DYN. MM 



3550 



FIGURE 23. — Dynamic height as a function of time, 

 period and 4-iiim. amplitude. 



28 



Ihe maximum and minimum salin- 

 ity with the average temperature 

 to derive the saHnity effect. 



In order to reduce as far as pos- 

 sible the total elapsed time covered 

 by the occupation of the oceanogra- 

 phic stations and still have a reason- 

 ably close vertical spacing of the 

 observations, the compromise adop- 

 ted resulted in a maximum common 

 depth of observations of only about 

 140 meters. The 140-decibar sur- 

 face therefore was selected as a 

 reference surface for portrayal of the 

 relative dynamic topography of the 

 sea surface and is shown in figure 

 22. Here the differences in dynamic 

 height are materially greater than 

 those which might appear as the 

 result of systematic errors in tem- 

 perature and salinity measurements 

 and as the distances are short the 

 resulting gradients correspond to 

 velocities in excess of reasonable 

 values, up to the order of about 3 

 knots. 



Referring again to figures 18 and 

 19, in the former the first and last 

 bathythermograph casts, 301 and 

 314, were made in the same loca- 

 tion relative to the berg. Some of 

 the intermediate isotherms were 

 found at different levels in these 

 two casts, but their mean depths 

 were used in preparation of figure 

 18 as the means seemed in good 

 agreement with adjacent slides. In 

 the case of figure 19, the first and 

 last casts (315 and 322) were not in 

 the same relative position with re- 

 spect to the berg and the isotherms 

 were drawn in accordance with 

 the depths registered. Thus there 

 seemed a possibilit\' that the obser- 

 vations at the oceanographic sta- 

 tions, which covered an elapsed 



-liowinK effect of introducing harmonic of (i-hour 



