of the 200-meter temperature structure used in the characteristic 

 component. 



Figures 2a and b are s/noptic current charts for the Pacific and 

 Atlantic, respectively, which have been drawn automatically on an 

 incremental x-y curveplotter. Each chart requires approximately 

 one minute to complete and is of sufficient quality that it can be 

 used immediately for radio-facsimile transmission. 



Figure 3 is a climatological current chart for winter. It can be 

 seen that many of the most important features are correctly depicted 

 in this approach both in location and intensity. 



The problem of automatic plotting of direction arrovv^s on these 

 charts has not yet been solved. However, a possible substitute 

 has been found and is now being programmed for numerical testing. 

 Since u and v current components are available in field form at all 

 grid points, it is believed a stream function field can be determined 

 by a relaxation solution of the Poisson equation 



8 V 8 u 



ax 8 y 



v2^ = (5) 



This would permit plotting of a second set of lines {^ ) which 



would everywhere parallel the direction of flow. 



7. VERIFICATION 



A synoptic current chart would be of little value if it could not 



be verified and the computational scheme tuned as required. Direct 



9 



