the author hoped to correlate periodic pressure variations, if any, in the 

 period range 10 to 100 seconds vith the observed wave motion. In addition, 

 a second gravinieter, a portable model, was located l,2toni from the primary 

 gravineter, so that a study of phase relationships of the waves could be 

 made. Although the meters were operated simultaneously in this way for only 

 a short interval, it was felt that much insight into the natiire of these waves 

 could be gained from the data. 



2. DJSTRUMENTATION 



a. Site 



All wave measurements were made at ARLIS II (figure 1), an arctic 

 drift station operated by the Office of Naval Research's Arctic Research 

 Laboratory at Barrow, Alaska. ARLIS II is a block of glacial ice which orig- 

 inated from an Ellesmere Ice Shelf and became entrapped in the constantly 

 moving pack ice of the Arctic Ocean Basin (LeSchack, I961) , At the time of 

 these observations, its dimensions were 3km by 6.5km by about 20m in thick- 

 ness. The station, drifting slowly westward during early summer, moved from 

 a distance of 110 miles from Point Barrow to a distance of 180 miles during 

 the course of the observations. Water depth beneath the station varied from 

 150 to l,600m along the station's track (figure 2). 



FIGURE 2 Track of ARLIS II, May — July, 1961 



