Upon reaching the green antarctic waters, where organic 

 production is notably high in the summer, prominent well- 

 developed slicks were frequently observed, especially near 

 the pack (fig. 38A). Aerial observers who were questioned 

 reported generally good development of slicks in the antarctic 

 coastal waters. Frequently slick-like areas were noted in the 

 lee of melting ice. These areas appeared to have been caused 

 by the spreading of fresh water over salt water (fig. 38B). 



..-. 



FIGURE 38 Top: Slick-like patches developed in the lee of 

 melting brash ice. Such patches are often especially prominent 

 in the lee of melting ice bergs. They are probably formed by 

 relatively fresh water from the sea ice floating on sea water of 

 greater density. 



Middle: A typical development of slick patches during quiet sea 

 conditions in the antarctic. These slicks are probably largely 

 films of phytoplankton oil and thus show the high productivity 

 of these waters. 



Bottom: Slicks in San Diego harbor probably resulting from both 

 natural (diatom oil) sources and artificial (ship's oil and refuse) 

 sources. 



79 



