to 



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 a. 



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 -o 



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 X 



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FEBRUARY 



Figure 10.— Winter mean temperature sections (°C) (194()-6li) for the 

 Gulf of Maine between Bar Harbor, Maine, and Yarmouth. Nova 

 Scotia, from Chamberlin et al. (1976). 



Figure 1 1.— .Spring mean temperature sections (°C) (1940-66) for the 

 Gulf of Maine, and Yarmouth, Nova Scotia, from Chamberlin et al. 

 (1976). 



•c 



15 

 14 

 13 ■ 

 12 • 



11 - 

 10 



9 



8 



7 - 



6 



44" 15' N , 67' 58' W COASTAL MAINE 

 44*00' N, 67°16'W CENTRAL GULf 

 43'47'N 66*30'W COASTAL NOVA SCOTIA 







Figure 



12. — Sea surface temperature (°C) at three locations (Fig. 1) across the Gulf of Maine, June 1 975-November 1976. 1976 Summer and 



Autumn data indicated by "76". 



Central Surface Waters 



In the central surface waters the thermocline 

 developed in April and May with warming (>2°C per 

 month) into August. The warming rate slowed in August 

 as temperatures neared the yearly maximum. Maximum 

 temperatures were reached in late August to mid-Sep- 

 tember, with temperatures 1° to 2°C higher than coastal 

 waters. It is probable that most solar radiation is 

 restricted to heating above the thermocline in this region 

 with little downward mixing by wind or currents. Bum- 



pus and Lauzier (1965) showed the central area to be part 

 of the counterclockwise gyre circulation of the Gulf of 

 Maine during summer. Vertical mixing occurred in the 

 autumn with breakdown of the thermocline by Novem- 

 ber. Rapid c(K)ling and homogeneous conditions char- 

 acterized the winter, with minimum temperatures 

 observed in January. Again, seasonal trends and tem- 

 perature structures for 1975 and 1976 were similar to 

 historical data, with the exception that minimum tem- 

 peratures historically occurred in March. 



