vertical temperature gradients tliat are slightly larger, than those recorded by average 

 hydrocast and STD/SV measurements made in the same water masses as the XBT profiles. 



Of the 559 set I profiles reaching 200 m, 5 18 (92.7%) also reached 400 m. This 

 question might be asked: Out of these 518 profiles, how many satisfied the 200-, 300-, and 

 400-m accuracy criteria at all three depths, at one depth, at two depths, and at none of the 

 three depths? Table 32 summarizes these data. Shown for each water mass is the number 

 of XBT profiles that satisfied the accuracy criteria at one, two, and three depths. Shown 

 also are the total number and the percentage the total represents of the complete subset. 

 Four points are of special interest: 



a. Only 37.8% of the XBT profiles satisfied the accuracy criteria at all 

 three depths. 



b. 19.9% of the XBT profiles failed to satisfy the accuracy criteria at all 

 three depths. 



c. Of 126 profiles failing the accuracy criterion at one depth, the per- 

 centage failing the accuracy criteria at 200-, 300-, or 400-m was 32.5, 

 19.1 , and 48.4, respectively. 



d. Of 93 profiles that satisfied the accuracy criterion at one depth (failed 

 the accuracy criteria at two depths), the percentage that satisfied the 

 accuracy criteria at 200, 300, and 400 m was 51.6, 22.6, and 25.8, 

 respectively. 



Number XBT Profiles Rejected at: 





Depths 



1 Depth 



2 



Depths 



3 Depths 





n % 



n % 



n 



% 



n % 



GULF OF ALASKA 













Water Mass 2 



55 57.3 



14 14.6 



8 



8.3 



19 19.8 



Transition 



47 49.0 



12 12.5 



10 



10.4 



27 28.1 



SUDS I 1972 













Area C 



59 33.5 



50 28.4 



38 



21.6 



29 16.5 



CAPER 













Water Mass 2 



14 30.4 



12 26.1 



14 



30.4 



6 13.0 



RAPLOC/DEEPTOW 













at Anchor 



21 20.2 



38 36.5 



23 



22.1 



22 21.2 



TOTAL 



196 37.8 



126 24.3 



93 



18.0 



103 19.9 



Table 32. Accuracy summary for 5 18 profile set I profiles reaching 400 m. 



69 



