NO. 4 TEMPERATURE VARIATIONS IN THE NORTH ATLANTIC 



75 



also a certain similarity with the February curves especially in 

 our io° longitude fields between 20° and 50° west longitude, shown 

 in figures 20 and 30, where we find the maximum in the year 1901 

 at a temperature sinking gradually from this time on toward 1903. 

 However, the tropical curves show no minimum in the year 1899, 

 although there seems to be a tendency in both curves towards a 



J900 1 2 3 'f 5 e 7 



9 10 11 12 a 



"^ PORTO RICO 

 25-7° 



jA.\-Psci-o-5 



1900 1 



10 11 (? 13 



Figure 39. Curves for the surface temperatures (in the year and in 

 February and March), for the Dutch 10° squares from 5° to 15° north and 

 from 15° to 25° north. The temperature anomalies for our fields A and B 

 and the air temperature for the year at San Juan (Porto Rico). 



lower temperature in this year. This comes most strongly to view 

 in the curves for February, and the March curves have minima in 

 the year 1899. It may be remarked as we have earlier said thai 

 Liepe's two tropical stations, 7 and 8, are near the middle of the 

 Atlantic Ocean, as are also our fields between 20° and 50° west 

 longitude and between 37° and 50° north latitude. The distance 



