HYDROLOGY OF THE BRANSFIELD STRAIT 



4i 



specific volume anomalies were the same at the lowest depths. Table III gives the 

 stations in the two principal lines which were linked by means of the Jacobsen and 

 Jensen method. 



Table III 



In the observations made in December 1930, two of the lines of stations were from 

 Cape Melville, King George Island, to Trinity Peninsula and from midway between 

 Elephant and Clarence Islands in the direction of Joinville Island. 



NOVEMBER 1929 AND DECEMBER 1930 



After a preliminary survey of the data it was decided to commence with the November 

 1929 observations and try to build up a composite picture of the lines of flow in the 

 strait by adding to the November charts the values in December 1930. This representa- 

 tion is open to criticism because of the fact that observations from two different years 

 are brought together. It is, however, impossible to give a picture of the flow, either into 

 or out of the strait, of Bellingshausen Sea water and of the influence of the water from the 

 Weddell Sea, unless stations on either side of the two principal lines of November 1929 

 are considered. The presence of Weddell Sea water at the north-east end of the strait 

 and its influence across the strait had been previously suspected, but it was not until 

 the values of December 1930 had been added to those of the November 1929 survey 

 that the turn of this water to the north across the strait was demonstrated. Table IV and 

 the explanation below show how the relative heights of the sea surface at stations in 

 November 1929 were calculated. 



By using the Jacobsen and Jensen formula 



C=-(Vb 2 - V<h), 



where C = correction to be added to the difference of the depths of the isobaric surface 

 at the depth of the shallower station ; z = the difference in depth in metres of the two 

 stations ; Vb 2 and Va 2 = specific volumes in situ at the two stations at a depth equal to 

 that of the shallower station ; we obtain 



WS 480-WS 486 = — 2-03 dynamic cm. (1). 



By a direct comparison of the dynamic depth of the 1800 decibar surface we have 



WS 480-WS 482 = 0-05 dynamic cm. (2). 



Subtracting (1) and (2) we obtain WS 482-WS 486 = - 2-08. 

 Assuming WS 482 to be the basic station we obtain WS 482 = o-oo and WS 486 = 

 2-08. 



