. co- Fig. 9. Observed temperatures in the Scotia Sea, 1st September to 14th October, 1934, showing the apparent positions of the isotherms. Half-degree iso- Most charts of temperature distribution as observed therms are shown as pecked lines, and the ship's tracks at a particular time would be likely to show some features, such as tongues of warm or cold water and other bends in the isotherms, which are temporary, and which become smoothed out when the isotherms are drawn in their mean positions. Plates II-XII are intended to show only those features which seem to be constant, or which at lea
. co- Fig. 9. Observed temperatures in the Scotia Sea, 1st September to 14th October, 1934, showing the apparent positions of the isotherms. Half-degree iso- Most charts of temperature distribution as observed therms are shown as pecked lines, and the ship's tracks at a particular time would be likely to show some features, such as tongues of warm or cold water and other bends in the isotherms, which are temporary, and which become smoothed out when the isotherms are drawn in their mean positions. Plates II-XII are intended to show only those features which seem to be constant, or which at least are found in most of the years for which observations are available. Even such constant features have been drawn with caution, and it may be that some of them are not sufficiently emphasized. The following points may be noted. South of the Falkland Islands in about 55^ W there is some evidence of a northward thrust of cold water. This is noticeable in the chart for September and October (Plate II) where the isotherms are crowded up to the convergence. For this chart there are data only for one year (see Fig. 9), but the bend in the convergence here and the similar shape of the isotherms in other months suggest that this is a constant feature. It is perhaps more noticeable in spring than m summer. A more conspicuous tongue of cold water projects northwards around the South Sandwich Islands (near 30° W). This is often very pronounced, and it is probably connected with a comparatively narrow thrust of cold water off the north-east side of South Georgia, which was found during intensive observations around the island. Warmer water is found to the east of the South Sandwich Islands, and it is possible that the southward bend of the isotherms about 10-20° W is not sufficiently emphasized in the charts. It is best seen in the charts for March and April, but it is not certain that it is really
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