NO. 4 TEMPERATURE VARIATIONS IN THE NORTH ATLANTIC 229 



sion into two of the eleven-year sun spot period, that the latter 

 of the two maxima is gradually, in the run of the months, developed 

 into a principal maximum, and falls several years later than the 

 maximum of sun spots, while the first maximum is in these months 

 about coincident with the sun spot maximum. 



mS fS90 /S9.'> 1900 



I 



m 



N 



L7 



vn 



m 



Figure 85. Yearly anomalies of the surface temperature at Liepe's stations 

 I to VIII in combined two-and three-year smoothing. S : sun spots two- and 

 three-year smoothing. P : anomalies of the air-pressure differences between 

 30° north 30° west and Sao Thiago in combined two- and three-year smoothing. 



HALVING OF THE ELEVEN-YEAR PERIOD AT LIEPE's STATIONS 



We see here also a similar halving of the eleven-year sun spot 

 period such as we found in the surface temperature of the North 

 Atlantic Ocean and at different meteorological stations (see figs. 69, 



