Currents 



105 



Figure 91. Top, maps show- 

 ing depths to 50 per cent 

 Southern Water during Ma- 

 rine Life Research cruises of 

 February and July 1950; 

 computed according to the 

 method of Figure 90. None 

 indicates that Southern Wa- 

 ter is less than 50 per cent at 

 all depths sampled. Middle, 

 percentage of Southern Wa- 

 ter in zone of mixing between 

 200 and 500 meters for same 

 two cruises; computed ac- 

 cording to the method of Fig- 

 ure 90. Bottom, dynamic 

 topography at 2-cm contour 

 interval for 300-meter surface 

 with respect to 800-meter 

 level. Arrows show direction 

 of current, and the spacing 

 of contours is an inverse 

 measure of current velocity 

 according to the velocity 

 scale on the map at lower 

 left. 



Figure 92. Temperature section 

 between Santa Barbara Island 

 and Santa Monica, showing 

 mixed layer at surface, ther- 

 mocline, and underlying zone 

 of gradually decreasing tem- 

 perature on June 26, 1957. 

 Within the latter zone are sev- 

 eral widespread temperature 

 inversions amounting to nearly 

 1°F; these may correspond to 

 incomplete mixing between 

 Northern Water at the top and 

 Southern Water below. From 

 Gunnerson (1957fl). 



