Paper 15 



of Deepwater tjumpsite 106 (38NA3 ' -39N00 ' r 72W00 •-72W30 ' ) at the 

 end of June as shown by several XbT sections.' After Mayr 

 however^ the history of the eddy was not revealed in satellite 

 imagery. 



Eddy 76A formed about 22 February from a large meander centered 

 at 63 w (Figs. 15. 3x 15.8a/ 15. Bb). The large decrease in appar- 

 ent surface diameter of this eddy froti 140 nm (260 km) at the end 

 of February to 1C0 nm (190 km) at the end of March was probably a 

 result of deceptive surface expression. A hydrocast transect 

 from the RV Ernst Haeckel made on 20 March (Fig. 15.10) showed 

 this eddy to be a smoothly structured mass of Sargasso Water/ 

 with a sigma-t range of only 25.9 to 26.3 at stations 1 to 4 

 (except in a few of the deepest samples at stations 2 and 4). 



A special set of diagrams (Fig. 15.8) 



illustrate i/iajor interactions between 



anticyclonic eddies in the area southeast 



mid-February through April, Involved in 



two large changes of course by the Stream 



eddies 751 and 76A/ as well as the formation and destruction of 



cyclonic eddy. 



has been prepared to 

 the Gulf St ream and 

 of Georges Bank froti 

 these interactions were 

 ana the destruction of 



a 



On 17 February (Fig. 15.8a)/ eddy 751 lay south of Georges 

 Bank/ and a Gulf Stream meander was separating as eddy 76A. 



On 28 February (Fig. 15. bb)/ eddy 751 was entraining warm 

 Gulf Stream water/ and eddy 76A was fully formed and had 

 moved wes t wa rd . 



By 24 March (Fig. 15.8c)/ a developing Gulf Stream meander 

 had encroached on eddy 751/ apparently destroying it. Eddy 

 76A moved westward and entrained warm Gulf Stream water. 



By 27 March (Fig. 15. 8d)/ 3ulf Stream water was 

 from the meanoer south of Georges Bank as eddy 

 76A ceased entraining Gulf Strean water and was 

 losing kater to the Gulf Stream. I^eandering of 

 intensified southeast of eddy 76A. 



separ at i ng 

 76B. Eddy 

 apparent ly 

 the St r eaii 



By 7 April (Fig. 15. 8e)/ eddy 763 had separated from the 

 Stream south of Georges bank and had moved westwaro. The 

 Gulf Stream changed course through the northern portion of 

 eddy 76A/ forming a broad meander that incorporated this 

 eddy. Tti e former path of the Stream to the south became a 

 cyclonic eddy. A hydrocast transect from the W^eczno made 



J. J. Bisagni/ Atlantic Environmental 

 sett/ Rl 02b£d. Pers. commun. 



Group/ NMFS/ Narragan- 



263 



