surface locations of near-surface water mass boundaries that were crossed during certain 

 of the runs. The XBT measurements were made from the USNS S.P. LEE, USNS DE 

 STEIGUER, and the RV CAPE, with three different XBT systems. The XBT profiles by the 

 LEE were made along the tracks shown in figure 3, while the DE STEIGUER and CAPE 

 measurements were made with the vessel hove to and drifting during the propagation loss 

 runs. Additional measurements were made in transit between the experimental areas and 

 San Diego, and between the experimental areas themselves. Table 2 Hsts the number of 

 XBT profiles attempted, as well as the number of hydrocasts and STD/SV profiles made by the 

 three participating ships. The LEE STD/SV profiles were made by means of a Plessey 

 Environmental Systems 90404C STD/SV profiling system; the DE STEIGUER profiles 

 were obtained with a Ramsey Engineering Company SVTP MK-I system. 





Location 



Time Interval 



1 



""Jumber of Profiles 



Ship 



XBT 



Hydrocast 



STD/SV 



LEE 



Area A 



8-12 February 



89 



3 



5 





In transit 



13-14 February 



18 



1 



1 





AreaB 



14-16 February 



63 



- 



- 





In transit 



16-19 February 



16 



- 



1 





AreaC 



19-23 February 



111 



2 



5 





In transit 



23-24 February 



21 



- 



- 



DE STEIGUER 



In transit 



7-8 February 



3 



_ 



_ 





Area A 



8-13 February 



60 



1 



1 





In transit 



13-14 February 



15 



1 



- 





AreaB 



14-16 February 



20 



- 



1 





In transit 



16-18 February 



5 



- 



- 





AreaC 



18-23 February 



59 



3 



3 





In transit 



23-24 February 



23 



- 



- 



CAPE 



Area A 



9-13 February 



36 



_ 



_ 





In transit 



13-14 February 



10 



- 



— 





Area B 



14-16 February 



17 



- 



- 





In transit 



16 February 



2 



- 



— 





AreaC 



19-23 February 



45 



- 



- 



TOTALS 163 



17 



Table 2. SUDS 1-1972 measurements. 



In addition to the hydrocast and the STD/SV measurements, the LEE also measured 

 temperature during all propagation loss runs by means of a towed thermistor chain. This 

 system measures temperature, from the surface to 242 m, at 44 depths spaced 5.6 m apart 

 every 10 s,with a resolution of 0.03°C and an estimated accuracy of 0.1°C. Since the system 

 measures a temperature profile every 1 s, simultaneous XBT and thermistor chain measure- 

 ments were obtained. On 23 February 1972, with the thermistor chain vertical in the 

 water (zero tow speed), five XBT profiles were obtained. In addition, during the propaga- 

 tion loss runs, the LEE, towing the thermistor chain at 3 knots, made 153 XBT temperature 

 profiles. These two data sets provide measurements for special accuracy studies. 



