Currents 



107 



Figure 94. Relationship between dissolved oxygen and 

 phosphate-phosphorus for all depths at stations of the 

 Marine Life Research cruise of February 1950. Data for 

 other cruises in the area are essentially identical. Data 

 for waters south of latitude 31°30' fall at the upper left 

 of the plot and for waters north of latitude 34°30', at the 

 lower right. Note the inverse relationship of the two 

 parameters. 



I lies below the sill depths of the basins. 

 The properties of the water in each basin 

 are unique to that basin but are similar to 

 those at some depth in the overlying inter- 

 mediate and surface waters. The most 

 characteristic properties are temperature 

 and oxygen content; salinity and nutrients 

 are more nearly uniform in the various 

 basins (Table 7). 



In the open sea the water temperature de- 

 creases with depth except for local minor in- 

 versions mostly near the surface. In each 

 basin, however, the temperature is nearly 

 uniform from near the sill depth to the bot- 

 tom (Fig. 96) (Emery, 1954c). Temperature 

 at the sill of each basin is approximately the 

 same as that of the open sea at the depth of 

 that sill. The water in several basins pre- 

 sents a decrease of temperature of not more 

 than 0.13°C in the first hundred meters 

 below the sill, presumably because of mix- 

 ing with the overlying intermediate water. 

 Below that depth, at least in Santa Cruz 

 and Velero Basins, there is a slight increase 



Figure 95. Relationship be- 

 tween phosphate-phosphorus 

 and water temperature for 

 same cruises and depth range 

 as those in Figure 91. Percent- 

 age of Southern Water is shown 

 by solid lines for February and 

 by dashed lines for July. 



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