conducted at location B and three at location A. The solid lines indicate the boundaries of 

 a transitional water mass separating two distinct water masses designated as water mass 2 

 and water mass 7. These two water masses are homogeneous with respect to oceanic 

 parameters such as temperature, sahnity, or sound speed. The purpose of the environmental 

 surveys was to delineate the location of the boundaries of the transitional water mass in the 

 vicinity of the experiments made at locations A and B. Table 1 lists the experimental 

 period, time interval, the number of XBT profiles attempted, and the number of hydrocast 

 and STD/SV profiles. The XBT measurements were obtained when the same XBT system 

 was used. The STD/SV profiles during environmental survey 2 and acoustic experiment A3 

 were made by means of a Ramsey Engineering Company SVTP MKT system. The remainder 

 of the STD/SV profiles were made with a Plessey Environmental Systems 9040^C profiling 

 system. Surface temperatures were recorded continuously at Al , A2, A3, and during both 

 environmental surveys, when a towed thermistor was used. 





Time 

 Interval 





Number of Profiles 





Location 



XBT 



Hydrocast 



STD/SV 



In transit 



5-14 May 



31 



- 



- 



Bl 



18-22 May 



33 



1 



5 



B2 



26 May-6 June 



31 



- 



5 



ESI 



10-16 June 



159 



- 



29 



Al 



18-25 June 



44 



1 



30 



A2 



1-7 July 



44 



1 



21 



ES2 



7-9 July 



93 



- 



10 



A3 



16-21 July 



50 



- 



14 



In transit 



26-27 July 



5 



- 



- 



ABLE 



27-29 July 



11 



1 



- 



In transit 



29-31 July 



11 



- 



- 



CHARLIE 



31 July-2 Aug 



16 



2 



- 



In transit 



2-4 August 



11 



- 



- 



PAPA 



4-7 August 



31 



2 



- 



In transit 



7-16 August 



56 



- 



- 



TOTALS 626 



114 



SUDS I 1972 



Table 1. Gulf of Alaska measurements. 



The SUDS* I 1972 XBT measurements were made at three locations off the coast 

 of Southern California during 18 propagation loss runs (ref 7). The locations of these 

 propagation loss runs are shown in figure 3 by the solid lines. The dashed lines show the 



*SUrface Duct Sonar measurements 



7. Naval Undersea Center TP 465 , v I-V, Surface-Duct Sonar Measurements [SUDS 1-1972): Oceano- 

 graphic Measurements, by E.R. Anderson, February 1976. 



