INSTRUMENTATION AND METHODS 



International Ice Patrol Cruises 



Data from all 179 oceanographic stations taken 

 durinfr the three 1972 Ice Patrol cruises aboard 

 CGC EVERGKEEN were obtained using a 

 Plessey Environmental Systems, Model 9040, 

 S/T/D Environmental Profiling System (STD). 

 The Plessey Environmental Systems, Model 

 8114A, Digital Data Logger (DDL) was used 

 to record these data on magnetic tape. However, 

 as CGC EVERGREEN did not have the on 

 board computer capability to process DDL tapes, 

 it was necessary to read the STD analog traces 

 and to transmit the data including quality 

 control temperatures and salinities to CG 

 OCEAXOU for real-time processing. This pro- 

 cessing was accomplished with a Honeywell 

 DDP-516 computer utilizing the programs de- 

 scribed by Hislop (1973). Following the Ice 

 Patrol season, the DDL tapes were processed on 

 the Control Data Corporation (CDC) 3300 com- 

 puter using the procedures described by Rose- 

 brook (1974). 



A Niskin bottle, equipped with two protected 

 and two unprotected deep sea reversing ther- 

 mometers, was attached immediately above the 

 underwater sensing unit on all deep stations for 



quality control. Conductivity ratios of these 

 samples were determined on board CGC EVER- 

 GREEN using a portable inductive salinometer 

 and were converted to salinities using formulae 

 published in the International Oceanographic 

 Tables (1966). Temjieratures were also processed 

 on board CGC EVERGREEN with a Dietzgen 

 Model 7410-PA programmable calculator with 

 programs developed at CG OCEANOU. Dy- 

 namic heights in shallow water were calculated 

 using the modified Helland-Hansen method de- 

 scribed by Kollmeyer et al., (1967). 



Occupation of Standard Sections 



Data from the 12 occupations of standard sec- 

 tions A1-A4 I'eported here were obtained from 

 either STD or Nansen casts depending on how 

 each ship was outfitted. The cast procedures 

 outlined in the Manual for Oceanographic Op- 

 erations (CG-410) were followed during these 

 occupations. Station data were processed using 

 conventional CG OCEANOU procedures. Ver- 

 tical temperature and salinity profiles for these 

 occupations are presented as Figures 2 through 

 24. Similar profiles for all IIP occupations of 

 A2, A3, and A4 are also presented (figs. 25 

 through 38). 



