P aper 15 



EDDY HISTORIES 



1976 



Two eddies survived 1975 into 1976 (75E ana 751). Eddy 75E 

 (Fig. 15.1)/ first observed on 23 Jjly 1975 (Bisagni's ACE-10)/ 

 was off southern Delaware with an apparent surface diameter of 

 about 40 nm (70 km) at the start of 1976. An expendable 

 bathythermograph (XBT) survey on 18 February and 19 revealed a 

 maximum Core temperature of 13C extending to nearly 3C0 m depth 

 (Cook et al. 1976). This eddy coalesced with the Gulf Stream 

 about ll Karch . 



Eddy 7 

 not a 

 month 

 locate 

 (170 k 

 V i c i ni 

 17 Mar 

 and 15 

 detach 

 ex t ens 

 (Fig. 

 that 

 and 75 



51 (F 

 ppare 

 for t 

 d at 

 m) . 

 ty of 

 ch r b 

 .iJC) . 



ed f r 

 i V e 

 15.8e 

 eddy 

 I are 



ig^ 15. 

 nt in 

 wo mont 



o6W 

 After m 



6iiWr t 

 y enc ro 

 About 

 om the 

 patch 

 ) . Ano 

 751 was 



tue sa 



2)x 

 sate 

 hs u 

 with 

 ov i n 

 he e 

 ac hm 



1 A 

 Stre 

 of 

 t he r 



not 

 me . 



wh i c 



Hit 



nt i I 



an 



g so 



ddy 



ent 



pr i I 



am a 



Gulf 



pos 



des 



h f or Tte 



e image 



the en 



aopar 



ut hwes t 



appear e 



of a ou 



r part 



s anot h 



St rea 



s i b le i 



t royed 



d in 

 ry af 

 d of 

 ent 



abou 

 d to 

 If St 

 of th 

 er ed 

 no wa 

 nt erp 

 du r i n 



early 

 ter t 



J anua 

 su r f a 

 t 100 

 be la 

 ream 

 is me 

 dy (7 

 ter 

 ret at 

 g Mar 



Novem 

 he latt 

 ry 1976 

 ce d i a 



nm (1 

 roe ly d 



meande 

 ander a 

 6B) r in 

 at 67W 

 ion of 

 c h and 



be r 

 er p 



r wh 



mete 

 9G k 

 es t r 

 r ( 

 ppea 

 di ca 

 30" 

 the 

 that 



1975 

 art o 

 en i 

 r of 

 m) t 

 oy ed/ 

 Figs, 

 red t 

 ted 



on 7 

 image 



edd i 



/ was 

 f that 

 t was 



90 nm 

 o the 



about 



15.feb 

 have 

 as an 



A p r i I 

 r y is 

 es 76 F 



An XBT section from Albatross IV on 2-3 April (line AB in 

 Fig. 15.9) in the area of the warm patch indicates anticyclonic 

 circulation/ especially in the form of the isotherms for 12C and 

 colder/ but because of the section's placement/ does not 

 determine the feature as a meander or eddy/ although the thermal 

 structure does show a surface connection with the Gulf Stream. 

 The very steep thermal gradient at the inshore margin of the eddy 

 (Fig. 15.9) is based on the traces from three XBT probes dropped 

 near together in quick order. An additional XBT section along 

 line BC in the inset map on Figure 15.9 is not reproduced in this 

 report/ but shows a similar steeo thermal gradient (at 

 position C). An eastward current can be inferred on the offshore 

 side of the gradient. 



The hi 

 the sa 

 water 

 on a 

 en t r ai 

 (90 km 

 outer 

 the Ea 

 eddy . 

 westwa 

 imager 

 weeks. 



story 

 telli 

 pat ch 

 prot 

 nment 

 ). 



shelf 

 St war 

 ~If t 

 rd m 

 y/ an 

 Thi 



of edd 

 t e i mag 



of unc 

 r us ion 



around 

 T he pr 



SQUt h 



d on 1 1 

 he deep 

 u ch mo 

 d then 

 s eddy 



y 763 (F 



er y . Th 



er t a in c 



of She 



an eddy 



esence 



of New E 



-12 May/ 



1 3C wat 



re qu i c 



remained 



may have 



ig. 15.2) is not clearly apparent in 

 e 24 April position is based on a warm- 

 haracter. The 29 May position is based 

 If Water that has the appearance of 



with a surface diameter of about 50 nm 

 of 13C water to a depth >155 m over the 

 ngland (7lw12')/ in an XBT section from 



provided evidence of the passage of an 

 er was from this eddy/ then 76B moved 

 kly than was indicated by satellite 



in the area of 71«i/ for about three 



been the one that appeared in the area 



262 



