Patrol. Soule and Graves (1938) aboard CGC 

 GENERAL GREENE surveyed this section 

 from 39°04'N to the "Tail-of-the-Banks." Vol- 

 ume transport calculations in their report were 

 based on a 2000 decibar reference level. The 

 subsequent occupations of this section were by 

 CGC EVERGREEN in 1950, 1958, and 1960. 

 The 1950 cruise extended from 38° north 

 latitude to the "Tail-of-the-Banks." This oc- 

 cupation did not extend across the North 

 Atlantic Current (Soule and Barnes, 1950), 

 although it was in conjunction with Operation 

 Cabot, a five ship survey of the Gulf Stream, 

 (Fuglister and Worthington 1951). In 1958, 

 it was occupied as a part of the activity of 

 the International Geophysical Year. Sampling 

 commenced at 38° 30' north latitude and ex- 

 tended to the "Tail-of-the-Banks." In this 

 instance one section was at 48°30' west lon- 

 gitude and the other at 50°15' West longitude. 

 These occupations occurred significantly earlier 

 in the spring than the other occupations. 



In 1966, a single occupation of Standard 

 Section 4 was conducted from 23 to 25 May 

 1966. The vertical temperature and salinity 

 structure observed are shown in Figures 52 

 and 53. A chart of the dynamic topography for 

 this cruise relative to the 1000 decibar refer- 

 ence surface is shown in Figure 3. This ref- 

 erence surface is too shallow to adequately 

 represent the velocity of the Gulf Stream, but 

 it is useful in showing the current pattern 

 with respect to the other sections occupied 

 during the cruise. 



Between stations 9562 and 9563 some sub- 

 jectivity was involved in contouring the iso- 

 therms. The decision that had to be made was 

 whether there was an isolated core or whether 

 there was a tongue that connected to water of 

 the same temperature at greater depths. 



A strong horizontal temperature gradient 

 occurred between stations 9561 and 9560, but 

 no surface temperatures were available; hence, 

 the surface intersections of these isotherms 

 were then drawn without any near surface 

 temperature information. The cross stream 

 thermocline slope that delineated the North 

 Atlantic Current was also apparent, e.g., the 

 10° C isotherm sloped downward from the 

 surface to 928 meters at station 9552. 



The vertical temperature and salinity struc- 

 ture observed during the 22-24 May 1966 oc- 



cupation showed more cold water than the 2-3 

 April 1966 observations. The minimum tem- 

 perature of 2.00° C observed on the 2-3 April 

 1966 occupation was at the bottom of station 

 9515, and the minimum salinity of 33.68%o was 

 at the surface. An interesting secondary tem- 

 perature minimum of 2.89° C occurred at 95 

 meters on station 9511. The maximum surface 

 velocity observed in April was between sta- 

 tions 9512 and 9511. The 22-24 May occupa- 

 tion showed some character with the 2.0° C 

 isotherm delineating the structure of a cold 

 core. The minimum temperatures observed in 

 the Labrador Current were warmer than 

 normal. This was also observed in the Stand- 

 ard Section 2 occupations. 



LABRADOR SEA SECTION 



The International Ice Patrol has occupied 

 the Labrador Sea Section 28 times since 1928. 

 In addition, two other occupations were made 

 by the GODHAAB and the METEOR in 1928 

 and 1935 respectively. Dinsmore, Morse, and 

 Soule (1960) summarized the volume trans- 

 ports of the Labrador Current across Standard 

 Section 1 for this period. Bush, Murray, and 

 Soule (1957) summarized the volume trans- 

 ports of the Labrador Current across Standard 

 Section 1 and the West Greenland Current off 

 Cape Farewell, Greenland. Cheney and Soule 

 (1951) presented the mean values of the 

 Irminger and East Greenland Current compo- 

 nents of the West Greenland Current. Bullard, 

 et al. (1963) presented the mean Irminger 

 and East Greenland components of the West 

 Greenland Current. 



The dynamic topography of the surface ob- 

 served along this section in 1966 is shown in 

 Figure 54. As is the case with an isolated sec- 

 tion, this indicates the component of the total 

 current normal to the section and provides no 

 information about the true direction of the 

 current. This figure is useful in delineating the 

 location and extent of the steeper gradients. 



The vertical distribution of temperature 

 and salinity are shown in Figures 55 and 56. 

 The presence of storis immediately west of 

 Cape Farewell, Greenland prevented the occu- 

 pation of the planned eastern stations and this 

 occupation of the Labrador Sea Section did not 

 extend across the entire breadth of the West 

 Greenland Current. 



13 



