Figures 47 and 48 are facsimiles of two of the area C profiles that were transmitted 

 to the FNWC during the SUDS I experiments. Shown in the inset are the 200-, 300-, and 

 400-m temperatures (T) and the difference between these temperatures as well as the 

 average hydrocast and STD/SV temperatures (AT). Figure 47 is a facsimile of XBT 97D 

 taken in area C on 19 February 1972 at 0400 PST and satisfying the 200-, 300-, and 400-m 

 accuracy criteria. Figure 48 is a facsimile of XBT 128D, which was taken in area C on 

 21 February 1972 at 2200 PST and does not satisfy the 200-, 300-, and 400-m accuracy 

 criteria. At 200-, 300-, and 400-m, the XBT temperatures were 1 .09°C, 0.37°C, and 0.70°C 

 higher than the average hydrocast and STD/SV temperatures. The 200-300-m temperature 

 gradient bias is -0.72°C, and the 300-400-m temperature gradient bias is +0.33°C. These 

 temperature biases convert to sound speed gradient biases of about -2.2 and +1.0m/s/100m, 

 respectively. 



In conclusion, if this sample of 13 XBT profiles is representative of the data being 

 transmitted to FNWC on a routine basis, the inclusion of many visually acceptable but 

 actually erroneous measurements must certainly have an adverse effect on the accuracy 

 of the acoustic predictions based on these measurements as inputs to the predictions. 

 Certainly, some procedure or technique of detecting such measurements prior to their 

 use as inputs to predictions is required. 



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