Average differences in dynamic height between various depths 

 are presented below in dynamic centimeters: 



Depth Interval Average Dynamic Average Number of 

 (Mete rs) _^ Height Differences Deviation Range Stations 



0-250 83 U.6 69-°5 21 



. 250-500 39 2.3 33~li9 21 



50Q-8QO 33 3.25 27-U9 20 



800-1200 26 2.6 18-U0 18 



The largest proportion of flow, as well as the fastest, takes place 

 in the top 250 meters. The values compare favorably with those of 

 Parr (1936) for the entire Caribbean area survey in 1933 and 193U. 



II. GEK OBSERVATIONS 



It is important to state that the GEK is a spot observation which 

 measures not only current resulting from general circulation, but also 

 transient wind-driven and inertia currents. However, in the case of 

 the USS PURSUIT data, an attempt to correlate current directions with 

 local meteorological conditions met with little success, especially 

 where discrepancies with ATLANTIS observations appear. The dis- 

 crepancies are obvious, and since with two exceptions the USS PURSUIT 

 GEK's were taken first, with a minimum time difference of 3 days when- 

 ever the two ships took observations at the same positions, it is 

 concluded that the variations are significant, depicting tho cir- 

 culation prevalent at the time of observation. The two exceptions 

 are USS PURSUIT GEK's 13-lU and 15-16, with speeds exceeding one knot. 

 These were taken within an hour or two of ATLANTIS observations at the 

 same locations, where the latter found equally strong currents running 

 in opposite* directions. It is believed that the electrodes on the 

 USS PURSUIT'S GEK were connected in reverse at these stations which 

 v:ould account for the 180° discrepancies. This belief is supported 

 in part by the USS PURSUIT boat sheets which show a calculated drift 

 of 2.8 knots setting 167° T at the location of GEKs 15-16, but a drift 

 of ,kh knot setting 329° T at GEKs 13-llio Credence is accorded the 

 ATLANTIS data, since the ATLANTIS GEK's were supported by additional 

 observations with drogues. The remaining USS PURSUIT GEK's are sub- 

 stantiated by calculated current direction and ship's drift and by 

 ATLANTIS data o 



It is believed that the circulation was in a state of flux at 

 the initiation of the USS PURSUIT survey, while the ATLANTIS found 

 an established system (the reverse of the accepted pattern) which 

 began shifting before her departure. By the time the USS SAN PABLO 

 surveyed the area 6 weeks later, the system of east-to-west movement 

 was re-established. Figures 6, 7, and 8 show tho GEK data obtained 

 by the three ships. 



