Smith 



Fig. 4 - Temperature structure as recorded by the NEL 

 Thermistor Chain between points H and I (Figs. 2 and 3) 

 during 1964 eddy study. Dashed line shows asymmetry 

 and eastward trend of eddy apex. 



but appears asymmetric about a vertical center. The vertical axis 

 of the dome points eastward. The average isotherm slope is steeper 

 to the east and, hence, the horizontal temperature gradient is strong- 

 er to the east than to the west. The 26° C isotherm is forced to the 

 surface on each side of the dome and further displays asymmetry. 

 The small-scale vertical variations in this temperature structure are 

 somewhat masked because of the necessary horizontal scale compres- 

 sion. However, most vertical variations in these temperature struc- 

 ture data are 20 to 30 feet with wavelengths of 0. 5 to 1. 5 miles. 

 This type of structure has been shown to be common for this region 

 and other areas of the ocean (Smith, 1967). 



The thermal structures along the two center legs of the track 

 (F to G and H to I) were measured again (R to S and T to U) 10^ days 

 later. For comparison with track leg H to I, figure 5 shows the 

 temperature structure for track leg R to S. It can be seen that the 

 dome in the structure is better developed and is more symmetric 

 about a vertical center. The most important feature is the migration 



401 



