



200 m 







300 m 







400 m 







n 



T 



s 



n 



T 



s 



n 



T 



s 



GULF OF ALASKA 





















Water mass 2 



65 



3.83 



0.04 



65 



3.73 



0.04 



65 



3.60 



0.04 



Transition water mass 



20 



4.10 



0.21 



20 



3.88 



0.09 



20 



3.74 



0.07 



Water mass 7 



8 



4.62 



0.67 



8 



4.09 



0.32 



8 



3.87 



0.20 



SUDS I 1972 





















Area A 



9 



10.26 



0.12 



8 



9.45 



0.19 



7 



8.31 



0.30 



AreaC 



10 



9.76 



0.19 



10 



7.87 



0.10 



10 



6.62 



0.09 



ORB-3 



4 



8.65 



0.08 



4 



7.40 



0.12 



4 



6.34 



0.04 



0RB4 



8 



9.26 



0.19 



7 



7.64 



0.14 



6 



6.44 



0.09 



CAPER 





















Water mass 1 



2 



9.38 



0.08 



2 



7.56 



0.06 



2 



6.09 



0.06 



Water mass 2 



15 



9.10 



0.16 



15 



7.47 



0.17 



15 



6.20 



0.12 



Water mass 3 



3 



9.91 



0.29 



3 



7.62 



0.18 



3 



6.22 



0.13 



RAPLOC/DEEPTOW 



11 



8.70 



0.12 



11 



7.22 



0.12 



11 



6.25 



0.04 



Table 13. Summary of average hydrocast and STD/SV 200-, 

 and 400-m temperatures. 



3 00-, 



Preliminary XBT System Errors 



Execution of steps 2 and 3 establishes the preliminary system errors. Table 14 

 lists, for each XBT system, the number of comparisons and the minimum and maximum 

 time in minutes between the XBT and hydrocast or STD/SV measurements. The prelim- 

 inary XBT system error is the average of the indicated number of differences. For those 

 systems where there were no comparisons, the preliminary system error was assumed 

 to be zero. Table 15 summarizes the average preliminary system errors and the standard 

 deviations from the average. The temperature difference is the average 200-, 300-, and 

 400-m difference between the hydrocast or STD/SV temperature and the XBT profile 

 temperatures. 



Final XBT System Errors 



Execution of step 4 establishes a 200-, 300-, and 400-m accuracy criterion for each 

 XBT system. Step 5 compares the 200-, 300-, and 400-m temperature for individual XBT 

 profiles with the appropriate accuracy criterion to determine whether the XBT temper- 

 ature satisfied the accuracy criterion. 



In step 6, the average 200-, 300-, and 400-m temperature for all XBT profiles that 

 satisfied the accuracy criterion at all three depths is computed for each XBT system. Finally, 

 in step 7, the average XBT temperatures are compared with the average hydrocast and/or 

 STD/SV temperatures listed in table 13 to establish a final average XBT system error. 

 These final system errors are listed in table 16. The system error is added algebraically to 

 all XBT profile temperatures to bring the XBT temperature into agreement with the hydro- 

 cast and STD/SV temperatures. Note that some of the system errors are substantial, varying 



27 



