HOOE-I 

 ^ ^\ . STUDY AREA 



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•5° 10° W 70" 65' 10° 



Figure 8 The area where the MODE-1 

 Field Experiment took place is shown on a 

 physiographic diagram of the North Atlan- 

 tic Ocean. The region within 200 km otthe 

 center of the array contained 20 in- 

 strumental moorings and 20 drifting buoys. 



MODE-1— The MODE-1 field experiment 

 took place from March-July 1973. It will also 

 include limited extended measurements for a 

 period of one year. Five ships from the U.S. — 

 R/V Chain of Woods Hole Oceanographic 

 Institution, O.S.S. Researcher of NOAA's 

 Atlantic Oceanographic and Meteorological 

 Laboratory, R/V Trident of the University of 

 Rhode Island, R/V Eastward of Duke Univer- 

 sity and the R/V R. F. Hunt of Marine Acous- 

 tical Services — were joined by the R.R.S. 

 Discovery 11 from England's National Institute 

 of Oceanography. The ships conducted an 

 integrated program of standard measurements 

 of ocean temperature, salinity, and pressure 

 fields (Figure 9). 



The Moored Array — A fixed array of 

 moored instruments consisted of recording 

 current meters (about 94 on 24 moorings) and 

 temperature/pressure recording instruments 

 of new design. The current meters were con- 



centrated at four standard levels — 500, 800, 

 1500 and 3000 m — plus two deep levels, one 

 of which is 100 m above the sea floor of the 

 abyssal plain, and another at 4000 m in the 

 abyssal hill terrain. The array was designed 

 to help realize the following experimental 

 objectives: 



(1) pattern recognition over a circle of 350 

 km diameter; 



(2) accurate mapping in an inner circle of 

 200 km diameter; 



(3) thermocline, deep water and bottom 

 geostrophic balances; 



(4) precise float-flow intercomparison in the 

 inner circle; 



(5) information on the effects of interme- 

 diate scale rough topography on the 

 coupled vertical and horizontal struc- 

 tures of the large scale patterns; 



18 



