average values were close to zero, varying from -0.024°C to 0.088°C, with nine differences 

 being positive and six differences negative. The standard deviations were small, varying 

 from0.07°C to0.13°C. 



Table 31 summarizes the number and percentage of the differences in profile sets I, 

 lA, and IB. An inspection of these statistics shows that from 28.8% to 58.7% of the differ- 

 ences were in profile set IB, the set of differences that did not satisfy the accuracy criterion. 

 For the set of all differences, the percentage was an increasing function of depth. It 

 increased from 36.7% at 200 m to 45.6% at 400 m. 



Depth, 



Set I 



SetIA 



Set IB 



m 



Number 



Number 



Percentage 



Number 



Percentage 



Gulf of Alaska, Water Mass 2 











200 



105 



68 



64.8 



37 



35.2 



300 



102 



70 



68.6 



32 



31.4 



400 



96 



64 



66.7 



32 



33.3 



Gulf of Alaska, Tr 



ansition Water M 



iss 









200 



109 



72 



66.1 



37 



33.9 



300 



100 



60 



60.0 



40 



40.0 



400 



96 



55 



57.3 



41 



42.7 



SUDS I 1972, Area C 











200 



186 



114 



61.3 



72 



38.7 



300 



182 



112 



61.5 



70 



38.5 



400 



176 



100 



56.8 



76 



43.2 



CAPER, Water Mj 



ss2 











200 



52 



37 



71.2 



15 



28.8 



300 



50 



28 



56.0 



T7 



44.0 



400 



46 



20 



43.5 



26 



56.5 



RAPLOC/DEEPT 



3W, at Anchor 











200 



107 



63 



58.9 



44 



41.1 



300 



106 



58 



54.7 



48 



45.3 



400 



104 



43 



41.3 



61 



58.7 



ALL DIFFERED 



:es 











200 



559 



354 



63.3 



205 



36.7 



300 



540 



328 



60.7 



212 



39.3 



400 



518 



282 



54.4 



236 



45.6 



Table 31 . Number and percentage of differences in profile sets I, lA, and IB. 



In summary, this analysis supports the preliminary conclusion that, unless biasing 

 profiles are detected and removed from the profile set, on the average the XBT system 

 records temperatures over the 200-to-400-m depth interval that are slightly higher, and 



68 



