NO. 15 



WEATHER AND SOLAR ACTIVITY CLAYTON 



Exner, Walker, Groissmayr, Nansen, Memery, and others have given 

 instances of correlation in weather in widely separated areas even in 

 opposite hemispheres. De Geer finds these widespread correlations as 

 far back as the glacial epoch, and White's researches suggest them even 

 at an earlier period. 



It is evident that there is something in common in the weather in 

 widely separated parts of the earth, even in countries on opix)site sides 

 of the earth, as is shown in figure 2 in a comparison between the 



4. — Annual means of pressure at widely separated tropical stations and 

 smoothed means of several years, showing similarity of changes. 



rainfall in the United States and in Australia. In fact, the weather 

 changes are in some way related to each other over the entire world, 

 as will be more fully seen from what follows. 



In figure 4 the annual departures from normal pressure are plotted 

 for three widely separated tropical stations, namely, Quixeramobim, 

 Brazil ; Antananarivo, Madagascar ; and Colombo, Ceylon. The de- 

 partures from 42-year normals are given in table i, columns (4), 

 (5), (6), and (7). The data for Quixeramobim were extended back- 

 ward to 1889 by comparison with Recife. The oscillations of the an- 

 nual pressures at these three stations show a similar pattern. More- 



