management provided by the University of Washington. Par- 

 ticipating U.S. institutions include the University of Alaska, Oregon 

 State University, Lamont-Doherty Geological Observatory, USGS, 

 and the Cold Regions Research and Engineering Laboratory of COE. 

 Participating Canadian institutions include the Bedford 

 Oceanographic Institute, McGill University, and the Department of 

 the Environment. ONR provides partial support for research efforts, 

 and through the Naval Arctic Research Laboratory, logistic support 

 for the field program. NASA, USGS, and NAVOCEANO provide 

 aircraft and equipment to the remote sensing effort. NOAA 

 participates with the development of automatic data buoy systems. 

 The USGS provides communications support. 



The major goal of AIDJEX is to find a quantitative relationship 

 between large-scale stress and strain fields in sea ice. Given such a 

 relationship and suitable methods of finding the external stresses 

 from wind and water currents, an estimate of stress in the ice 

 velocity can be determined. The AIDJEX modeling team is devising a 

 computer model for a limited portion of the Arctic Basin to assist 

 them in attaining the program goal. 



In addition to the ground data acquisition system, airborne remote 

 sensing will be conducted over the AIDJEX array with the use of 

 NASA and Navy fixed-wing aircraft and specially configured 

 helicopters of the USGS. Imagery of the Beaufort Sea site will also be 

 obtained by Landsat. These data, combined with the surface data, 

 will be fed into a central computer system and subsequently used by 

 the AIDJEX modeling group. This group will have a scale model of 

 the sea ice for use by the time data from the main experiment are 

 available. 



Cold-weather research is also being conducted by the Navy in the 

 ice-covered Arctic Ocean and its marginal seas. This effort, designed 

 to improve understanding of ice dynamics, acoustic propagation, 

 and related environmental factors, enables development of predic- 

 tion models. An important part of the program is the evaluation, 

 development, and application of remote sensing systems to Arctic 

 environmental measurements. 



Prediction of the acoustic character of the ocean is critical to the 

 Navy because acoustics affect the performance of many weapons 

 and detection systems used in antisubmarine warfare. During 1974, 

 interpretation of acoustic volume reverberation data previously 

 gathered in the Mediterranean was completed, and reports on 

 various aspects of the program were written by the Navy. A new 

 data collection and processing technique has enabled volume 

 scattering strength-versus-depth profiles to be obtained from data 

 collected with explosive sources and omnidirectional hydroplanes. 

 A computer prediction program was developed to calculate volume 



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