2 3°00'n. 



22°45 N 



log'so'w. 



Figure 12. — Apparent paths of four drogues released in the middle or slightly on the warm side of front 5 on 21 

 April 1961. Track changes were based on subsequent sightings, the times of which are given where space allows. 

 The temperature (°C.) of the surface water at time of sighting is also given. —•— drogues with parachute at 50 m. 

 --■■—drogues with parachute at 5 m. 



S < 34.50%o, has evidently occurred since the 

 previous day when the B series of casts was 

 made. The low- salinity tongue seems to have 

 pushed further eastward into the high- salinity 

 water, in spite of the fact that the E series of 

 hydrocasts were west of the B series and were 

 made a day later. We are, however, not 

 absolutely certain of the exact relation of the 

 casts to the front. 



The salinity profile provides a fairly accu- 

 rate description of the interface between the 

 two kinds of water and agrees with the struc- 

 ture depicted by the data from the BT passes 

 (fig. 15), 



Thermosteric anom aly, 8j"--The 8x pro- 

 files of the B and E series of casts (figs. 21 

 and 22) are more or less similar to their 

 respective temperature profiles (figs. 17 and 

 18). There is a sharp increase in the depths 

 of some isanosteres (Montgomery and Wooster, 

 1954) near the "cool" station of the B series. 

 This is true of the isotherms and leads to a 

 strong correspondence, at the "cool" station 

 (5B3), between the thermocline and the pycno- 

 cline. There is no inversion in the Sxisopleths 

 (isanosteres) for the B series because the 

 temperature inversion is matched by a salinity 

 inversion in such a way that a stable density 



19 



