g. Comparison of simultaneous XBT measurements. 



h. Analysis of the accuracy of a set of XBT profiles digitized and 

 transmitted to the Fleet Numerical Weather Center for operational use. 



This report also includes a discussion of the accuracy of a limited number of 1830-m 

 XBT profiles. 



For the reader who is not interested in the statistical details of the above studies, 

 the summary near the end of the report provides a detailed and complete resume' of the 

 main text of the report. 



DATA BASE 



Expendable bathythermograph (XBT) temperature profiles, together with 

 supporting hydrocast, STD/SV or CTD/SV, SVTP, thermistor chain, towed thermistor, 

 and/or bucket thermometer temperature measurements, were made during the following 

 acoustic experiments: 



a. Gulf of Alaska: 5 May- 16 August 1971. 



b. SUDS I: 8-24 February 1972. 



c. ORB-3: 12-18 December 1972. 



d. ORB^: 15-21 February 1973. 



e. CAPER: 18-31 August 1974. 



f. RAPLOC/DEEPTOW: I 7-28 October 1975. 



The general locations of these sets of measurements are shown in figure 1. 



