Large-Scale Features 



29 



water masses present in the North Atlantic Ocean. A more comprehensive 

 and detailed study of the area can be found in the earlier monograph by 

 IseUn (1936). Inasmuch as the subject of the present book is hmited to the 

 Gulf Stream System itself, it would probably be too much of a digression 

 to try to discuss in detail the features of the entire North Atlantic Ocean. 

 Therefore, the description given here is very brief. The reader who is 

 interested in further detail is referred to Iselin (1936) and to the magni- 

 ficent oceanographic atlases pubUshed in the scientific reports of the 



Fig. 8. Plot of temperature versus salinity of selected station data from the 

 North Atlantic, according to Sverdrup, Johnson, and Fleming (1942, fig. 183). 

 A = Atlantis; AH.— Armauer Hansen; G — General Greene; M = Meteor; 

 N.A. = North Atlantic Central Region; M.W. = Mediterranean Water. 



German Meteor Expedition. Albert Defant's study (1941) is one of the 

 reports in this series. The two great atlases are Band 5 — Atlas (Bohnecke, 

 1936) and Band 6— Atlas (Wiist and Defant, 1936). 



The standard procedure used in water-mass analysis is to plot the hydro- 

 graphic data from a number of representative soundings on a graph in 

 which the coordinates are temperature and salinity. This graph is custo- 

 marily called a T-S diagram. Fig. 8, from Sverdrup et al. (1942, fig. 183), 

 shows the T-S diagram for a number of specially selected stations in the 

 North Atlantic Ocean. Observations from the upper 100 m. have been 



