south at section F, while the volume transport and mean tem- 

 perature were still above normal, they were much less so than 

 in the first survey. The coldest water, however, continued to have 

 a positive anomaly only slightly less than in the first survey. 



In the third survey section F continued to have about the 

 same positive anomaly of volume transport as in the second sur- 

 vey, but the additional water making up the seasonal increase in 

 volume was of warmer water, increasing the anomaly of mean 

 temperature to -j-0.6. The minimum temperature dropped to more 

 nearly the seasonal normal. 



The postseason occupation of the Bonavista triangle again showed 

 a large positive anomaly in volume transport but less than during 

 the occupation of the second survey. Minimum temperatures were 

 about normal, but the mean temperatures were decidedly abnor- 

 mal. The northwestern section was below normal in mean tem- 

 perature, largely because the water below about 400 meters in 

 the offshore end of the section where the water is relatively warm 

 (about 3.5°) was motionless. The other two sections were 

 above normal in mean temperature, resulting in a computed excess 

 of heat leaving the triangle over that entering of about 7.2 X 

 10 6 m 3 °C/sec. It will be noted that in each occupation of the 

 triangle the computed volume transport leaving the triangle (SW 

 + SE) exceed that entering the triangle (NW) by about 1.1 X 10 6 . 



The section off South Wolf Island, Labrador, occupied imme- 

 diately following the Bonavista triangle on the postseason cruise, 

 again showed a warmer minimum observed temperature than that 

 found at the triangle. The volume transport of the Labrador 

 Current here was well above normal as was the volume of the 

 West Greenland Current off Cape Farewell. The mean tempera- 

 ture of the Labrador Current off South Wolf Island also was above 

 normal by almost a half degree. In consequence the heat transport 

 was almost twice the normal value. 



Figures 33, 34, and 35 show, respectively, the dynamic topog- 

 raphy of the sea surface in the vicinity of the section across the 

 Labrador Sea, and the temperature and salinity distribution 

 along that section. The West Greenland Current past this section 

 was computed to have a volume transport of 8.36, a mean tem- 

 perature of 4.48 and a heat transport of 37.40. On the assumption 

 of this current being made up of an East Greenland Current com- 

 ponent of constant mean temperature of 3.2 and an Irminger 

 Current of constant mean temperature of 5.5, these components 

 were computed to have had volume transports of 3.73 and 4.63 

 as compared with their respective seasonal normals of 2.45 and 

 2.41. The heat transport found (37.40) is 16.3 greater than the 

 seasonal normal of 21.1. 



55 



