UNCLASSIKLED 



Security Classification 



DOCUMENT CONTROL DATA - R&D 



'(Security ctaaaitication ol title, body of abstract ar^d indexing annotation must be entered when the overall report is classilied) 



1 ORIGINATIN G ACTIVITY (Corporate author) 



U.S. Naval Oceanographic Office 

 Oceanographic Prediction Division 

 Washington^ D.C. 20390 



2s REPORT SECURITY C L ASS I F I C A T I ON 



None 



2b GROUP 



n/a 



3 REPORT TITLE 



QUANTITATIVE ANALYSIS OF SOME BATHyTHE3^0GRAPH ERRORS (U) 



4. DESCRIPTIVE NOTES (Type ol report and inclusive dates) 



Statistical 



5 AUTHORCSJ (Last name, first name, initial) 



HAZELWORTH, JOHN B. 



6 REPO RT DATE 



JANUARY 1966 



7a. TOTAL NO. OF PAGES 

 27 



7t> NO. or REFS 



7 



8a. CONTRACT OR GRANT NO. 



n/a 



b. PROJECT NO. HS-O32 



9a. ORIGINATOR'S REPORT NUMBERfSJ 



•m- 180 



9 6. OTHER REPORT NO(S) (A ny other numbers that may be assigned 

 this report) 



ASWEPS REPORT NO. 11 



10. AVAILABILITY/LIMITATION NOTICES ^2j_ distrlbution of tMs publlcation is controlled. 

 Qualified DDC users shall submit requests for copies to the: Commander, UoS. 

 Naval Oceanographic Office, Washington, D.C, 20390, ATTN: Code iKX)0. 



11 SUPPLEMENTARY NOTES 



12 SPONSORING MILITARY ACTIVITY 



U.S. Naval Oceanographic Office 

 Washington, D.C. 20390 



3 ABSTRACT ^ statlstical study of errors associated with the hathythermograph (BT) 

 has been made from data obtained during eight 3-week cruises to ocean weather sta= 

 tions (OWS) DELTA and ECHO. Simultaneous observations using reversing thermometers 

 bucket thermometers, and injection thermometers and nine sets of observations using 

 two connected BT»s were analyzed. BT instrument bias varies with depth as much as 

 lOp with maximum error occurring in the thermocline. One pair of BT's recorded 

 standard errors that varied from 0.20° to 0.61°? with depth and averaged CS^+^F- 



Mean differences between reversing thermometer reference temperatures and 

 BT. bucket, and injection thermometer temperatures were computed. Comparison of 

 these differences indicate that ship injection thermometers averaged l^F highj tne 

 BT's and bucket thermometers recorded sea surface temperature with approximately 

 the same degree of accuracy, averaging within 0.5°F of the reference temperature. 



At present, BT observations are processed by the National Oceanographic Data 

 Center without correcting for instrument bias. Comparisons between uncorrected 

 data and data containing a temperature correction factor (TCS) based on bucket 

 thermometer readings indicate that the correction factor increases the average 

 accuracy of the observation; however, the increase in accuracy is small. Accuracy 

 of several examples was decreased by correction. 



DD /.A°«'J. 1473 



UNCLASSIFIED 



Security Classification 



