. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. HYDROLOGY OF THE SOUTH ATLANTIC 199 342 made in 1928-9: in the diagram there is also a curve which shows the surface temperature changes at Grytviken, in South Georgia. At Grytviken the surface tempera- ture is at a maximum in February and at a minimum in July. In the open sea the maximum and minimum are reached a little later than they are in inshore waters, which react more quickly to seasonal changes: the maximum temperature is probably at the end of February or early in March, and the minimu
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. HYDROLOGY OF THE SOUTH ATLANTIC 199 342 made in 1928-9: in the diagram there is also a curve which shows the surface temperature changes at Grytviken, in South Georgia. At Grytviken the surface tempera- ture is at a maximum in February and at a minimum in July. In the open sea the maximum and minimum are reached a little later than they are in inshore waters, which react more quickly to seasonal changes: the maximum temperature is probably at the end of February or early in March, and the minimum in August. In summer the tem- perature in the open sea decreases with depth from 2-45° C. at the surface to 0-17° C. at a depth of 105 m. With the approach of winter the surface is cooled, and in August the MARCH JUNE SEPTEMBER DECEMBER. Fig. 14. The seasonal changes in temperature of Antarctic surface water 50 miles north of Prince Olaf Harbour, South Georgia. surface was found to be colder than the rest of the layer. This is no doubt a temporary phenomenon due to the presence of water of slightly less salinity in the surface, but it shows that warming of the surface had not started at the end of August. Apart from the surface 5 m. the layer is homogeneous down to a depth of 80 m., but it begins to lose its homogeneous nature after November. The surface is warmed first, and in early summer the difference in temperature between the water at the surface and at 50 m. is greatest. By midsummer the layer is warmed down to a depth of about 80 m. and then there is a rapid decrease in temperature from 1-89° C. at 80 m. to 0-31° C. at 90 m. The surface 80 m. is still almost uniform, because of the great amount of vertical mixing which takes place in it during the turbulent movement of the pure drift currents, caused by the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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