Paper 18 



changed to a significant intrusion in Late November. Inspection 

 of the weekly charts showed that during this periods the Gulf 

 Stream had meandered offshore and a relatively larqe area of 

 Slope Water forced the Shelf Water front to impinge on the coast. 



MONTHLY MEAN FRONTAL POSITIONS 



The monthly mean frontal positions are shown in 

 the three complete years of data collection 

 exercised in interpretation since the number of 

 varies (due to lack of data because of clouds^ 

 occasionally only one weekly value was available for 

 ( about 5% of the time). 



Figure 



Care 



weeks 



18.6 for 



should be 



averaged 



etc.) and 



t he mont h 



Definite tendency for seasonalit 



the other bearing 



somex there was little indication of it- The Cape 



May and Cape Henry bearing lines show little seasonal variation/ 



to be affected by shorter period fluctuations and 



Seasonal variation was not as consistent on 



Lines and on some/ there was little indication of it- The Cape 



but seem 



but seem to oe aTTected by shorter penoa TLuctuations and 

 aperiodic occurrences. The Albemarle Sound besring line showed a 

 seasonal cycle in 197A ana 1975/ being onshore the first part of 

 the year and offshore the Latter/ but it did not show this cycle 

 in 1976. 



The three southern bearing Lines suffer from gaps in the data/ 

 making it difficult to determine if seasonal variations do indeed 

 exist on these bearing lines. The three bearing lines do 

 correlate well among themselves/ however/ suggesting that they 

 are affected biy similar events. 



YEARLY MEAN FRONTAL POSITION 



The yearly mean shelf front position for 1976 agreed well with 

 the position for the previous two years (Table 18.1/ Fig 18.7a). 

 Except for Casco Bay 120 and Sandy Hook/ the 1976 positions were 

 close to those for 1974 and 1975. The Casco Pay 12C mean 

 position was considerably more seaward (about AO km) and the 

 position for Sandy Hook was slightly more shoreward (about 



304 



