NO. 4 TEMPERATURE VARIATIONS IN THE NORTH ATLANTIC 73 



we have given the curves for September and August of Liepe's 

 different stations. It is apparent that there is a great degree of 

 similarity between the curves each to each. They show a gradual 

 change from the north toward the south which indicates that they 

 actually represent the conditions fairly well. There is a good 

 similarity between the yearly curve for Liepe's station i, his Febru- 

 ary curve for the same station, the yearly curve for Petersen's 

 station i and the February curve for our most easterly field as 

 shown in figure 36. 



The similarity between the yearly curve for Liepe's station 3, his 

 February and March curves at the same station at 35° north latitude 

 and 13° west longitude, and our February curve for the correspond- 

 ing field which is a little further north between 37° and 38° north 

 latitude, and between 10° and 20° west longitude is also very good, 

 as shown in figure 38. 



The yearly curve for Liepe's station 2, at 42° north latitude 9° 

 west longitude, shown in figure 37, shows less similarity with the 

 February and March curves for the same station (see fig. 15), but 

 the February curve for the nearest of our fields, see figure 28 and 

 figure I, is more similar. Liepe's station 2 lies so near the coast 

 that the surface temperature of it is influenced by this proximity. 

 The agreement between the yearly curves and particularly the March 

 curves for stations 4 and 5 and the February curves for stations 

 6, 7, and 8 is also very good. 



SIMILARITY OF THE TEMPERATURE VARIATIONS OVER GREAT REGIONS 



OF THE OCEAN. DIFFERENCE BETWEEN EASTERLY AND 



MIDDLE PARTS OF THE NORTH ATLANTIC OCEAN 



The yearly curves for Liepe's stations, for Petersen's easterly 

 stations, and for the mo'st easterly Danish fields are very similar to 

 one another for the short time interval here examined, 1898 to 1903. 

 Liepe has published in his treatise of 191 1 the curves for all the 

 stations for the whole time 1883 to 1903. They show also for the 

 years before 1898 a great similarity each to each. We may there- 

 fore draw the conclusion that the variations in the yearly tempera- 

 tures over the whole eastern part of the North Atlantic Ocean from 

 60° north latitude to 30° north latitude (Liepe's station 4) or even 

 down to 18° north latitude (Liepe's station 6, fig. 37) are in their 

 principal features about the same. This is also confirmed by the 

 twelve-monthly consecutively smoothed temperature curves for dif- 

 ferent stations which we shall refer to later (see fig. 56). 

 6 



