Figure 18.--Vertical distributions of properties on cruise TO-59-1. parts 1 and 2, along section A- A (see fig. 15); 

 depth scale in m. 



are comparable with those that prevailed in 

 May and June on cruise TO-58-1. 



Horizontal distributions of properties 



Figure 21 is a set of charts of: (A)dynamic 

 height anomaly and surface current, (B) sur- 

 face temperature, (C) surface salinity, (D) 

 phosphate at 30 m., and (E) zooplankton and 

 micronekton. There is no chart for oxygen 

 because surface conditions were uniform for 

 this property, as noted on figure 21C. 



Figure 21A shows a more meridional dy- 

 namic topography than was noted on other 

 cruises. The crest of the ridge was between 

 950 and 940, as in figures 4A and lOA. Surface 

 current agreed reasonably well with geo- 

 strophic current except south of 140. 



Surface temperature was more uniform than 

 on any previous survey (fig. 21 B). The general 

 location of the coldest area was the same as 

 previously, centered at about 15° N., 95° W. 

 Temperatures generally were still higher 

 than the long-term average for the month. 



Figure 21C indicates the extension of water 

 of salinity >33.8°/oo to the surface in part of 

 the ridge region, through a surface layer of 

 generally lower salinity in the northern and 

 eastern parts of the Gulf which was probably 

 a result of dilution by waters run off from 

 the coast. There was a north-south ridging 

 of the isopleths of phosphate along 95° W., 

 but not reaching the head of theGulf (fig. 21D). 

 Standing crops of zooplankton (and probably, 

 from the meagre evidence available, of micro- 

 nekton) were lower than on any previous 

 cruise, although for this cruise the highest 



22 



