40»N 



J I L 



J__J L 



40*N 



54'W 92» 



90* 



48* 



46* 



44»W 



Figure C-4 Field of standard deviation of dynamic height of the indi- 

 vidual surveys from the April normal. Contour interval is 1 dyn-cm 

 (from Scobie and Schultz, 1976). 



radar image as tonal changes. 

 Thus, there are light and dark 

 areas on the images that corre- 

 spond to differences in the re- 

 flected radar energy. 



Interpretation of the images 

 requires an understanding of how 

 wind stress, current gradients, etc. 

 modulate short gravity waves on 

 the ocean surface; but, our 

 understanding is poor. Lichy et al. 

 (1981), who tracked a warm core 

 ring using SEASAT SAR data, 

 found that within the warm water 



there was a rrrore intense radar 

 return than from the surrounding 

 area. 



This paper describes the results of 

 a study of the circulation east of 

 the Grand Banks of Newfound- 

 land. Its goals were to collect 

 surface-truth data for comparison 

 of the remotely-sensed SLAR data 

 and to investigate the effects of 

 NAC meanders and eddies on the 

 flow of the Labrador Current. Our 

 intent was to locate a front using 

 SLAR, examine the water property 



distribution and dynamics in the 

 vicinity of the front with the ship, 

 and compare the two. MP's long- 

 term goal is to use remote-sensing 

 techniques to aid in iceberg 

 movement prediction. IR imagery 

 shows little promise near the 

 Grand Banks because of clouds, 

 but much can be learned from 

 SLAR imagery. That information 

 will help interpret future satellite 

 SAR data and the occassional IR 

 image. 



56 



