/ // I ^N \ 





h, 





NOVOSIBIRSKIYE OSTROVA 



^N^- II I I ! 



x^ "~^^<!v I ' I /' '/ 



^''' '/■ \ / 



■/•jARUS Tl . 





FIGURE 10 ARLIS II pack ice gravimeter array, 3 June 1961— Some computed wove paths on 

 plotted. Depth contours in fathoms. 



where = — >-— sin a (the phase difference) 



D = distance separating instruments (l,24oni) 

 X = wave length 



It can he seen that the same phase difference can he obtained by waves 

 coming at an angle a as well as l80° - a , The former value has been chosen 

 as the most likely wave direction. 



There is also another ambiguity inherent in the 2-element array when the 

 observed waves are so short that the phase angle exceeds l8o°. Only the 

 principal value of ^, i.e., between + it can be estimated. Its true va].ue may 

 actually be any additional multiple of 2 7r, and thus several values of the wave 

 direction a can be computed according to 



sin a. = (0 + 2 7rj)/(2_7rD) (l4J 



\ 

 where J = 0, ±1, ±2,« • •, up to the largest value for which sin a. still lies 

 between ±1. 



22 



