CONTENTS 



INTRODUCTION . . . page 1 

 DATA BASE ... 3 



Gulf of Alaska. . .5 



SUDS I 1972 .. .7 



ORB-3 and ORB-4 ... 10 



CAPER ... 12 



RAPLOC/DEEPTOW ... 14 

 SUMMARY ... 1 5 



SIPPICAN XBT CHARACTERISTICS AND OPERATIONAL 

 PROCEDURES ... 15 



XBT PERFORMANCE SUMMARY ... 16 



SYSTEM MEASUREMENT ERRORS ... 21 



STD/SV, CTD/SV, and SVTP System Errors ... 21 

 XBT System Errors ... 25 

 Thermistor Chain System Error ... 29 

 Towed Thermistor System Error ... 31 

 Mercury-In-Glass Thermometer Errors ... 32 

 Summary ... 35 



SURFACE TEMPERATURE ACCURACY OF 460-m SYSTEMS ... 36 



Comparison With Hydrocast ... 36 

 Comparison With STD/SV ... 36 

 Comparison With Thermistor Chain ... 37 

 Comparison With Towed Thermistor ... 42 

 Comparison With Bucket Thermometer ... 53 

 Summary ... 59 



TEMPERATURE ACCURACY OF 460-m SYSTEMS ... 63 



Comparison With Average Hydrocast and STD/SV Temperatures ... 63 

 Quasisimultaneous XBT and STD/SV Measurements ... 74 

 Comparison With Thermistor Chain Measurements ... 77 

 Summary ... 91 



DISCUSSION OF PROFILES WITH LARGE DIFFERENCES ... 93 



TEMPERATURE ACCURACY OF 1830-m SYSTEMS ... 96 



COMPARISON OF SIMULTANEOUS XBT MEASUREMENTS ... 103 



Simultaneous 460-m XBT Profiles ... 103 

 Simultaneous 1830-m and 460-m XBT Profiles ... 117 



ANALYSIS OF XBT PROFILES TRANSMITTED TO FLEET NUMERICAL 

 WEATHER CENTER FOR OPERATIONAL USE ... 121 



SUMMARY ... 126 



XBT Performance ... 126 



System Measurement Errors ... 126 



Surface Temperature Accuracy of 460-m Systems ... 127 



