Smaller thermal pockets were noted when observations 

 were taken every 3 minutes (fig. 43). Thermal pockets 2 de- 

 grees F warmer than adjacent water were found to be as 

 small as 5 feet thick and less than 150 feet long. In all cases 

 the pockets were just above the main thermocline. 



2000 2200 TIME (GCT) 



Figure 42. Fluctuations in vertical temperature structure (degrees F ) from repeated bathythermograph 

 observations for 24 hours at station N17 in the brash ice region (72° 07' N to 71° 54' N, 67° 57' W to 

 167° 40' W). 



V/7777-/}V777-/77777r/7777/7777/777/?77>77Z/7777-/77^ 



0300 TIME 

 (GCT) 



Figure 43. Fluctuations in vertical temperature structure (degrees F ) from rapidly repeated bathythermo- 

 graph observations for one hour at station N17 in the brash ice region (72° 04' N, 167° 56' W). 



