Depth, 







Temperature, °C 







m 



System C 



System A 



Difference 



System C 



System B 



Difference 







17.05 



17.14 



-0.09 



17.04 



17.03 



0.01 



10 



17.01 



17.07 



-0.06 



17.00 



16.99 



0.01 



20 



16.93 



17.06 



-0.13 



16.91 



16.98 



-0.07 



30 



16.86 



17.04 



-0.18 



16.83 



16.98 



-0.15 



50 



16.19 



15.92 



0.27 



15.84 



15.78 



0.06 



75 



12.56 



12.56 



0.00 



12.48 



12.42 



0.06 



100 



11.10 



11.24 



-0.14 



11.14 



11.14 



0.00 



125 



10.18 



10.29 



-0.11 



10.19 



10.23 



-0.04 



150 



9.42 



9.54 



-0.12 



9.47 



9.53 



-0.06 



200 



8.64 



8.76 



-0.12 



8.71 



8.68 



0.03 



250 



7.97 



8.00 



-0.03 



7.95 



7.95 



0.00 



300 



7.32 



7.23 



0.09 



7.31 



7.20 



0.11 



400 



6.15 



6.21 



-0.06 



6.18 



6.16 



0.02 



Layer 















depth 



42 



40 



2 



41 



39 



2 



Table 49. Comparison of 1830-in and 460-m simultaneous RAPLOC/DEEPTOW XBT 

 pairs meeting the ±0.34°C accuracy specification for comparisons above 

 and below the thermocline. 



ANALYSIS OF XBT PROFILES TRANSMITTED TO FLEET NUMERICAL 

 WEATHER CENTER FOR OPERATIONAL USE 



During the SUDS I 1972 experiments, the DE STEIGUER routinely digitized and 

 transmitted XBT temperature data to the Fleet Numerical Weather Center (FNWC), 

 Monterey, CA. These measurements were used as inputs to FNWC synoptic predictions 

 of propagation loss and Fleet sonar performance. These operational predictions are used by 

 the Fleet in day-to-day operations. This section discusses the accuracy of the data trans- 

 mitted to FNWC. 



From 8-23 February 1972, the DE STEIGUER digitized and transmitted XBT 

 temperature measurements to the FNWC. During this period, 3 1 profiles were attempted 

 and three failed catastrophically. The remaining 28 were judged visually acceptable by the 

 observer prior to digitization and transmission. Of the 28 profiles 15 were made in area C, 

 where enough hydrocast and STD/SV measurements were made to establish an average 200-, 

 300-, and 400-m temperature. The following summarizes an analysis of the 200-, 300-, and 

 400-m temperatures in terms of the accuracy criteria established for area C* Prehminary 

 system error is replaced by the final system error. 



*See step 4 of the section. Procedure for Determining XBT System Error. 



121 



