. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. HYDROLOGY OF THE BRANSFIELD STRAIT 37 this layer was observed at the next station, but at Sts. 544 and 545 small temperature inversions below the surface layer indicate the influence of the warmer water. At St. 545 a second though small temperature inversion is seen at 500 m., or some 100 m. above the sea-bottom. This corresponds to a temperature inversion, also at 500 m., which occurs below the vertically mixed surface layer at St. 546. The presence of such an irregular temperature series at St
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. HYDROLOGY OF THE BRANSFIELD STRAIT 37 this layer was observed at the next station, but at Sts. 544 and 545 small temperature inversions below the surface layer indicate the influence of the warmer water. At St. 545 a second though small temperature inversion is seen at 500 m., or some 100 m. above the sea-bottom. This corresponds to a temperature inversion, also at 500 m., which occurs below the vertically mixed surface layer at St. 546. The presence of such an irregular temperature series at Sts. 538, 540, 545 and 546 and the proximity of these stations to the flow of pack-ice from the Weddell Sea, would seem to indicate that the level of the upper boundary of the warm deep water may be depressed during a season when vertical mixing is particularly easy, when the surface is freezing or being cooled by pack-ice. This would account for the depth of the lower temperature inversion. Sub- sequently new relatively warm water may appear at a higher level and form the upper inversion. An alternative explanation may be that warm deep water from the Weddell Sea flows over the ridge between Elephant and Clarence Islands to Joinville Island, and thus at these stations warm deep water from both the west and the east is present. STATION SNOW I. 549 550 551 552 553 SOOn IOOOn 1500s 34 I0%„ TRINITY I. Fig. 48. Vertical section of salinity: Snow Island to Trinity Island, December 1930. Antarctic bottom water is found in considerable quantity at depths below the intermediate temperature maxima. The vertical sections of the line between Snow Island and Trinity Island are given in Figs. 48-50. The line cuts across the smaller basin at the south-west end of the Bransfield Strait. The surface water at all the stations has been warmed by the sun. A cold nucleus of the Antarctic surface water, with temperature below — 0-50° C, is seen in the two most northern stations and at the s
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