The ocean current velocities and directions were computed from the wind 

 data using the empirical relationships derived by Ekman (Sverdrup et al. 1946, 

 p. 494) and assuming that the wind forces acted instantaneously. The formula used 

 to compute the velocities was 



V = 0.0127 

 "Vain If 



where v m current velocity, W ■ wind velocity, and v « latitude. The direction was 

 obtained by applying the rule that the current is directed 45° to the right of the 

 wind in the Northern Hemisphere. 



During cruise 12 surface or near-surface current measurements were made 

 with the von Arx (19$C) GEK. The current vectors were corrected for the error due 

 to the difference in depth (droop) of the two electrodes. This correction con- 

 sisted of a vector directed towards the magnetic Equator. The magnitude of this 

 vector was dependent upon the ship's speed, the direction of the ship's motion, and 

 the amount of droop, and was computed by means of formulae derived by John Knauss 

 (personeil communication) .2/ 



HUGH M. SMITH CRUISE 1 



Cruise 1 of the HuRh M. Smith was planned primarily as a shakedown cruise 

 for the vessel, gear, and personnel. Therefore, the station pattern was designed 

 to take advantage of the lee provided by the island of Hawaii. Figure 1 is a chart 

 of the station positions. The solid lines indicate the lines along which cross 

 sections of bathythermograph temperatures (°r) , sigma-t, salinity (°/oo) , and dy- 

 namic topography (m. ) have been drawn. Stations 8A and 8B were occupied several 

 days before adjoining stations in the regular series, so their data were not used 

 in the analyses but are included in the tabulattd data. 



Since the discussion of the various fields of a water mass is more under- 

 standable when the general character of the flow pattern has been established, the 

 usual procedure of presenting the results of the cruises is reversed in this report. 

 The winds and computed currents are discussed first. This is followed by the dy- 

 namic topography and the geostrophic currents. Then the fields of temperature, 

 density, salinity, and dissolved oxygen are presented in the order named. 



iJ The magnitude of the droop was calculated from observations made at the 

 earth's magnetic equator on a later cruise. The formula used was 



"^c Hg 



d=t;h7s 



where D = droop 



S = distance between electrodes 



Vc = resultant signal vector 



▼s = speed of the ship 



Hh = horizonted magnetic field component 



H3 = magnetic field component set on the GEK. 

 Using the computed values of D, the magnitudes of the corrective vectors were then 

 computed by the formula, 



D Hh - 

 V = vt - vs— g- u 



where 



V = true current 

 Vt = current calculated 



u = unit vector in the opposite direction of Hj^ in the Northern Hemisphere 

 and the same direction in the southern. 



