UNCLASSIFIED 



Security Classification 



DOCUMENT CONTROL DATA - R&D 



(SteuHly elattllicalion of llUt, body of abstract and Indaxing annoiallc 



ilered when the overall report is ctassitied) 



1 ORIGINATIN G ACTIVITY rCof^oral* author) 



U.S. Naval Oceeuiographlc Office 

 Oceanographic Prediction Division 

 Washington, D.C. 20390 



REPORT SECURI TY CLASSIFICATION 



None 



2b GROUP 



n/a 



3 REPORT TITLE 



ON THE GENERATION AND DIRECTIONAL RECORDING OF WAVES IN THE ARCTIC OCEAN (U) 



~i DESCRIPTIVE NOTES (Type of report and inclusive dales) 



Exploratory Development 



S AUTHORfS; (Last name. Ural name, initial) 



LESCHACK, LEONARD A. 



6 REPO RT DATE 



S'-IIT. I96S 



7« TOTAL NO OF PAGES 

 kk 



7 b. NO OF REFS 



20 



8a CONTRACT on GRANT NO. 



n/a 



6. PHOJECT NO. HF-IO3-O8-O2 



c 636 (Ice Prediction) 



9a. ORIGINATOR'S REPORT NUMBERfS; 



TR-179 



None 



10 AVAILABILITY/LIMITATION NOTICES pjj^ dlstrltutlon of thls publlcatlon is controlled. 

 Qualified DDC users shall submit req,uests for copies to the: Commander, U.S. 

 Naval Oceanographic Office, Washington, D.C, 20390, ATTN: Code UOOO. 



SUPPLEMENTARY NOTES 



12 SPONSORING MILITARY ACTIVITY 



U.S. Naval Oceanographic Office 

 Washington, D.C. 20390 



iBSTRACT 



An experiment to investigate the directional nature and the possl'ble 

 generation mechanisms for waves on the Arctic Ocean, an ocean almost entirely 

 covered «ith sea ice, is described. The waves under consideration have periods 

 between 10 and 100 seconds and amplitudes between 0.001 and 2.0 centimeters. These 

 waves have been previously observed with gravimeters and seismographs and have 

 been described in the literature, (u) . 



In the present work an array of two continuously recording gravimeters l,2U0m 

 apart was established at drift station ARLIS II. The records obtained were exam- 

 ined by cross -spectrum analysis techniques. Observed waves with distinct periods 

 were associated with a storm over Siberia, (u) 



A continuously recording microbarograph sensitive to atmospheric nlcropressure 

 oscillations in the 10- to 100- second period range was also installed at ARLIS II. 

 Distinct oscillations were obsei-ved in this period range having amplitiide of froo 

 20 to 1+00 dynes/cm^. Power spectra of micropressure records made before, during, 

 and after a storm show that the oscillation amplitude is proportional to the period 

 3f the oscillation and speed of local winds. Cross correlation between the micro- 

 Lressure records and wave records taken with a gravlmeter at the same location as 

 tne microbarograph shows a positive correlation between the micropressure waves and 

 .'-ifc ocean waves. This correlation appears to vary with the direction of the local 

 surface wind and may be related to the orientation of pressure ridges in the ice 

 pack. Although the nature of the micropressure oscillations could not be 

 determined with only the one sensor used, the oscillations were assumed to 

 be progressive waves. These waves contained sufficient force to bend the 

 Lee and rjenerate the observed water waves (U). 



DD /:?N«'J. 1473 



UNCLASSIFIED 



Security Classification 



