





Temperature, °C 







Depth, 

 m 



ORB-3 



RAPLOC/DEEPTOW 



System A 



System B 



Difference 



System A 



System B 



Difference 







16.16 



16.13 



0.03 



17.10 



17.05 



0.05 



10 



16.19 



16.13 



0.06 



17.06 



17.01 



0.05 



20 



16.22 



16.14 



0.08 



17.05 



16.98 



0.07 



30 



16.23 



16.17 



0.06 



17.01 



16.95 



0.06 



50 



16.17 



16.15 



0.02 



15.68 



15.68 



0.00 



75 



12.56 



12.40 



0.16 



12.45 



12.36 



0.09 



100 



10.99 



10.97 



0.02 



11.08 



10.98 



0.10 



125 



10.20 



10.15 



0.05 



10.12 



10.11 



0.01 



150 



9.73 



9.63 



0.10 



9.44 



9.46 



-0.02 



200 



8.90 



8.85 



0.05 



8.69 



8.69 



0.00 



250 



8.23 



8.16 



0.07 



8.04 



8.07 



-0.03 



300 



7.58 



7.60 



-0.02 



7.18 



7.17 



0.01 



400 



6.43 



6.42 



0.01 



6.12 



6.13 



-0.01 



Layer 















depth 



57 



58 



-1 



38 



37 



1 



Table 45. Comparison of XBT pairs satisfying the accuracy specification for comparisons 

 above and below the thermocline. 



SIMULTANEOUS 1830-m AND 460-m XBT PROFILES 



During the RAPLOC/DEEPTOW experiments, 1830-m XBT profiles were obtained 

 simultaneously with 460-m profiles taken on two different 460-m systems. This section 

 compares the 1830-m profiles (system C) with the 460-m profiles (systems A and B). 

 During the experiment, 18 sets of simultaneous profiles were attempted. Of the 18 system C 

 profiles, seven failed catastrophically; the calibration correction for one exceeded 0.34°C 

 and therefore was not used. This left 10 system C visually acceptable XBT profiles taken 

 simultaneously with 10 system A and 10 system B profiles. All profiles were made from the 

 ORB at anchor. Comparisons are made at standard hydrocast depths. 



The temperature and layer depth differences for system C versus system A and 

 for system C versus system B are presented in tables 46 and 47, respectively. The asterisk 

 after the XBT profile pair number indicates pairs which agreed to within ±0.34°C for all 

 above- and below-thermocline depths. Of a total of 20 comparisons, 15 (75.0%) pairs met 

 the accuracy criteria at all above and below thermocline depths. For 17 pairs, the layer 

 depth differences were less than or equal to ±5 m. 



Of a total of 238 comparisons, 143 (60.0%) differences were negative and 88 (37.0%) 

 were positive. This means that system C measured temperatures that were lower than those 

 measured by systems A and B. Table 48 lists pertinent statistics for the above-, in-, and 

 below-thermocline subsets of differences, as well as statistics for the set of all differences. 



117 



