PATH OF THE CENTER 



OF THE CYCLONE 



Schemes of the drift of ice floes during the passage of a cyclone 

 with circular isobars and with a constant pressure gradient. 



DISTRIBUTION OF THE PRESSURE GRADIENT 

 FROM THE CENTER OF THE CYCLONE TOWARD 

 THE PERIPHERY 



PATH OF THE 



CENTER OF THE 

 CYCLONE 



Figure 137. Scheme of the drift of ice during 

 the passage of a circular cyclone 

 with pressure gradients changing 

 from the center toward the 

 periphery of the cyclone. 



circular, the pressure gradient constant. The curvature of the lines is shown for the moment when 

 the center of the cyclone, moving from left to right, reaches point 0. The curve A CB is the most 

 probable curvature of the line perpendicular to the path of the cyclone, after the passage of a 

 cyclone of given force and velocity. Figure 138 gives an idea of the direction and the strength of 

 the forces acting on the ice during the passage of the cyclone. At points where these lines con- 

 verge, we should expect hummocking; at points where they diverge we should expect scattering of 



An examination of the figures will show that despite complexities the drifts of the individual 

 ice floes during the passage of cyclones of various structure and moving at various speeds, do obey 

 certain laws, namely: 



1. The slower the movement of the cyclone, the more complex and the longer are the paths 

 described by the ice floes. 



378 



