strong break in the northwest wind regime in which the coastal upwelling, 

 which had continued since April, was briefly replaced by downwelling. It 

 seems probable that the launch of this feature to the west may be related to 

 this wind event. 



Other fainter features are visible further offshore in the clearer, less 

 pigmented water. Velocities here are 8-10 km day' to the southwest. 



The areas of high chlorophyll pigments (light tones in 23-1) indicate 

 areas of high summer planktonic production which imply potential food 

 sources for young salmon. These salmon are known to feed in the area 

 during summer months on their journey to the open ocean where they 

 spend their adult life. The areas adjacent to the eddy E2 also support a 

 large adult salmon fishing industry. The information on surface dynamics 

 is extremely valuable in showing the water movements which cause and 

 modify the distribution of these food sources. This example demonstrates 

 how the CZCS imagery can provide this information where the absence of 

 strong temperature contrasts makes infrared imagery of little value. 



References 



Freeland. H. J., and K. L. Denman. 1982: A topographically-controlled upwelling center 



off Vancouver Island. J. Marine Res., 40, 1069-1093. 

 Thomson, R. E., 1984: A cyclonic eddy over the continental margin of Vancouver Island: 



Evidence for dynamic instability. Submitted to the / Phys. Oceanogr. 



23-1. Enlarged View. Nimbus-7. Orbit 3643. 14 July 1979. CZCS Pigment Image with depth contours. 



23 



