NO. 4 TEMPERATUBE VARIATIONS IN THE NORTH ATLANTIC 65 



1902 and 1906 to 1908. These features appear very distinctly in 

 most of the curves compared both in figure 21 and in figure 22. In 

 the latter maximum period 1906 to 1908, the temperature was on 

 the whole considerably higher than in the earlier period of 1902, 

 not only in February but also in March-April. This, however, was 

 not the case for the average temperatures for the twelve southern 

 fields (see fig. 29, curve III) where the temperature of the last 

 maximum period was lower than that of the first maximum period 

 of 1902. This was yet more marked in the most southeasterly fields 

 between 10° and 20° west longitude and particularly between 37° 

 and 39° north latitude, as shown in figure 28. A similar depression 

 of temperature from the first to the last maximum period finds 

 representation in the curves for the 10° longitude fields of the 

 Danish observations northerly of 50° north latitude between 20° 

 and 40° west longitude (see figs. 31 and 32). 



As already remarked, the results for the regions of the sea near- 

 est to the continental coasts on both sides of the ocean indicate that 

 the continents influence the variations of the surface temperatures 

 of those regions of the ocean adjacent to them. It may therefore 

 be better to omit all these fields between 10° and 20° west longitude 

 and between 60° and 70° west longitude in determining the mean 

 value of the variations from year to year of the surface tempera- 

 tures of the coldest part of the year representative of the Northern 

 Atlantic Ocean. 



Table 2-W gives the anomalies for the average temperatures 

 which we obtain in this way for the four middle 10° fields between 

 20° and 60° west longitude of the northern region. These are 

 given for both decade groups separately as well as combined, and 

 ire represented in figure 49 in the curves marked W. 



Table 3-W, as well as curve S in figure 30, give the anomalies o'f 

 the average temperatures for February for the eight 10° fields 

 between 20° and 40° west longitude of the southern region. 



The upper full curve N of figure 30 represents the anomalies of 

 the average temperatures for February for the four 10° fields 

 between 20° and 60° west longitude of the stretch of the ocean from 

 the Channel to New York, while the dotted curve gives the cor- 

 responding temperatures for the two 10° longitude fields between 

 20° and 40° of west longitude, which therefore correspond in 

 longitude to the eight southerly fields whose temperature anomalies 

 are shown in curve S. We notice that the agreement between the 

 curves for these southerly fields and for the northerly fields is 

 extraordinarily close. 



