64 



MARION AND GENERAL GREENE EXPEDITIONS 



to have assisted salty water downward to depths of 1.200 and 1,500 

 meters at Meteor''s station 120, prior, however, to the time of, and 

 upstream from the place of, the actual taking of the observations. 

 The depth of vertical convection farther offshore is discussed in 

 chapter VIII. 



No wintertime observations have ever been taken northward of 

 Cape Farewell in the west Greenland sector, but an indication of 

 the annual cycle is contained in the Ivigtut sections of the Marion 

 and Godthaab. The Marion ran the Ivigtut section the last few 

 days of August 1928, and the Godthaab repeated the survey the first 

 week in October (fig. 37). The close proximity of the two section? 

 in geographical position and the recorded constancy of the West 

 Greenland Current during the interval of about 5 weeks lend accu- 

 racy to a direct comparison between relative heat values as follows : 



Ivigtut section 



Date 



Volume of flow 



Average 

 tempera- 

 ture (°C.) 



Rate of 



heat 

 transfer 



Aug. 27-28, 1928. 

 Oct. 8-9, 1928—- 



7.4 m3/sec.X10«. 

 7.8m3/sec.X10. 



5.96 

 5.40 



44.1 

 42.1 



The rate of heat transfer of the West Greenland Current August 

 28 to October 9, 1928, without appreciable change of the volume 

 of flow diminished 2.0 million cubic meter degrees centigrade per 

 second in a period of about 5 weeks. This decline in the rate of 

 heat supply is attributed directly to the seasonal cooling of the 

 surface layers. 



A table recording in more detail the volume of the West Greenland 

 Current, previously depicted on the velocity profiles, and described 

 in this chapter is appended herewith. 



ife 



