A horizontal eddy appears on the eastern section as a deep penetration 

 of warm water at about 12|-°No The existence of this eddy is substantiated 

 by further evidence which is discussed in ensuing sections of this report. 



At the top of the diagrams j the surface temperature is plotted 

 according to the inset temperature scale » To draw this curve, surface 

 temperature observations were plotted and a smooth curve drawn with the 

 aid of records of the recording thermograph which was in continuous 

 operation during the cruise „ These curves indicate warm surface water at 

 the southern end of the station lines and relatively cold surface water 

 at the equator o From the equatorial region northward the sea surface 

 becomes gradually warmer to about 7^ but sudden increases occur near 

 2*^ along the western section and near l.^^ along the eastern o These 

 rapid changes in the sea surface temperature over very short distances 

 have the appearance, almost j of discontinuities on the thermograph trace. 

 It is interesting to note that on the western section this pronounced 

 "discontinuity" occurs immediately over a deepening of the homogenous 

 surface layer o No reasonable smoothing of the thermocline deoth or the 

 65°., 70° and 75° isotherms would eliminate this relationshipo The 

 temperature "discontinuity" must be the result of a convergence in the 

 surface cxirrento Sinking of surface water would result, and this view 

 is consistent with the deepening of the thermocline. On the eastern 

 section this relationship is somewhat less clearly defined. There are 

 apparently two or three "deepenings" of the thermocline associated with 

 a relatively broad region of rapid surface temperature change which includes 

 a small "discontinuity". This situation is believed to result from a less 

 pronounced convergence with a broader region of sinking than at the western 

 convergence. 



From 7°N the surface temperature decreases northward, A third sudden 

 change in the surface temperature was noted on the thermograph trace at 

 about 142"^N along the eastern line of stations and is possibly associated 

 with the horizontal eddy circulation. The three sea surface temperature 

 "discontinuities" described above are the only ones which appeared along 

 the station lines =, 



Current Sections ( Figs, 6 and 7) s 



The relative currents shown in Figs, 6 and 7 were computed from the 

 smoothed profiles of Figs« 2 and 3 by means of the geostrophic formula; 



V g 10^ (^da-adb) 



L 2 o Sin i!> 



where ^^A" A.DB=--difference in dynamic height anomalies at 



two hydrographic stations, A and B, 



L ■ distance between stations A and B, 



^ ^ angular velocity of the earth's rotation (0,729x10 radians 

 per sec) 



and P B mean latitude between stations A and B, 



If cgs units are used, v is given in cm„per,sec. Because of the uncertainty 



4 



