Table 5.— Gulf Stream crossings by SOOP vessels in 1974. 



Appendix 







Position 



figure 



Ship 



Date 



(lat., long.) 



21 



Mormac Argo 



5-6 May 



38°30'N, 71°12'W 



22 



Santa Cruz 



17-18 May 



31°48'N, 79°06'W 



23 



Santa Cruz 



11-12 June 



38°12'N, 73°57'W 



24 



Santa Cruz 



28 July 



34°48'N, 75°24'W 



25 



Mormac Rigel 



14 Aug. 



37°42'N, 70°48'W 



27 



Santa Cruz 



3-4 Sept. 



^"SCN, 75 o 00'W 



29 



Export Defender 



1 Oct. 



36°42'N, 72°18'W 



30 



Mormac Rigel 



3 Oct. 



37°30'N, 71°00'W 



31 



Santa Cruz 



9-10 Oct. 



36°12TSI, 74°12'W 



32 



Santa Cruz 



19 Oct. 



35°00'N, 75°00'W 



34 



Export Defender 



27-28 Nov. 



36°00'N, 74°00'W 



35 



Santa Cruz 



7-8 Dec. 



Se-OCN, 75°18'W 



SOOP transects. However, since the N-69 charts are 

 derived solely from remote sensing of sea surface tem- 

 peratures and The Gulf Stream Monthly Summary is at 

 least partially dependent upon these data, the patterns 

 shown by these publications may not be as accurate as 

 those portrayed from subsurface temperature data. The 

 information collected by the SOOP affords an excellent 

 source with which these data can be verified. 



Table 6 shows the Gulf Stream positions as deter- 

 mined from each source. In each case, the distance has 

 been measured along identical bearing lines and this dis- 

 tance converted to nautical miles. Several sources of 

 error were apparent. The inconsistent quality of 

 reproduction of N-69 charts and the distortion in- 

 troduced by photocopying lead to some uncertainty in 

 measurements. In addition, some interpolation was 

 necessary to locate positions between stations on ver- 

 tical sections. Interpolation was also necessary to deter- 



mine positions during mid-month from The Gulf Stream 

 Monthly Summary because positions were given only at 

 the beginning and end of the month. An estimate of these 

 errors accompanies each measurement. 



Within the estimated range of measurement errors, the 

 sources agreed closely on the positions of the Gulf Stream 

 North Wall. Only in May was there a significant dif- 

 ference in the measurements. The distance offshore to 

 the North Wall measured from The Gulf Stream 

 Monthly Summary was about 40 nautical miles greater 

 than the distance determined from SOOP data when 

 superimposed on the N-69 charts. 



Eddies. — From analysis of the vertical sections con- 

 tained in this report, four Gulf Stream eddies were 

 detected during 1974 (see Table 7 and Fig. 10). Eddy #1 

 (Appendix Fig. 19) was crossed by Santa Cruz on 5-6 

 May and was centered at station 7 (lat. 32°00'N, long. 

 75°00'W). The sloping of the isotherms indicated an 

 asymmetrical cold core eddy, possibly becoming en- 

 trained in the Gulf Stream. The Gulf Stream Monthly 

 Summary (April) showed an eddy centered at lat. 

 SS'OO'N, long. 74°00'W on 30 March 1974. Since the eddy 

 was not shown in the May issue, it may have become en- 

 trained during the interval. This eddy was not shown on 

 the N-69 charts. 



On 5-6 May (Appendix Fig. 21) Mormac Argo crossed a 

 cyclonic, cold core eddy (Eddy #2) that was centered 

 around station 8 (lat. 36°00'N, long. 68°00'W). The 

 structure of the eddy was evident to a depth of about 600 

 m and the width at the surface where transected was ap- 

 proximately 145 nautical miles (269 km). The May issue 



Table 6.— Comparison of Gulf Stream position in 1974 as located by SOOP, NESS N-69 charts, and The Gulf Stream Monthly 



Summary. 





SOOP 



Distance 



N-69 Charts 





Gulf Stream 





Appendix 





Distance 





Distance 



figure/date 



bearing line 



nm (km) 



Date/Bearing line 



nm (km) 



Date/Bearing line 



nm (km) 



21 



Sandy Hook 



171±12 



4-7 May 



155±35 



May 



235±10 



5-6 May 



ISO- 



(317±22) 



Sandy Hook 130° 



(287±65) 



Sandy Hook 130° 



(435±19) 



22 



Charleston 



87±10 



Cloud Cover 



— 



May 



34±12 



17-18 May 



147° 



(161±19) 







Charleston 147° 



(156±22) 



23 



Cape Charles 



118±15 



6-10 June 



90±15 



June 



100±18 



11-12 June 



124" 



(219±28) 



Cape Charles 124° 



(167±28) 



Cape Charles 124° 



(185±33) 



24 



Cape Charles 



140±25 



Cloud Cover 



— 



July 



144±10 



28 July 



170° 



(259±46) 







Cape Charles 170° 



(267±19) 



25 



Sandy Hook 



222±15 



15-20 Aug. 



225±10 



August 



215±24 



14 Aug. 



137° 



(411±28) 



Sandy Hook 137° 



(417±19) 



Sandy Hook 137° 



(398±44) 



27 



Cape Charles 



132±15 



4-10 Sept. 



120±10 



September 



115±10 



3-4 Sept. 



161° 



(245±28) 



Cape Charles 161° 



(222±19) 



Cape Charles 161° 



(213±19) 



29 



Cape Charles 



174± 6 



27 Sept.-l Oct. 



165±15 



October 



150±10 



lOct. 



95° 



(322±11) 



Cape Charles 95° 



(306±28) 



Cape Charles 95° 



(278±19) 



30 



Sandy Hook 



225± 6 



4-6 Oct. 



230±20 



October 



210±10 



3 Oct. 



137° 



(417±11) 



Sandy Hook 137° 



(426±37) 



Sandy Hook 137° 



(389±19) 



31 



Cape Charles 



120±20 



11 Oct. 



95±10 



October 



120±10 



9-10 Oct. 



128° 



(222±37) 



Cape Charles 128° 



(176±19) 



Cape Charles 128° 



(222±19) 



32 



Cape Charles 



120±10 



18-22 Oct. 



120±15 



October 



125±12 



19 Oct. 



161° 



(222±19) 



Cape Charles 161° 



(222±28) 



Cape Charles 161° 



(232±22) 



34 



Cape Charles 



102± 6 



21-24 Nov. 



91±15 



November 



100±10 



27-28 Nov. 



140° 



(189±11) 



Cape Charles 140° 



(169±28) 



Cape Charles 140° 



(185±19) 



35 



Cape Charles 



100±50 



5-10 Dec. 



135±12 



December 



121±10 



7-8 Dec. 



163° 



(185±93) 



Cape Charles 163° 



(250±22) 



Cape Charles 163° 



(224±19) 



