During the SUDS 1 experiments, temperature accuracy checks were obtained on six 

 hydrocasts and at maximum depth on two STD/SV profiles. Tables 9 and 10 summarize 

 the results of a comparison between temperatures measured at depths greater than or equal 

 to 2000 m by the STD/SV system and the hydrocast. An inspection of these data shows 

 that for depths greater than or equal to 2000 m, the STD/SV gives temperatures that are 

 consistently lower than the hydrocast temperature measurements. The average difference 

 for the differences tabulated in tables 9 and 10 is -0.02°C. It is concluded that the SUDS I 

 STD/SV system error is 0.02°C. 



Depth, 

 m 



Differences, °C 



(STD/SV - Hydrocast) 



+0h5Qmin 



+gh5Qmin 



2000 



-0.05 





-0.05 



2500 



-0.01 





0.00 



3000 



+0.01 





-0.02 



3500 



-0.01 





-0.02 



Table 9. Comparison of SUDS I STD/SV and 

 hydrocast temperature measurements. 



STD/SV 





Temperature, °C 







Depth, 





Reversing 





Number 



in 



STD/SV 



Thermometer 



Difference 



8a 



2045 



2.04 



2.05 

 2.06 

 2.05 



-0.01 

 -0.02 

 -0.01 



11 



3789 



1.50 



1.52 

 1.54 

 1.53 



-0.02 

 -0.04 

 -0.03 



Table 10. Comparison of SUDS I STD/SV and reversing thermometer 

 temperatures at maximum depth. 



The original CAPER plan included several quasisimultaneous CTD/SV profiles 

 and hydrocast measurements. Because of the failure of the CTD/SV depth sensor, only 

 one set was obtained - hydrocast 1 and CTD/SV 25, taken 5 h 55 min apart in time (see 

 reference 10 for a detailed analysis of the CAPER CTD/SV measurements). 



Table 1 1 compares, for depths greater than 1200 m, these two sets of measurements. 

 At all depths, the CTD/SV temperature measurement was less than the hydrocast measure- 

 ment. For three of the depths greater than 1 200 m, where time and space variations were 

 small, the CTD/SV temperature was 0.02°C lower than the hydrocast temperature, while 

 for one depth it was 0.06°C less. During the SUDS I experiments (reference 7), the same 

 CTD/SV temperature sensor was used. As noted above, the SUDS I STD/SV temperatures 

 were also 0.02°C lower than the hydrocast temperatures. It is concluded that the CAPER 

 CTD/.SV system error is 0.02°C. 



23 



