TABLE 2 



NUMBER OF SEA SURFACE TEMPERATURE OBSERVATIONS 

 RECORDED BY REVERSING THERMO>ETERS 



Cruise 



DELTA I 

 DELTA II 

 DELTA III 

 DELTA IV 

 DELTA V 

 ECHO V 



Total Number 



Two 



Thermometers 



of Obs. 





Used 





No. 



Percent 



31 



1^ 



13 



72 



63 



88 



65 



^1 



72 



TT 



n 



100 



^9 



kk 



90 



58 



58 



100 



352 







ANALYSIS OF PAIRED BT DATA 



During two patrols to OWS DELTA and two to OWS ECHO, paired BT 

 observations were obtained by connecting two BT's together with brass 

 holders. An oceanographic winch was used at DELTA, and a BT winch 

 was used at ECHO. As indicated in table 3, 9 sets of data each con- 

 taining from 8 to 38 observations were made with paired BT's. After 

 routine processing by NODC, these observations were coded and punched 

 on IBM cards. 



As discussed by Bralove and Williams (reference 2), the extent 

 to which two temperature observations represent true ocean vari- 

 ability, as opposed to random errors of the two sensors, can be 

 estimated by computing the correlation coefficient, r. 



r = 



N 



I XjYi 

 i = l 



N N 

 -IXj lYj 



N 



N 2 



N 2 



N 



where 



x^ = reading of first instrument 

 Y± = reading of second instrument 

 N = number of observations 

 ^x = standard deviation of x^ 

 ^y = standard deviation of y^ 



As r approaches unity, variations in the readings of both in- 

 struments are a measure of the variations present in the ocean. If 

 the correlation is low, the variations of both instruments are re- 

 lated to the instrument bias, and conclusions concerning oceem veufi- 

 ability are limited. 



