+ 2 



> 



i 



i 



i -i 

 i 



-2 



+ 2 

 + 1 

 

 -1 

 -2 



"i i i i i i i — i — i — r 



-NO OATH- 



IJU^JIJ 



.1.1 



UF 



H 1 1 1 1 1 1 1 1 1 1- 



ji m IMiin^li 



T 



nn 



n 



OBSERVED ■ ADJUSTED 

 J I Ml 1_ 



66 68 70 72 74 76 



Figure 5. — Observed and adjusted mean bottom-water temperature 

 anomalies in the northern Middle Atlantic Bight during spring 

 1968-76 and autumn 1964-76. The "O" base lines are based on the 

 seasonal time-series mean temperatures during each season. 



£ 12 



- 



1 1 



1 ' 



1 1 



1 I 



I'! 1 ! 



■ 



- 





A 



/ 

 / \ 



'As 



!/ V 





IjK/ 





- 



' ^J 



/ \ * 





T 

 / J 



^^13-YRX's 



- 



" 











AUTUMN 



OBSERVED 



ADJUSTED 



- 





1 1 



1 



! i 



1 I 



I i ! i I 





Figure 6. — Observed and adjusted annual and long-term mean 

 bottom-water temperatures in the northern Middle Atlantic Bight 

 during autumn 1964-76. 



trend over the data period (Fig. 7, Table 8). The lowest 

 and highest adjusted indices were 4.6°C in 1970 and 

 10.1°C in 1974 and the 9-yr mean was 7.5°C. Large year- 

 to-year differences were also prevalent among the 

 observed indices and except for 1970 when the spring 

 cruise was nearly a month later than average, the trends 

 are similar to the adjusted values. The lowest observed 

 index was 5.9°C in 1969 and the highest index was 9.9°C 

 in 1974. 



Summarization of the annual spring anomalies (Fig. 8, 

 Table 9) shows that all years before 1972 were below and 

 the remaining years to 1976 were above the 9-yr average. 



The two coldest years, 1968 and 1969, had no water 

 >12°C and relatively large amounts of water <4°C while 

 the warm years of 1972-76 had none of this cold water 

 and only moderate amounts of this warm water (Table 



CL 

 I 



is 



1 



o 



CD 



s 





1 1 



1 



I 



1 



i 



1 1 1 



A 





10 













A 





9 



" 







A 





/ V /, 



1 y/ 



- 



8 











# 





- 





P ^ 













9 



■ YR X's ^"^ 





7 



Ny 





V / 



1 

 1 



1 



1 



1 











6 



^ \ 

 \ 





1 



1 

 1 



> 





SPRING 



- 







/ 

 \ / 

 \ / 

 \ / 









OBSERVED 





5 



A 



1 i 



\/ 



V 



1 



1 







ADJUSTED 



1 , 1 





1968 



70 72 74 



YEAR 



76 



Figure 7. — Observed and adjusted annual and long-term mean 

 bottom-water temperatures in the southern Middle Atlantic Bight 

 during spring 1968-76. 



Table 8. — Observed and adjusted mean bottom-water temperatures 

 in the southern Middle Atlantic Bight during spring 1968-76 and 

 autumn 1967-76. 





x spring 



temperature (°C) 



x autumn 



temperature (°C) 



Year 



Observed 



Adjusted 



Change 



Observed 



Adjusted 



Change 



1967 





No data 





12.5 



12.6 



+0.1 



1968 



6.2 



6.7 



+0.5 



12.6 



12.9 



+0.3 



1969 



5.9 



6.4 



+0.5 



15.1 



15.3 



+0.2 



1970 



7.4 



4.6 



-2.8 



9.9 



12.1 



+ 2.2 



1971 



6.9 



6.1 



-0.8 



12.7 



12.7 







1972 



8.5 



8.9 



+0.4 



15.9 



15.7 



-0.2 



1973 



7.8 



7.6 



-0.2 



13.9 



13.6 



-0.3 



1974 



9.9 



10.1 



+0.2 



13.9 



13.6 



-0.3 



1975 



8.1 



8.5 



+0.4 



13.9 



15.0 



+ 1.1 



1976 



8.8 



9.0 



+0.2 



14.0 



14.0 







Mean 



7.7 



7.5 





13.4 



13.8 





3). On the average the TCI distribution did not vary 

 much in the 4°-12°C range but was slightly dominated 

 by the 6°-8°C TCI. 



Autumn 1967-76. — The observed, adjusted, and 10-yr 

 mean bottom-water temperatures are shown in Figure 9 

 and illustrate the extreme variations that occurred in the 

 Southern Bight during the autumn series. Except for 

 1970 and 1975 when the cruises were about 30 days before 

 and 20 days after the autumn reference date, the 

 observed and adjusted values were relatively equal and 

 show the same variability. The largest decreases (5.2°C 



