' C, registered when the Antarctic convergence was crossed from north to south: it represents a sharp convergence. Occasionally, and especially if the convergence is crossed obliquely, we have found that it is not straight, and the ship passes through cold and warm patches of water alternately. This has been noticed particularly after bad weather, when the speed and direction of the surface
. Fig. 10. Thermograph records showing the sudden change in temperature at the Antarctic (left) and sub- tropical (right) convergences (vertical scale in ° C). a drop of surface temperature from 3-2 to — 0-2' C, registered when the Antarctic convergence was crossed from north to south: it represents a sharp convergence. Occasionally, and especially if the convergence is crossed obliquely, we have found that it is not straight, and the ship passes through cold and warm patches of water alternately. This has been noticed particularly after bad weather, when the speed and direction of the surface pure drift currents will have been varying considerably. It is, however, found that there is always either a sharp convergence or these patches, and never a gradual change from one kind of water to the other. The convergence is usually not ver}^ well defined in the bend to the west in about 50° W, nor in the northerly bend to the north of South Georgia, and in both places there is a tendency for sub-Antarctic
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