Table 2. — Methods used by participating agencies for quality control of data collected on the Joint Investigation of the Southeastern 



Tropical Atlantic cruises. 



BCF' 



USCG 2 



BIOPESCA3 



Temperature 



Salinity 



STD J data compared with reversing 

 thermometers at top and bottom of 

 cast 



Performance of reversing ther- 

 mometers monitored on each cast 

 Values averaged if difference for pair 

 s0.03°C 



STD data compared with labora- 

 tory analysis of water samples col- 

 lected at top and bottom of cast. 



Samples analyzed in duplicate by 

 inductive salinometer 



STD data compared with reversing 

 thermometers on full bottle casts on 

 stations 



Performance of reversing ther- 

 mometers monitored on each cast 

 Values averaged if differences for 

 pair «0 04°C 



STD data compared with on-board 

 analysis of water samples from 

 Nansen casts on station 



Performance of reversing ther- 

 mometers monitored on each cast. 



Values averaged if difference for 

 pair s0 04 C 



Duplicate determinations of salinity 

 by inductive salinometer on shore. 



Sampling 

 depth 



STD compared with thermometric 

 depth. 



Monitored performance of protected 

 and unprotected thermometers and 

 reviewed L-Z curves. 



STD compared with thermometric 

 depth 



Monitored performance of protected 

 and unprotected thermometers and 

 reviewed L-Z curves. 



Monitored performance of protected 

 and unprotected reversing ther- 

 mometers and reviewed L-Z curves. 



Dissolved 

 oxygen 



Inorganic 

 phosphate 



Replicate titrations on first and last 

 sample from each station If first 

 replicates differed by more than 

 ±0.02 ml of titer, duplicates were 

 run on all samples Special precau- 

 tions were taken to reduce errors 

 caused by volatilization of iodine 



Standardized against known con- 

 centration of potassium di hydrogen 

 phosphate at beginning and end of 

 cruise. Single determination with 

 O2 PO4 relationship for quality con- 

 trol (Van Landingham. pers comm ) 



Replicate titrations of first and last 

 sample from each station If first 

 replicates differed by more than 

 02 ml of titer duplicates were run 

 on all samples Special precautions 

 were taken to reduce errors caused 

 by volatilization of iodine 



Standardized against known con- 

 centration of potassium dihydrogen 

 phosphate at beginning and end of 

 cruise Duplicate determination. 



Variable not measured 



Variable not measured 



'Bureau of Commercial Fisheries 



2 U S. Coast Guard 



3 Missao de Estudos Bioceanologicos e de Pescas de Angola 



4 Sahnity-temperature-depth recording systems 



The data 1 1 stout was reviewed by an ocean- 

 ographer/monitor, who examined the flagged 

 sigma-r anomalies to determine the source of error. 

 When in the monitor's judgment the depth, tempera- 

 ture, or salinity was of doubtful validity, the value was 

 flagged with the suffix "P". This flag was carried 

 through the process to the permanent file and final 

 listing. 



As a guide to judging, if the value retains a flag, a 

 decrease (with depth) of 0.05 sigma-f units was toler- 

 ated at depths between 100 and 300 m, and 0.2 from 

 the surface to 1 00 m. Values identified as being doubt- 

 ful by the originator were flagged with the suffix "O". 



When either temperature or salinity had been flagged, 



sigma-f also was flagged. 

 After the data were quality controlled and processed 



to the stage of archival by NODC, the observed values 

 of temperature, salinity, density, oxygen, and phos- 

 phate were plotted versus depth and contoured to 

 yield the vertical sections in this report. Data from the 

 Goa, Rockaway, and Undaunted 6802 were plotted 

 and contoured by a computer-controlled drafting 

 machine utilizing the Coast Guard Oceanographic 

 Unit's HYDROGRAPH computer program. The data 

 from Undaunted 6801 were plotted and contoured by 



