Table 3, — Seasonal oxygen trends and ranges 



Winter 



Spring 



Summer Autumn 



General surface tend- 

 ency from heads to 

 entrances 



General surface 

 range (ml. /I. ) 



General bottom tend- 

 ency from heads 

 to entrances 



General bottom 

 range (ml. /I, ) 



Uniform horizontal 

 gradients 



General tendency 

 from surface 

 to bottom 



Vertical 



stratification 

 Station no. 11 (77 ft. ) 



None 



6.5-8.5 



None 



6.5-8.0 



No 



None 



1/ 

 None Increase None 



6.0-9.0 3.5-5.5 2.5-3.5 



1/ 

 None Increase None 



6.0-6.5 3.0-4.5 



No 



2/ 



None 



No 



3.0-3.5 



No 



3/ 

 Decrease None 



None None Light None 



-O.lml./l. -l.Oml./l. -1.3ml. /I 



1/ Except in Mt. Hope Bay and Providence River 



2/ Except in Providence River and upper East Passage where it decreases 



3/ Except in the Providence River near the bottom where it increases 



