BUCK: ARCTIC ENVIRONMENTAL LF ACOUSTICS MEASUREMENTS, 

 MODELS AND PLANS 



will be the most extensive and thorough ambient noise experiment ever 

 conducted in any ocean. 



Figure 23 shows the installation locations of ten "Arctic Environ- 

 mental Buoys" (AEB) being developed by PRL for NOAA. These are HF 

 telemetry stations for automatically collecting and telemetering to 

 one of four manned camps in the center of the ring. The ring will be 

 300 or 400 km in radius. These stations will collect temperature and 

 precise barometric pressure readings at the synoptic times every 

 3 hours for geostrophic wind calculations. Each is equipped with 

 TRANSIT satellite receivers that will automatically measure precise 

 location and enable ice strain measurements of the buoy field. Ex- 

 pected unattended AEB life is 16 months. 



At each AEB location, but separated by at least 1 mile, will be 

 a Synoptic Random Access Measurement Station (SYNRAMS) which PRL is 

 also developing. These will be used to collect temperature, baro- 

 metric pressure, and ambient noise level data in four 1/3-octave 

 bands (3.2, 10, 32, and 1000 Hz) at the synoptic times and transmit 

 them via the NIMBUS F satellite back to the CONUS. SYNRAMS has a 

 built-in navigational capability accurate to about 2 miles. 



Figure 24 shows the 1-year drift histories of U.S. and U.S.S.R. 

 manned camps and ships and can be used to estimate the distribution 

 of the 15 SYNRAMS after their life goal of 2 years. 



Figure 2 5 shows the predicted SYNRAMS locations at the end of 

 their battery life in 1977 after having telemetered 6,000 synoptic 

 samplings of 1/3-octave levels, temperature, atmospheric pressure, 

 and location. By taking advantage of the ice drift, we can expect 

 to have buoys in parts of the Arctic where we have never been able to 

 have manned camps, and a well distributed field which, together with 



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